| Initial Release | OTP 22.0 |
| Git Tag | OTP-22.0 |
| Date | 2019-05-14 |
| Issue Id | |
| System | OTP |
| Release | 22 |
| Application |
|
| Potential Incompatibilities |
Highlights #
- OTP-13397
-
- Application(s):
- erts
Add support for Erlang Distribution protocol to split the payload of large signals into several fragments. This allows other processes to communicate uninterrupted during the transmission of these signals.
- OTP-14831
-
- Application(s):
- erts, kernel
A simple socket API is provided through the socket module. This is a low level API that does *not* replace gen_[tcp|udp|sctp]. It is intended to *eventually* replace the inet driver, but not the high level gen-modules (gen_tcp, gen_udp and gen_sctp). It also provides a basic API that facilitates the implementation of other protocols, that is TCP, UDP and SCTP.
Known issues are; No support for the Windows OS (currently).
- OTP-14894
-
- Application(s):
- compiler
- Related Id(s):
- ERL-714
The compiler has been rewritten to internally use an intermediate representation based on Static Single Assignment (SSA). The new intermediate representation makes more optimizations possible.
Most noticeable is that the binary matching optimizations are now applicable in many more circumstances than before.
Another noticeable change is that type optimizations are now applied across local function calls, and will remove a lot more redundant type tests than before.
- OTP-15055
-
- Application(s):
- ssl
Use new logger API in ssl. Introduce log levels and verbose debug logging for SSL.
- OTP-15128
-
- Application(s):
- erts, stdlib
ETS option write_concurrency now also affects and improves the scalability of ordered_set tables. The implementation is based on a data structure called contention adapting search tree, where the lock granularity adapts to the actual amount of concurrency exploited by the applications in runtime.
- OTP-15439
-
- Application(s):
- erts
The length/1 BIF used to calculate the length of the list in one go without yielding, even if the list was very long. In OTP 22, length/1 will yield when called with long lists.
- OTP-15456
-
- Application(s):
- compiler
All compiler options that can be given in the source file can now also be given in the option list or from the command line for erlc.
Specifically, the option {nowarn_deprecated_function,MFAs} was only recognized when given in the file with the attribute -compile(). The option {nowarn_unused_function,FAs} was incorrectly documented to only work in a file, but it also worked when given in the option list.
- OTP-15483
-
- Application(s):
- ssl
- Related Id(s):
- ERL-924
Add new API function str_to_suite/1, cipher_suites/3 (list cipher suites as rfc or OpenSSL name strings) and suite_to_openssl_str/1
- OTP-15575
-
- Application(s):
- tools
The cover tool now uses the counters module instead of ets for updating the counters for how many times a line has been executed. By default, Cover will work with distributed nodes, but a new function cover:local_only/0 allows running the Cover in a restricted but faster local-only mode.
The increase in speed will vary depending on the type of code being cover-compiled, but as an example, the compiler test suite runs more than twice as fast with the new Cover.
- OTP-15591
-
- Application(s):
- ssl
Basic support for TLS 1.3 Server for experimental use. The client is not yet functional, for more information see the Standards Compliance chapter of the User's Guide.
- OTP-15596
-
- Application(s):
- erts, hipe, otp
In OTP 22, HiPE (the native code compiler) is not fully functional. The reasons for this are:
There are new BEAM instructions for binary matching that the HiPE native code compiler does not support.
The new optimizations in the Erlang compiler create new combination of instructions that HiPE currently does not handle correctly.
If erlc is invoked with the +native option, and if any of the new binary matching instructions are used, the compiler will issue a warning and produce a BEAM file without native code.
- OTP-15640
-
- Application(s):
- erts
Added the NIF function enif_term_type, which helps avoid long sequences of enif_is_xyz by returning the type of the given term. This is especially helpful for NIFs that serialize terms, such as JSON encoders, where it can improve both performance and readability.
- OTP-15644
-
*** POTENTIAL INCOMPATIBILITY ***
A new API is implemented in crypto. See the CRYPTO user's guide, chapter New and Old API for more information.
The old api with the crypto:block_* and crypto:stream_* interfaces are kept for compatibility, but implemented with the new api. Please note that since the error checking is more thorough, there might be arguments with for example faulty lengths that are no longer accepted.
- OTP-15655
-
The new hash_info/1 and cipher_info/1 functions returns maps with information about the hash or cipher in the argument.
- OTP-15691
-
- Application(s):
- snmp
- Related Id(s):
- ERIERL-324
[snmp|agent] Add a get-mechanism callback module (and a corresponding behaviour). The agent calls this module to handle each get (get, get-next and get-bulk) request.
- OTP-15715
-
- Application(s):
- compiler, erts
Internal documentation has now been added to the *Erts* and *Compiler* applications.
The internal documents for *Erts* describe miscellaneous interesting implementation details. Those details can change at any time.
The internal documentation for *Compiler* documents the API for the Core Erlang modules. While we will not change those APIs without good reason, we don't give the same guarantees about backward compatibility as for the rest of the APIs in OTP.
Potential Incompatibilities #
- OTP-14865
-
- Application(s):
- ssl
TLS-1.0, TLS-1.1 and DTLS-1.0 are now considered legacy and not supported by default
- OTP-15381
-
- Application(s):
- stdlib
The gen_* behaviours have been changed so that if logging of the last N messages through sys:log/2,3 is active for the server, this log is included in the terminate report.
To accomplish this the format of "System Events" as defined in the man page for sys has been clarified and cleaned up, a new function sys:get_log/1 has been added, and sys:get_debug/3 has been deprecated. Due to these changes, code that relies on the internal badly documented format of "System Events", need to be corrected.
- OTP-15563
-
Do not allow function specifications for functions residing in other modules.
- OTP-15571
-
- Application(s):
- reltool
A new element, Opts, can now be included in a rel tuple in the reltool release specific configuration format: {rel, Name, Vsn, RelApps, Opts}.
This supports the use of {rel, Name, Vsn, RelApps, [{load_dot_erlang, false}]} to prevent the boot script from running the .erlang file.
The incompatibilities are as follows:
* The return from reltool:get_config/1 and reltool:get_config/3 includes the new rel tuple for all releases where the load_dot_erlang option is set to false.
* The return from reltool:get_config/3 includes the new rel tuple for ALL releases if the InclDefs parameter is set to true. - OTP-15621
-
- Application(s):
- erl_interface, otp
The limited support for VxWorks is deprecated as of OTP 22, and will be removed in OTP 23.
- OTP-15622
-
- Application(s):
- erl_interface
The old legacy erl_interface library (functions with prefix erl_) is deprecated as of OTP 22, and will be removed in OTP 23. This does not apply to the ei library. Reasonably new gcc compilers will issue deprecation warnings. In order to disable these warnings, define the macro EI_NO_DEPR_WARN.
- OTP-15644
-
*** HIGHLIGHT ***
A new API is implemented in crypto. See the CRYPTO user's guide, chapter New and Old API for more information.
The old api with the crypto:block_* and crypto:stream_* interfaces are kept for compatibility, but implemented with the new api. Please note that since the error checking is more thorough, there might be arguments with for example faulty lengths that are no longer accepted.
- OTP-15677
-
- Application(s):
- crypto
Fixed a bug in error return for crypto:poly1305/2. It returned the atom notsup instead of the exception notsup.
- OTP-15678
-
- Application(s):
- crypto
The cipher chacha20 was introduced in OpenSSL 1.1.0. However, it could in a very odd situation, fail for versions less than OpenSSL 1.1.0d. It is therefore disabled for those versions.
- OTP-15692
-
- Application(s):
- kernel
- Related Id(s):
- PR-2170
In OTP-21.3, a warning was introduced for duplicated applications/keys in configuration. This warning would be displayed both when the configuration was given as a file on system start, and during runtime via application:set_env/1,2.
The warning is now changed to a badarg exception in application:set_env/1,2. If the faulty configuration is given in a configuration file on system start, the startup will fail.
- OTP-15712
-
- Application(s):
- erl_interface
- Related Id(s):
- OTP-15774
Added support to receive, decode, encode and send both bit strings and export funs (fun M:F/A).
New functions ei_decode_bitstring and ei_encode_bitstring have been added in order to decode and encode bit strings where the number of bits is not necessary divisible by 8 (a whole number of bytes). The existing functions ei_decode_fun and ei_encode_fun can now also handle export funs.
Before this change, bit strings and export funs sent to an erl_interface c-node were encoded using an undocumented fallback tuple format. For bit strings {Binary,BitsInLastByte} and for export funs {M,F}. Existing c-node implementations expecting these tuples must be changed to instead use ei_decode_bitstring and ei_decode_fun. As a temporary solution you can also build erl_interface with macro EI_COMPAT=21 or call ei_set_compat_rel(21) to receive the old fallback tuples.
- OTP-15774
-
- Application(s):
- jinterface
- Related Id(s):
- OTP-15712
Added support to receive export funs (fun M:F/A).
Before this change, export funs sent to a jinterface node were encoded using an undocumented fallback tuple format {M,F}. Existing jinterface implementations expecting these tuples must be changed to instead use the existing OtpErlangExternalFun class.
- OTP-15779
-
- Application(s):
- dialyzer
The format of the raw analysis result tagged with fun_app_args is changed to {fun_app_args, [ArgNs, Args, Type]}.
- OTP-15804
-
- Application(s):
- mnesia
- Related Id(s):
- PR-2216
Include stacktrace in exception if a dirty activity errors, thus if user have matched on the error thrown it may not match any more.
OTP-22.0 #
- OTP-14282
-
- Application(s):
- asn1, common_test, debugger, dialyzer, erl_docgen, inets, jinterface, observer, otp, syntax_tools, wx
- Related Id(s):
- PR-1891
All incorrect (that is, all) uses of "can not" has been corrected to "cannot" in source code comments, documentation, examples, and so on.
- OTP-14625
-
- Application(s):
- otp
Configure scripts in different OTP applications are now executed in parallel during the build of OTP.
- OTP-15220
-
- Application(s):
- otp
Documented how atoms are ordered in the reference manual.
- OTP-15596
-
- Application(s):
- erts, hipe, otp
*** HIGHLIGHT ***
In OTP 22, HiPE (the native code compiler) is not fully functional. The reasons for this are:
There are new BEAM instructions for binary matching that the HiPE native code compiler does not support.
The new optimizations in the Erlang compiler create new combination of instructions that HiPE currently does not handle correctly.
If erlc is invoked with the +native option, and if any of the new binary matching instructions are used, the compiler will issue a warning and produce a BEAM file without native code.
- OTP-15621
-
- Application(s):
- erl_interface, otp
*** POTENTIAL INCOMPATIBILITY ***
The limited support for VxWorks is deprecated as of OTP 22, and will be removed in OTP 23.
asn1-5.0.9 #
- OTP-14282
-
- Application(s):
- asn1, common_test, debugger, dialyzer, erl_docgen, inets, jinterface, observer, otp, syntax_tools, wx
- Related Id(s):
- PR-1891
All incorrect (that is, all) uses of "can not" has been corrected to "cannot" in source code comments, documentation, examples, and so on.
- OTP-15697
-
- Application(s):
- asn1
- Related Id(s):
- PR-2159
Corrected problems with the following value definitions:
-- value of SEQUENCE OF CHOICE with extensions
-- value of CHOICE with extensions
-- DEFAULT used with OCTET STRING
Full runtime dependencies of asn1-5.0.9: erts-7.0, kernel-3.0, stdlib-2.0
common_test-1.17.3 #
- OTP-14282
-
- Application(s):
- asn1, common_test, debugger, dialyzer, erl_docgen, inets, jinterface, observer, otp, syntax_tools, wx
- Related Id(s):
- PR-1891
All incorrect (that is, all) uses of "can not" has been corrected to "cannot" in source code comments, documentation, examples, and so on.
- OTP-15633
-
- Application(s):
- common_test, stdlib
- Related Id(s):
- PR-1787
Use ssh instead of rsh as the default remote shell.
Full runtime dependencies of common_test-1.17.3: compiler-6.0, crypto-3.6, debugger-4.1, erts-7.0, ftp-1.0.0, inets-6.0, kernel-4.0, observer-2.1, runtime_tools-1.8.16, sasl-2.4.2, snmp-5.1.2, ssh-4.0, stdlib-3.5, syntax_tools-1.7, tools-2.8, xmerl-1.3.8
compiler-7.4 #
- OTP-15760
-
- Application(s):
- compiler, stdlib
- Related Id(s):
- ERL-907
record_info/2 is a pseudo-function that requires literal arguments known at compile time. Therefore, the following usage is illegal: fun record/info/2. The compiler would crash when during compilation of that kind of code. Corrected to issue a compilation error.
- OTP-14894
-
- Application(s):
- compiler
- Related Id(s):
- ERL-714
*** HIGHLIGHT ***
The compiler has been rewritten to internally use an intermediate representation based on Static Single Assignment (SSA). The new intermediate representation makes more optimizations possible.
Most noticeable is that the binary matching optimizations are now applicable in many more circumstances than before.
Another noticeable change is that type optimizations are now applied across local function calls, and will remove a lot more redundant type tests than before.
- OTP-15273
-
- Application(s):
- compiler
- Related Id(s):
- ERL-639
Funs are no longer created when they are only used locally, greatly improving the performance of named funs and "fun-wrapped" macros.
- OTP-15456
-
- Application(s):
- compiler
*** HIGHLIGHT ***
All compiler options that can be given in the source file can now also be given in the option list or from the command line for erlc.
Specifically, the option {nowarn_deprecated_function,MFAs} was only recognized when given in the file with the attribute -compile(). The option {nowarn_unused_function,FAs} was incorrectly documented to only work in a file, but it also worked when given in the option list.
- OTP-15563
-
*** POTENTIAL INCOMPATIBILITY ***
Do not allow function specifications for functions residing in other modules.
- OTP-15715
-
- Application(s):
- compiler, erts
*** HIGHLIGHT ***
Internal documentation has now been added to the *Erts* and *Compiler* applications.
The internal documents for *Erts* describe miscellaneous interesting implementation details. Those details can change at any time.
The internal documentation for *Compiler* documents the API for the Core Erlang modules. While we will not change those APIs without good reason, we don't give the same guarantees about backward compatibility as for the rest of the APIs in OTP.
- OTP-15749
-
- Application(s):
- compiler, stdlib
- Related Id(s):
- ERL-904
There are new compiler options nowarn_removed and {nowarn_removed,Items} to suppress warnings for functions and modules that have been removed from OTP.
Full runtime dependencies of compiler-7.4: crypto-3.6, erts-9.0, hipe-3.12, kernel-4.0, stdlib-2.5
crypto-4.5 #
- OTP-15677
-
- Application(s):
- crypto
*** POTENTIAL INCOMPATIBILITY ***
Fixed a bug in error return for crypto:poly1305/2. It returned the atom notsup instead of the exception notsup.
- OTP-15678
-
- Application(s):
- crypto
*** POTENTIAL INCOMPATIBILITY ***
The cipher chacha20 was introduced in OpenSSL 1.1.0. However, it could in a very odd situation, fail for versions less than OpenSSL 1.1.0d. It is therefore disabled for those versions.
- OTP-14461
-
- Application(s):
- crypto, stdlib
- Related Id(s):
- PR-1857
A new rand module algorithm, exro928ss (Xoroshiro928**), has been implemented. It has got a really long period and good statistical quality for all output bits, while still being only about 50% slower than the default algorithm.
The same generator is also used as a long period counter in a new crypto plugin for the rand module, algorithm crypto_aes. This plugin uses AES-256 to scramble the counter which buries any detectable statistical artifacts. Scrambling is done in chunks which are cached to get good amortized speed (about half of the default algorithm).
- OTP-14732
-
Crypto's single C-file is split into multiple files. The different coding styles in the different parts are unified into a single style.
- OTP-15129
-
- Application(s):
- crypto, erts
Build configuration of the crypto application has been moved from the erts application into the crypto application.
- OTP-15564
-
- Application(s):
- crypto
- Related Id(s):
- PR-2129
Adds two hash functions blake2b and blake2s (64 bit hash and 32 bit hash respectively). These are modern and standard hash functions used in blockchains and encrypted communication protocols. The hash functions are available in OpenSSL since version 1.1.1.
- OTP-15644
-
*** HIGHLIGHT ***
*** POTENTIAL INCOMPATIBILITY ***
A new API is implemented in crypto. See the CRYPTO user's guide, chapter New and Old API for more information.
The old api with the crypto:block_* and crypto:stream_* interfaces are kept for compatibility, but implemented with the new api. Please note that since the error checking is more thorough, there might be arguments with for example faulty lengths that are no longer accepted.
- OTP-15655
-
*** HIGHLIGHT ***
The new hash_info/1 and cipher_info/1 functions returns maps with information about the hash or cipher in the argument.
- OTP-15683
-
- Application(s):
- crypto
Obey additional OpenSSL configure flags when compiling the C-part of the CRYPTO application: no-bf, no-blake2, no-chacha, no-cmac, no-dh, no-dsa, no-md4, no-poly1305, no-rc2, no-rc4 and no-rmd160.
- OTP-15771
-
- Application(s):
- crypto
A new function crypto:supports/1 is introduced. The single argument takes an atom as argument: hashes, public_keys, ciphers, macs, curves or rsa_opts. The return value is a list of supported algorithms.
The difference with the existing crypto:supports/0 is, apart from the argument and the return value, that the old function reports what is supported by the old api, and the new function reports algorithms in the new api.
Full runtime dependencies of crypto-4.5: erts-9.0, kernel-5.3, stdlib-3.4
debugger-4.2.7 #
- OTP-14282
-
- Application(s):
- asn1, common_test, debugger, dialyzer, erl_docgen, inets, jinterface, observer, otp, syntax_tools, wx
- Related Id(s):
- PR-1891
All incorrect (that is, all) uses of "can not" has been corrected to "cannot" in source code comments, documentation, examples, and so on.
Full runtime dependencies of debugger-4.2.7: compiler-5.0, erts-9.0, kernel-5.3, stdlib-3.4, wx-1.2
dialyzer-4.0 #
- OTP-14282
-
- Application(s):
- asn1, common_test, debugger, dialyzer, erl_docgen, inets, jinterface, observer, otp, syntax_tools, wx
- Related Id(s):
- PR-1891
All incorrect (that is, all) uses of "can not" has been corrected to "cannot" in source code comments, documentation, examples, and so on.
- OTP-15135
-
- Application(s):
- dialyzer
By default Dialyzer inserts line breaks in types, contracts, and Erlang Code when formatting results. Use the new --no_indentation option to get the old behavior of not inserting line breaks.
- OTP-15752
-
- Application(s):
- dialyzer
Use bit syntax in warnings instead of Core Erlang syntax, for readability.
- OTP-15779
-
- Application(s):
- dialyzer
*** POTENTIAL INCOMPATIBILITY ***
The format of the raw analysis result tagged with fun_app_args is changed to {fun_app_args, [ArgNs, Args, Type]}.
Full runtime dependencies of dialyzer-4.0: compiler-7.0, erts-9.0, hipe-3.16.1, kernel-5.3, stdlib-3.4, syntax_tools-2.0, wx-1.2
edoc-0.11 #
- OTP-15761
-
- Application(s):
- edoc, syntax_tools
Correct links in the documentation.
Full runtime dependencies of edoc-0.11: erts-6.0, inets-5.10, kernel-3.0, stdlib-2.5, syntax_tools-1.6.14, xmerl-1.3.7
eldap-1.2.8 #
- OTP-15775
-
- Application(s):
- eldap
Fix dialyzer warnings in eldap when not matching the return value of ssl:close/1.
Full runtime dependencies of eldap-1.2.8: asn1-3.0, erts-6.0, kernel-3.0, ssl-5.3.4, stdlib-2.0
erl_docgen-0.9.1 #
- OTP-14282
-
- Application(s):
- asn1, common_test, debugger, dialyzer, erl_docgen, inets, jinterface, observer, otp, syntax_tools, wx
- Related Id(s):
- PR-1891
All incorrect (that is, all) uses of "can not" has been corrected to "cannot" in source code comments, documentation, examples, and so on.
Full runtime dependencies of erl_docgen-0.9.1: edoc-0.7.13, erts-9.0, stdlib-3.4, xmerl-1.3.7
erl_interface-3.12 #
- OTP-15773
-
- Application(s):
- erl_interface, erts
The vxworks configure has been updated to respect the environment CFLAGS.
- OTP-15340
-
- Application(s):
- erl_interface, erts, megaco, odbc
- Related Id(s):
- OTP-14625
Minor adjustments made to build system for parallel configure.
- OTP-15621
-
- Application(s):
- erl_interface, otp
*** POTENTIAL INCOMPATIBILITY ***
The limited support for VxWorks is deprecated as of OTP 22, and will be removed in OTP 23.
- OTP-15622
-
- Application(s):
- erl_interface
*** POTENTIAL INCOMPATIBILITY ***
The old legacy erl_interface library (functions with prefix erl_) is deprecated as of OTP 22, and will be removed in OTP 23. This does not apply to the ei library. Reasonably new gcc compilers will issue deprecation warnings. In order to disable these warnings, define the macro EI_NO_DEPR_WARN.
- OTP-15712
-
- Application(s):
- erl_interface
- Related Id(s):
- OTP-15774
*** POTENTIAL INCOMPATIBILITY ***
Added support to receive, decode, encode and send both bit strings and export funs (fun M:F/A).
New functions ei_decode_bitstring and ei_encode_bitstring have been added in order to decode and encode bit strings where the number of bits is not necessary divisible by 8 (a whole number of bytes). The existing functions ei_decode_fun and ei_encode_fun can now also handle export funs.
Before this change, bit strings and export funs sent to an erl_interface c-node were encoded using an undocumented fallback tuple format. For bit strings {Binary,BitsInLastByte} and for export funs {M,F}. Existing c-node implementations expecting these tuples must be changed to instead use ei_decode_bitstring and ei_decode_fun. As a temporary solution you can also build erl_interface with macro EI_COMPAT=21 or call ei_set_compat_rel(21) to receive the old fallback tuples.
erts-10.4 #
- OTP-15535
-
- Application(s):
- erts
- Related Id(s):
- PR-2055
Do not allocate new bitstring/binary when an empty binary is appended.
- OTP-15543
-
- Application(s):
- erts
- Related Id(s):
- PR-2089
Document that process_info(_, current_function) can return {current_function, undefined} in case of execution of native code.
- OTP-15672
-
- Application(s):
- erts
Fixed bug in ets:select, ets:match and friends which could cause the table to remain fixated (as if ets:safe_fixtable had been called) after the call returned. This could happen for protected tables if another concurrent running process transferred table ownership to the process during its ets:select/match call. Ownership can be transferred using either ets:give_away or the heir table option.
- OTP-15693
-
- Application(s):
- erts
Fixed a Windows-specific bug in file:list_dir/1 that caused it to misbehave on network shares.
- OTP-15694
-
- Application(s):
- erts
- Related Id(s):
- ERL-863
Fixed bug when calling enif_whereis_* from NIF resource destructor. Symptoms could be emulator crash or hanging scheduler threads.
- OTP-15698
-
- Application(s):
- erts
Fixed a bug in the error case of apply/3, where the exception would erroneously have an empty argument list in some cases.
- OTP-15707
-
- Application(s):
- erts, stdlib
A bug has been fixed in the maps implementation that could cause a crash or memory usage to grow until the machine ran out of memory. This could happen when inserting a new key-value pair with a key K1 containing a binary B1 into a map M having a key K2 with a binary B2 if the following conditions were met:
-- B1 =/= B2
-- size(B1) >= 4294967296
-- size(B2) >= 4294967296
-- size(M) >= 32
-- (size(B1) rem 4294967296) == (size(B2) rem 4294967296)
-- the first (size(B1) rem 4294967296) bytes are the same both in B1 and B2
-- substituting B1 in K1 with B2 would create a term with the same value as K2
The root cause of the problem is that the maps implementation only hashed the first (X rem 4294967296) bytes of binaries so that different binaries could get the same hash value independently of the hash seed.
- OTP-15708
-
- Application(s):
- erts
term_to_binary() and distributed sends will now throw a system_limit exception instead of producing erroneous results when trying to encode a binary larger than 4 GB.
- OTP-15773
-
- Application(s):
- erl_interface, erts
The vxworks configure has been updated to respect the environment CFLAGS.
- OTP-15788
-
- Application(s):
- erts
Fix configure to not enable PGO (profile guided optimizations) when linking of the PGO binary fails. For instance this happens when there is no gcov lib installed.
- OTP-15791
-
- Application(s):
- erts
Fix bug on OpenBSD where sockets using active, true or active, N could cause the system to live lock. The bug was introduced in erts-10.2 (OTP-21.2).
- OTP-13397
-
- Application(s):
- erts
*** HIGHLIGHT ***
Add support for Erlang Distribution protocol to split the payload of large signals into several fragments. This allows other processes to communicate uninterrupted during the transmission of these signals.
- OTP-14831
-
- Application(s):
- erts, kernel
*** HIGHLIGHT ***
A simple socket API is provided through the socket module. This is a low level API that does *not* replace gen_[tcp|udp|sctp]. It is intended to *eventually* replace the inet driver, but not the high level gen-modules (gen_tcp, gen_udp and gen_sctp). It also provides a basic API that facilitates the implementation of other protocols, that is TCP, UDP and SCTP.
Known issues are; No support for the Windows OS (currently).
- OTP-15011
-
- Application(s):
- erts
- Related Id(s):
- PR-2147
Added NIF functions enif_set_pid_undefined, enif_is_pid_undefined and enif_compare_pids.
- OTP-15063
-
- Application(s):
- erts
Underutilized memory segments (carriers) can now move between all allocator instances, rather than just between instances of the same type, which greatly reduces memory usage in some scenarios.
- OTP-15075
-
- Application(s):
- erts
The emulator will now mark free blocks in pooled carriers with madvise(2) + MADV_FREE (or similar), letting the OS reclaim the associated physical memory if necessary.
- OTP-15095
-
- Application(s):
- erts
New ERL_NIF_SELECT_CANCEL feature added to enif_select in order to cancel (or "deselect") a read or write event on a previously selected file descriptor.
- OTP-15128
-
- Application(s):
- erts, stdlib
*** HIGHLIGHT ***
ETS option write_concurrency now also affects and improves the scalability of ordered_set tables. The implementation is based on a data structure called contention adapting search tree, where the lock granularity adapts to the actual amount of concurrency exploited by the applications in runtime.
- OTP-15129
-
- Application(s):
- crypto, erts
Build configuration of the crypto application has been moved from the erts application into the crypto application.
- OTP-15195
-
- Application(s):
- erts
- Related Id(s):
- PR-1812
Anonymous functions that don't capture environment are now created at load-time instead of in run-time.
- OTP-15211
-
- Application(s):
- erts
- Related Id(s):
- PR-1889
Optimize updates of maps with identical keys and values. E.g. in the example below the original Map will be reused as the return of the update.
1> Map = #{ a => b }. #{ a => b } 2> Map#{ a := b }.
- OTP-15238
-
- Application(s):
- erts
- Related Id(s):
- PR-1803
Optimize binary:match/2 and binary:matches/2 to use memchr internally.
- OTP-15261
-
- Application(s):
- erts
The runtime system used to terminate when a message larger than 2 Gb was passed over the distribution. The send operation will now instead throw a system_limit exception.
- OTP-15336
-
- Application(s):
- erts, sasl
- Related Id(s):
- PR-1825
Change the first module called by erts to be named erl_init instead of otp_ring0. systools in sasl have been updated to reflect this change.
- OTP-15340
-
- Application(s):
- erl_interface, erts, megaco, odbc
- Related Id(s):
- OTP-14625
Minor adjustments made to build system for parallel configure.
- OTP-15349
-
- Application(s):
- erts
- Related Id(s):
- PR-2084
Two new NIF interface functions enif_select_read and enif_select_write. They are similar to existing enif_select but allow a custom event message as an argument.
- OTP-15351
-
- Application(s):
- erts
- Related Id(s):
- ERL-749
The embedded copy of zlib has been updated from 1.2.8 to 1.2.11.
Note that this copy is only used as a fallback when the target platform doesn't provide any zlib development libraries. If your system provides zlib then it will be used even if it is older than 1.2.11.
- OTP-15362
-
- Application(s):
- erts
- Related Id(s):
- PR-2127
New NIF function enif_make_monitor_term.
- OTP-15427
-
- Application(s):
- erts
Appending lists (The ++ operator) will now yield properly on large inputs.
- OTP-15439
-
- Application(s):
- erts
*** HIGHLIGHT ***
The length/1 BIF used to calculate the length of the list in one go without yielding, even if the list was very long. In OTP 22, length/1 will yield when called with long lists.
- OTP-15513
-
- Application(s):
- erts
- Related Id(s):
- ERL-773
Processes sending messages are now punished with a reduction cost based on message size. That is, a process sending a large message will yield earlier than before.
- OTP-15581
-
- Application(s):
- erts
- Related Id(s):
- OTP-15580
The transitory emulator option +ztma true (introduced in OTP 21.3) has been removed.
- OTP-15596
-
- Application(s):
- erts, hipe, otp
*** HIGHLIGHT ***
In OTP 22, HiPE (the native code compiler) is not fully functional. The reasons for this are:
There are new BEAM instructions for binary matching that the HiPE native code compiler does not support.
The new optimizations in the Erlang compiler create new combination of instructions that HiPE currently does not handle correctly.
If erlc is invoked with the +native option, and if any of the new binary matching instructions are used, the compiler will issue a warning and produce a BEAM file without native code.
- OTP-15610
-
- Application(s):
- erts
The termination behaviour of processes has changed to allow processes to yield while sending link exit/monitor down signals.
The erl crash dump has been expanded to now also include processes that are termeinating but have not yet terminated.
- OTP-15611
-
- Application(s):
- erts, kernel
The dist messages EXIT, EXIT2 and MONITOR_DOWN have been updated with new versions that send the reason term as part of the payload of the message instead of as part of the control message.
The old versions are still present and can be used when communicating with nodes that don't support the new versions.
- OTP-15612
-
- Application(s):
- erts
When sending messages, exit, exit2 and monitor down distributed signals, the process sending will now yield appropriately.
This means that a terminating process will yield and possibly be suspended on busy distribution entries while they are terminating. This means that any memory held by such processes will not be released until after all exit/monitor down signals have been sent.
- OTP-15613
-
- Application(s):
- erts
All external pids/ports/refs created by erlang:list_to_pid/port/ref debug functions now compare equal to any other pid/port/ref with the same number from that node.
Before this change they compared differently because the node creation of the pid/port/ref did not compare equal to any real pid/port/ref creation.
This will mostly effect pids/ports/refs typed in the shell.
- OTP-15615
-
- Application(s):
- erts, stdlib
The persistent_term functions put/2 and erase/1 are now yielding.
- OTP-15617
-
- Application(s):
- erts
A new erlang:dist_ctrl_set_opt(DHandle, get_size, Value) option has been added. This option makes it possible to configure the distribution channel identified by DHandle so that erlang:dist_ctrl_get_data(DHandle) also returns the size of the data to pass over the channel.
- OTP-15623
-
- Application(s):
- erts, stdlib
- Related Id(s):
- PR-2190
Previously, all ETS tables used centralized counter variables to keep track of the number of items stored and the amount of memory consumed. These counters can cause scalability problems (especially on big NUMA systems). This change adds an implementation of a decentralized counter and modifies the implementation of ETS so that ETS tables of type ordered_set with write_concurrency enabled use the decentralized counter. Experiments indicate that this change substantially improves the scalability of ETS ordered_set tables with write_concurrency enabled in scenarios with frequent ets:insert/2 and ets:delete/2 calls.
- OTP-15631
-
- Application(s):
- erts
The iolist_size/1 function is now yielding which means that an Erlang/OTP system will be responsive even if the applications running on the system frequently call iolist_size/1 with large iolists.
- OTP-15635
-
- Application(s):
- erts
A simple test suite for the net module has been added.
- OTP-15640
-
- Application(s):
- erts
*** HIGHLIGHT ***
Added the NIF function enif_term_type, which helps avoid long sequences of enif_is_xyz by returning the type of the given term. This is especially helpful for NIFs that serialize terms, such as JSON encoders, where it can improve both performance and readability.
- OTP-15674
-
- Application(s):
- erts
- Related Id(s):
- PR-2177
The last call optimization is now applied to BIFs. When calling a BIF in the tail position of a function, the return address and stack frame will now be discarded before calling the BIF. As a consequence of this change, the immediate caller of a tail-called BIF will no longer be available in stack backtraces.
- OTP-15703
-
- Application(s):
- erts
Fix GC bug where distributed messages in a processes mailbox would cause extra GCs. This can be very expensive if there many messages in the mailbox.
- OTP-15715
-
- Application(s):
- compiler, erts
*** HIGHLIGHT ***
Internal documentation has now been added to the *Erts* and *Compiler* applications.
The internal documents for *Erts* describe miscellaneous interesting implementation details. Those details can change at any time.
The internal documentation for *Compiler* documents the API for the Core Erlang modules. While we will not change those APIs without good reason, we don't give the same guarantees about backward compatibility as for the rest of the APIs in OTP.
- OTP-15740
-
- Application(s):
- erts
The performance of non-bignum integer arithmetic has been improved.
- OTP-15794
-
- Application(s):
- erts
- Related Id(s):
- PR-2219
The -remsh option to erl now automatically adds the local systems hostname to the target node if no nodename is given. e.g.
erl -name foo -remsh bar
erl -sname foo -remsh bar
Full runtime dependencies of erts-10.4: kernel-6.1, sasl-3.3, stdlib-3.5
hipe-3.19 #
- OTP-15385
-
- Application(s):
- hipe
- Related Id(s):
- PR-1986
Add function hipe:erllvm_is_supported to check for the presences of a suitable version of the LLVM tool chain as well as supported hardware architecture. The old hipe:llvm_support_available has been removed.
- OTP-15386
-
- Application(s):
- hipe
- Related Id(s):
- PR-1963
Fix hipe LLVM for FreeBSD and other non-linux unix to use /tmp/ instead of /dev/shm/.
- OTP-15596
-
- Application(s):
- erts, hipe, otp
*** HIGHLIGHT ***
In OTP 22, HiPE (the native code compiler) is not fully functional. The reasons for this are:
There are new BEAM instructions for binary matching that the HiPE native code compiler does not support.
The new optimizations in the Erlang compiler create new combination of instructions that HiPE currently does not handle correctly.
If erlc is invoked with the +native option, and if any of the new binary matching instructions are used, the compiler will issue a warning and produce a BEAM file without native code.
Full runtime dependencies of hipe-3.19: compiler-5.0, erts-9.3, kernel-5.3, stdlib-3.4, syntax_tools-1.6.14
inets-7.0.8 #
- OTP-14282
-
- Application(s):
- asn1, common_test, debugger, dialyzer, erl_docgen, inets, jinterface, observer, otp, syntax_tools, wx
- Related Id(s):
- PR-1891
All incorrect (that is, all) uses of "can not" has been corrected to "cannot" in source code comments, documentation, examples, and so on.
Full runtime dependencies of inets-7.0.8: erts-6.0, kernel-3.0, mnesia-4.12, runtime_tools-1.8.14, ssl-5.3.4, stdlib-3.5
jinterface-1.10 #
- OTP-14282
-
- Application(s):
- asn1, common_test, debugger, dialyzer, erl_docgen, inets, jinterface, observer, otp, syntax_tools, wx
- Related Id(s):
- PR-1891
All incorrect (that is, all) uses of "can not" has been corrected to "cannot" in source code comments, documentation, examples, and so on.
- OTP-15774
-
- Application(s):
- jinterface
- Related Id(s):
- OTP-15712
*** POTENTIAL INCOMPATIBILITY ***
Added support to receive export funs (fun M:F/A).
Before this change, export funs sent to a jinterface node were encoded using an undocumented fallback tuple format {M,F}. Existing jinterface implementations expecting these tuples must be changed to instead use the existing OtpErlangExternalFun class.
kernel-6.4 #
- OTP-15786
-
- Application(s):
- kernel
- Related Id(s):
- ERL-918
Fix so that when multiple -sname or -name are given to erl the first one is chosen. Before this fix distribution was not started at all when multiple name options were given.
- OTP-15806
-
- Application(s):
- kernel
Fix inet_res configuration pointing to non-existing files to work again. This was broken in KERNEL-6.3 (OTP-21.3).
- OTP-14831
-
- Application(s):
- erts, kernel
*** HIGHLIGHT ***
A simple socket API is provided through the socket module. This is a low level API that does *not* replace gen_[tcp|udp|sctp]. It is intended to *eventually* replace the inet driver, but not the high level gen-modules (gen_tcp, gen_udp and gen_sctp). It also provides a basic API that facilitates the implementation of other protocols, that is TCP, UDP and SCTP.
Known issues are; No support for the Windows OS (currently).
- OTP-15491
-
- Application(s):
- kernel
- Related Id(s):
- PR-2019
Improved the documentation for the linger option.
- OTP-15607
-
- Application(s):
- kernel
- Related Id(s):
- ERIERL-280
Global no longer tries more than once when connecting to other nodes.
- OTP-15611
-
- Application(s):
- erts, kernel
The dist messages EXIT, EXIT2 and MONITOR_DOWN have been updated with new versions that send the reason term as part of the payload of the message instead of as part of the control message.
The old versions are still present and can be used when communicating with nodes that don't support the new versions.
- OTP-15668
-
- Application(s):
- kernel
- Related Id(s):
- PR-2088
Kernel configuration parameter start_distribution = boolean() is added. If set to false, the system is started with all distribution functionality disabled. Defaults to true.
- OTP-15692
-
- Application(s):
- kernel
- Related Id(s):
- PR-2170
*** POTENTIAL INCOMPATIBILITY ***
In OTP-21.3, a warning was introduced for duplicated applications/keys in configuration. This warning would be displayed both when the configuration was given as a file on system start, and during runtime via application:set_env/1,2.
The warning is now changed to a badarg exception in application:set_env/1,2. If the faulty configuration is given in a configuration file on system start, the startup will fail.
Full runtime dependencies of kernel-6.4: erts-10.2.5, sasl-3.0, stdlib-3.5
megaco-3.18.5 #
- OTP-15262
-
- Application(s):
- megaco, runtime_tools
- Related Id(s):
- OTP-15129
Minor updates to build system necessary due to move of configuration of crypto application.
- OTP-15340
-
- Application(s):
- erl_interface, erts, megaco, odbc
- Related Id(s):
- OTP-14625
Minor adjustments made to build system for parallel configure.
Full runtime dependencies of megaco-3.18.5: asn1-3.0, debugger-4.0, erts-7.0, et-1.5, kernel-3.0, runtime_tools-1.8.14, stdlib-2.5
mnesia-4.16 #
- OTP-15550
-
- Application(s):
- mnesia
- Related Id(s):
- PR-2029
Optimize mnesia:read/1 if data have been written in the same transaction.
- OTP-15689
-
Fixed bugs in table index plugin handling.
- OTP-15588
-
- Application(s):
- mnesia
- Related Id(s):
- PR-2102
Optimized dumping of tables with plugin backends.
- OTP-15804
-
- Application(s):
- mnesia
- Related Id(s):
- PR-2216
*** POTENTIAL INCOMPATIBILITY ***
Include stacktrace in exception if a dirty activity errors, thus if user have matched on the error thrown it may not match any more.
Full runtime dependencies of mnesia-4.16: erts-9.0, kernel-5.3, stdlib-3.4
observer-2.9.1 #
- OTP-14282
-
- Application(s):
- asn1, common_test, debugger, dialyzer, erl_docgen, inets, jinterface, observer, otp, syntax_tools, wx
- Related Id(s):
- PR-1891
All incorrect (that is, all) uses of "can not" has been corrected to "cannot" in source code comments, documentation, examples, and so on.
Full runtime dependencies of observer-2.9.1: erts-7.0, et-1.5, kernel-3.0, runtime_tools-1.8.14, stdlib-3.5, wx-1.2
os_mon-2.5 #
- OTP-15770
-
- Application(s):
- os_mon
- Related Id(s):
- PR-2208
Fix typespec of cpu_sup:util().
- OTP-14984
-
- Application(s):
- os_mon, snmp
- Related Id(s):
- OTP-15329
The application otp_mibs has been removed from OTP. Some of its components (mibs) have been moved to other apps (snmp), or removed completely (os_mon).
Full runtime dependencies of os_mon-2.5: erts-6.0, kernel-3.0, sasl-2.4, stdlib-2.0
public_key-1.6.7 #
- OTP-15754
-
- Application(s):
- public_key
- Related Id(s):
- ERL-878
RSA options passed to crypto for encrypt and decrypt with public or private key.
- OTP-15776
-
- Application(s):
- public_key
Fix dialyzer warnings caused by a faulty type specification for digest_type().
This change updates digest_type() and the functions operating with this argument type to accept both 'sha1' and 'sha' as digest_type().
- OTP-13726
-
- Application(s):
- public_key
Add possibility to read PEM files encrypted with old PEM encryption using AES-256
- OTP-15687
-
- Application(s):
- public_key
- Related Id(s):
- PR-2162
Relax decoding of certificates to so that "harmless" third party encoding errors may be accepted but not created by the public_key application. This adds acceptance of using an incorrect three character country code, the PKIX standard use two character country codes. It is also accepted that the country code is utf8 encoded but the specification says it should be ASCII.
Full runtime dependencies of public_key-1.6.7: asn1-3.0, crypto-3.8, erts-6.0, kernel-3.0, stdlib-3.5
reltool-0.8 #
- OTP-15571
-
- Application(s):
- reltool
*** POTENTIAL INCOMPATIBILITY ***
A new element, Opts, can now be included in a rel tuple in the reltool release specific configuration format: {rel, Name, Vsn, RelApps, Opts}.
This supports the use of {rel, Name, Vsn, RelApps, [{load_dot_erlang, false}]} to prevent the boot script from running the .erlang file.
The incompatibilities are as follows:
* The return from reltool:get_config/1 and reltool:get_config/3 includes the new rel tuple for all releases where the load_dot_erlang option is set to false.
* The return from reltool:get_config/3 includes the new rel tuple for ALL releases if the InclDefs parameter is set to true.
Full runtime dependencies of reltool-0.8: erts-7.0, kernel-3.0, sasl-2.4, stdlib-3.4, tools-2.6.14, wx-1.2
snmp-5.3 #
- OTP-14984
-
- Application(s):
- os_mon, snmp
- Related Id(s):
- OTP-15329
The application otp_mibs has been removed from OTP. Some of its components (mibs) have been moved to other apps (snmp), or removed completely (os_mon).
- OTP-15691
-
- Application(s):
- snmp
- Related Id(s):
- ERIERL-324
*** HIGHLIGHT ***
[snmp|agent] Add a get-mechanism callback module (and a corresponding behaviour). The agent calls this module to handle each get (get, get-next and get-bulk) request.
Full runtime dependencies of snmp-5.3: crypto-3.3, erts-6.0, kernel-3.0, mnesia-4.12, runtime_tools-1.8.14, stdlib-2.5
ssh-4.7.7 #
- OTP-15673
-
- Application(s):
- ssh
SSH uses the new crypto API.
Full runtime dependencies of ssh-4.7.7: crypto-4.5, erts-9.0, kernel-5.3, public_key-1.6.1, stdlib-3.4.1
ssl-9.3 #
- OTP-14792
-
- Application(s):
- ssl
The distribution handshake with TLS distribution (inet_tls_dist) does now utilize the socket option {nodelay, true}, which decreases the distribution setup time significantly.
- OTP-15710
-
- Application(s):
- ssl
- Related Id(s):
- ERL-893
Correct shutdown reason to avoid an incorrect crash report
- OTP-15746
-
- Application(s):
- ssl
- Related Id(s):
- ERIERL-333
Enhance documentation and type specifications.
- OTP-14865
-
- Application(s):
- ssl
*** POTENTIAL INCOMPATIBILITY ***
TLS-1.0, TLS-1.1 and DTLS-1.0 are now considered legacy and not supported by default
- OTP-15055
-
- Application(s):
- ssl
*** HIGHLIGHT ***
Use new logger API in ssl. Introduce log levels and verbose debug logging for SSL.
- OTP-15483
-
- Application(s):
- ssl
- Related Id(s):
- ERL-924
*** HIGHLIGHT ***
Add new API function str_to_suite/1, cipher_suites/3 (list cipher suites as rfc or OpenSSL name strings) and suite_to_openssl_str/1
- OTP-15591
-
- Application(s):
- ssl
*** HIGHLIGHT ***
Basic support for TLS 1.3 Server for experimental use. The client is not yet functional, for more information see the Standards Compliance chapter of the User's Guide.
- OTP-15626
-
- Application(s):
- ssl
Add support for PSK CCM ciphers from RFC 6655
Full runtime dependencies of ssl-9.3: crypto-4.2, erts-10.0, inets-5.10.7, kernel-6.0, public_key-1.5, stdlib-3.5
stdlib-3.9 #
- OTP-15649
-
- Application(s):
- stdlib
Fix a bug in string:lexemes/2.
The bug was found when optimizing the handling of deep lists of Unicode characters in the string module.
- OTP-15707
-
- Application(s):
- erts, stdlib
A bug has been fixed in the maps implementation that could cause a crash or memory usage to grow until the machine ran out of memory. This could happen when inserting a new key-value pair with a key K1 containing a binary B1 into a map M having a key K2 with a binary B2 if the following conditions were met:
-- B1 =/= B2
-- size(B1) >= 4294967296
-- size(B2) >= 4294967296
-- size(M) >= 32
-- (size(B1) rem 4294967296) == (size(B2) rem 4294967296)
-- the first (size(B1) rem 4294967296) bytes are the same both in B1 and B2
-- substituting B1 in K1 with B2 would create a term with the same value as K2
The root cause of the problem is that the maps implementation only hashed the first (X rem 4294967296) bytes of binaries so that different binaries could get the same hash value independently of the hash seed.
- OTP-15751
-
- Application(s):
- stdlib
Since the introduction of the stack trace variable, the Erlang Pretty Printer has left out the exception class throw even when the stack trace variable cannot be left out, which is not correct Erlang code. The fix is to always include the exception class throw.
- OTP-15760
-
- Application(s):
- compiler, stdlib
- Related Id(s):
- ERL-907
record_info/2 is a pseudo-function that requires literal arguments known at compile time. Therefore, the following usage is illegal: fun record/info/2. The compiler would crash when during compilation of that kind of code. Corrected to issue a compilation error.
- OTP-14461
-
- Application(s):
- crypto, stdlib
- Related Id(s):
- PR-1857
A new rand module algorithm, exro928ss (Xoroshiro928**), has been implemented. It has got a really long period and good statistical quality for all output bits, while still being only about 50% slower than the default algorithm.
The same generator is also used as a long period counter in a new crypto plugin for the rand module, algorithm crypto_aes. This plugin uses AES-256 to scramble the counter which buries any detectable statistical artifacts. Scrambling is done in chunks which are cached to get good amortized speed (about half of the default algorithm).
- OTP-14724
-
- Application(s):
- stdlib
- Related Id(s):
- PR-2056
Types related to server naming and starting have been exported from gen_statem. These are: server_name/0, server_ref/0, start_opt/0, start_ret/0 and enter_loop_opt/0.
- OTP-14731
-
- Application(s):
- stdlib
- Related Id(s):
- PR-1969
The default algorithm for the rand module has been changed to exsss (Xorshift116**) which is a combination of the Xorshift116 (exsp) state update and a new scrambler "StarStar" from the 2018 paper "Scrambled Linear Pseudorandom Number Generators" by David Blackman and Sebastiano Vigna. This combination should not have the caveat of weak low bits that the previous default algorithm(s) have had, with the cost of about 10% lower speed. See GitHub pull request #1969.
- OTP-14737
-
- Application(s):
- stdlib
- Related Id(s):
- PR-1855
The generic state machine behaviour gen_statem has gotten code cleanup and documentation improvements from GitHub Pull Request #1855, even though the PR itself was rejected.
- OTP-15111
-
- Application(s):
- stdlib
Update Unicode specification to version 11.0.
- OTP-15128
-
- Application(s):
- erts, stdlib
*** HIGHLIGHT ***
ETS option write_concurrency now also affects and improves the scalability of ordered_set tables. The implementation is based on a data structure called contention adapting search tree, where the lock granularity adapts to the actual amount of concurrency exploited by the applications in runtime.
- OTP-15200
-
- Application(s):
- stdlib
- Related Id(s):
- PR-1878
Optimized maps:new/0 with trivial Erlang implementation, making use of literal terms (the empty map) not needing dynamic heap allocation.
- OTP-15381
-
- Application(s):
- stdlib
*** POTENTIAL INCOMPATIBILITY ***
The gen_* behaviours have been changed so that if logging of the last N messages through sys:log/2,3 is active for the server, this log is included in the terminate report.
To accomplish this the format of "System Events" as defined in the man page for sys has been clarified and cleaned up, a new function sys:get_log/1 has been added, and sys:get_debug/3 has been deprecated. Due to these changes, code that relies on the internal badly documented format of "System Events", need to be corrected.
- OTP-15452
-
- Application(s):
- stdlib
The gen_statem behaviour engine loop has been optimized for better performance in particular when the callback module returns some actions, that is better performance for more realistic applications than the Echo Benchmark.
- OTP-15563
-
*** POTENTIAL INCOMPATIBILITY ***
Do not allow function specifications for functions residing in other modules.
- OTP-15615
-
- Application(s):
- erts, stdlib
The persistent_term functions put/2 and erase/1 are now yielding.
- OTP-15623
-
- Application(s):
- erts, stdlib
- Related Id(s):
- PR-2190
Previously, all ETS tables used centralized counter variables to keep track of the number of items stored and the amount of memory consumed. These counters can cause scalability problems (especially on big NUMA systems). This change adds an implementation of a decentralized counter and modifies the implementation of ETS so that ETS tables of type ordered_set with write_concurrency enabled use the decentralized counter. Experiments indicate that this change substantially improves the scalability of ETS ordered_set tables with write_concurrency enabled in scenarios with frequent ets:insert/2 and ets:delete/2 calls.
- OTP-15633
-
- Application(s):
- common_test, stdlib
- Related Id(s):
- PR-1787
Use ssh instead of rsh as the default remote shell.
- OTP-15680
-
- Application(s):
- stdlib
- Related Id(s):
- PR-2114
Added beam_lib:strip/2 and friends, which accept a list of chunks that should be preserved when stripping.
- OTP-15705
-
- Application(s):
- stdlib
Optimize printing of maps with io_lib:write(). Also optimize pretty printing of strings (~s and ~ts) when limiting the output with the chars_limit option.
- OTP-15749
-
- Application(s):
- compiler, stdlib
- Related Id(s):
- ERL-904
There are new compiler options nowarn_removed and {nowarn_removed,Items} to suppress warnings for functions and modules that have been removed from OTP.
- OTP-15755
-
- Application(s):
- stdlib
Let the Erlang Pretty Printer put atomic parts on the same line.
- OTP-15756
-
- Application(s):
- stdlib
Add option quote_singleton_atom_types to the Erlang Pretty Printer's functions. Setting the option to true adds quotes to all singleton atom types.
Full runtime dependencies of stdlib-3.9: compiler-5.0, crypto-3.3, erts-10.4, kernel-6.0, sasl-3.0
syntax_tools-2.2 #
- OTP-14282
-
- Application(s):
- asn1, common_test, debugger, dialyzer, erl_docgen, inets, jinterface, observer, otp, syntax_tools, wx
- Related Id(s):
- PR-1891
All incorrect (that is, all) uses of "can not" has been corrected to "cannot" in source code comments, documentation, examples, and so on.
- OTP-15761
-
- Application(s):
- edoc, syntax_tools
Correct links in the documentation.
Full runtime dependencies of syntax_tools-2.2: compiler-7.0, erts-9.0, kernel-5.0, stdlib-3.4
tools-3.2 #
- OTP-15534
-
- Application(s):
- tools
- Related Id(s):
- PR-2078
Add cprof and tags modules to .app file so that they are included in releases.
- OTP-15699
-
- Application(s):
- tools
- Related Id(s):
- PR-2184
Improved documentation parsing in emacs erldoc functionality.
- OTP-15575
-
- Application(s):
- tools
*** HIGHLIGHT ***
The cover tool now uses the counters module instead of ets for updating the counters for how many times a line has been executed. By default, Cover will work with distributed nodes, but a new function cover:local_only/0 allows running the Cover in a restricted but faster local-only mode.
The increase in speed will vary depending on the type of code being cover-compiled, but as an example, the compiler test suite runs more than twice as fast with the new Cover.
Full runtime dependencies of tools-3.2: compiler-5.0, erts-9.1, kernel-5.4, runtime_tools-1.8.14, stdlib-3.4
wx-1.8.8 #
- OTP-14282
-
- Application(s):
- asn1, common_test, debugger, dialyzer, erl_docgen, inets, jinterface, observer, otp, syntax_tools, wx
- Related Id(s):
- PR-1891
All incorrect (that is, all) uses of "can not" has been corrected to "cannot" in source code comments, documentation, examples, and so on.
Full runtime dependencies of wx-1.8.8: erts-6.0, kernel-3.0, stdlib-2.0