diff options
Diffstat (limited to 'erts/doc/src/notes.xml')
| -rw-r--r-- | erts/doc/src/notes.xml | 454 |
1 files changed, 454 insertions, 0 deletions
diff --git a/erts/doc/src/notes.xml b/erts/doc/src/notes.xml index 022c3b7eb1..3a2456086c 100644 --- a/erts/doc/src/notes.xml +++ b/erts/doc/src/notes.xml @@ -31,6 +31,460 @@ </header> <p>This document describes the changes made to the ERTS application.</p> +<section><title>Erts 13.0</title> + + <section><title>Fixed Bugs and Malfunctions</title> + <list> + <item> + <p> + The socket option 'reuseaddr' is *no longer* ignored on + Windows.</p> + <p> + Own Id: OTP-17447 Aux Id: GH-4819 </p> + </item> + <item> + <p> + The growth rate of writable binaries has been adjusted to + only increase by 20% after 16MB in size. Before this + change the size would always double.</p> + <p> + This change may degrade write performance of large + binaries.</p> + <p> + *** POTENTIAL INCOMPATIBILITY ***</p> + <p> + Own Id: OTP-17569 Aux Id: PR-4793 </p> + </item> + <item> + <p> + Fix reduction counting bug in <c>re:run</c> that caused + the function to yield too frequently when doing + <c>global</c> matches.</p> + <p> + Own Id: OTP-17661 Aux Id: PR-5165 </p> + </item> + <item> + <p> + Fix spelling mistakes in epmd error messages.</p> + <p> + Own Id: OTP-17758 Aux Id: PR-5391 </p> + </item> + <item> + <p> + Fix bug where the "newshell" would trigger a newline at + the column width of the terminal, even if the next + character to be printed was a newline. This would cause + the terminal to render two newlines instead of one.</p> + <p> + Own Id: OTP-17779 Aux Id: GH-5403 PR-5599 </p> + </item> + <item> + <p> + Fix the memory value returned from + <c>ets:info(Tid,memory)</c> when the + <c>read_concurrency</c> option is used.</p> + <p> + Before this fix the memory used by the scheduler specific + lock cache lines was not counted towards the total. This + caused the returned memory usage to be very incorrect on + systems with many schedulers for tables with man locks.</p> + <p> + Own Id: OTP-17832 Aux Id: PR-5494 </p> + </item> + <item> + <p> + Fix the undocumented <c>--profile_boot</c> option to work + again.</p> + <p> + Own Id: OTP-17836 Aux Id: PR-5546 </p> + </item> + <item> + <p> + Let EPMD tolerate failure when binding to IPv4/IPv6 + loopback intefaces in addition to user-supplied addresses + via <c>ERL_EPMD_ADDRESS</c> or the <c>-address</c> + option. This can happen, for example, if the host system + has ipv6 disabled via the disable_ipv6 sysctl.</p> + <p> + Own Id: OTP-17970 Aux Id: PR-5762 </p> + </item> + </list> + </section> + + + <section><title>Improvements and New Features</title> + <list> + <item> + <p> + Users can now configure ETS tables with the + <c>{write_concurrency, auto}</c> option. This option + forces tables to automatically change the number of locks + that are used at run-time depending on how much + concurrency is detected. The <c>{decentralized_counters, + true}</c> option is enabled by default when + <c>{write_concurrency, auto}</c> is active.</p> + <p> + Benchmark results comparing this option with the other + ETS optimization options are available here:</p> + <p> + https://erlang.org/bench/ets_bench_result_lock_config.html</p> + <p> + Own Id: OTP-15991 Aux Id: PR-5208 </p> + </item> + <item> + <p>To enable more optimizations, BEAM files compiled with + OTP 21 and earlier cannot be loaded in OTP 25.</p> + <p> + Own Id: OTP-16702</p> + </item> + <item> + <p> + Optimize minor garbage collection for processes with + large number of binaries, funs and/or external + pids/ports/refs. This is a continuation of the + optimization (OTP-17602) released in OTP-24.1.</p> + <p> + Own Id: OTP-16852 Aux Id: ERL-1347, PR-5195 </p> + </item> + <item> + <p> + The signal queue of a process with + message_queue_data=off_heap* has been optimized to allow + parallel reception of signals from multiple processes. </p> + <p> + This is possible to do as Erlang only guarantees that + signals (i.e., message signals and non-message signals) + sent from a single process to another process are ordered + in send order. However, there are no ordering guarantees + for signals sent from different processes to a particular + process. Therefore, several processes can send signals in + parallel to a specific process without synchronizing with + each other. However, such signal sending was previously + always serialized as the senders had to acquire the lock + for the outer signal queue of the receiving process. This + parallel signal sending optimization yields much better + scalability for signal sending than what was previously + possible, see + https://erlang.org/bench/sigq_bench_result.html for + benchmark results.</p> + <p> + * Information about how to enable the + message_queue_data=off_heap setting can be found in the + documentation of the function erlang:process_flag/2.</p> + <p> + Own Id: OTP-16982 Aux Id: PR-5020 </p> + </item> + <item> + <p>The JIT now works for 64-bit ARM processors.</p> + <p> + Own Id: OTP-17119 Aux Id: PR-4869 </p> + </item> + <item> + <p> + Added support for the compile attribute <c>-nifs()</c> to + empower compiler and loader with information about which + functions may be overridden as NIFs by + <c>erlang:load_nif/2</c>. It is recommended to use this + attribute in all modules that load NIF libraries.</p> + <p> + Own Id: OTP-17151 Aux Id: ERIERL-590, PR-5479 </p> + </item> + <item> + <p> + A test case has been added to the otp_SUITE that test + that the dependency versions for OTP's applications are + correct. The test case uses xref to check if the used + functions are available in the specified dependency + versions. The test case depends on the Erlang/OTP team's + testing infrastructure and will be skipped if its + dependencies are not met.</p> + <p> + Own Id: OTP-17224</p> + </item> + <item> + <p> + An Erlang installation directory is now relocatable on + the file system given that the paths in the + installation's <c>RELEASES</c> file are paths that are + relative to the installations root directory. The + <c>`release_handler:create_RELEASES/4</c> function can + generate a <c>RELEASES</c> file with relative paths if + its <c>RootDir</c> parameter is set to the empty string.</p> + <p> + Own Id: OTP-17304</p> + </item> + <item> + <p>The following distribution flags are now mandatory: + <c>DFLAG_BIT_BINARIES</c>, <c>DFLAG_EXPORT_PTR_TAG</c>, + <c>DFLAG_MAP_TAGS</c>, <c>DFLAG_NEW_FLOATS</c>, and + <c>DFLAG_FUN_TAGS</c>. This mainly concerns libraries or + application that implement the distribution protocol + themselves.</p> + <p> + Own Id: OTP-17318 Aux Id: PR-4972 </p> + </item> + <item> + <p> + Input for <c>configure</c> scripts adapted to + <c>autoconf</c> 2.71.</p> + <p> + Own Id: OTP-17414 Aux Id: PR-4967 </p> + </item> + <item> + <p>When binary construction using the binary syntax + fails, the error message printed in the shell and by + <c>erl_error:format_exception/3,4</c> will contain more + detailed information about what went wrong.</p> + <p> + Own Id: OTP-17504 Aux Id: GH-4971, PR-5281, PR-5752 </p> + </item> + <item> + <p> + The configuration files <seecom + marker="erts:erl"><c>.erlang</c></seecom>, <seeguide + marker="system/reference_manual:distributed"><c>.erlang.cookie</c></seeguide> + and <seeerl + marker="stdlib:beam_lib#.erlang.crypt"><c>.erlang.crypt</c></seeerl> + can now be located in the XDG Config Home directory.</p> + <p> + See the documentation for each file and + <c>filename:basedir/2</c> for more details.</p> + <p> + Own Id: OTP-17554 Aux Id: GH-5016 PR-5408 OTP-17821 </p> + </item> + <item> + <p> + Make <c>byte_size/1</c> and <c>binary_part/2/3</c> + callable from match specs (in ETS and tracing).</p> + <p> + Own Id: OTP-17555 Aux Id: PR-5027 </p> + </item> + <item> + <p> + Dynamic node name improvements: <c>erlang:is_alive/0</c> + changed to return true for pending dynamic node name and + new function <c>net_kernel:get_state/0</c>.</p> + <p> + Own Id: OTP-17558 Aux Id: OTP-17538, PR-5111, GH-5402 </p> + </item> + <item> + <p> + A new option called <c>short</c> has been added to the + functions <c>erlang:float_to_list</c> and + <c>erlang:float_to_binary</c>. This option creates the + shortest correctly rounded string representation of the + given float that can be converted back to the same float + again.</p> + <p> + Own Id: OTP-17562 Aux Id: GH-4492 </p> + </item> + <item> + <p> + The tagged tuple tests and fun-calls have been optimized + and are now a little bit cheaper than previously.</p> + <p> + These optimizations become possible after making sure + that all boxed terms have at least one word allocated + after the arity word. This has been accomplished by + letting all empty tuples refer to the same empty tuple + literal which also reduces memory usage for empty tuples.</p> + <p> + Own Id: OTP-17608</p> + </item> + <item> + <p> + The signal queue benchmark in parallel_messages_SUITE and + the ETS benchmark in ets_SUITE have benchmark result + visualization HTML pages with "fill-screen" buttons to + make the graphs bigger. This button did not work as + intended before. When pressing the button for a graph, + the last graph got replaced with a bigger version and not + the one over the button. This is now fixed.</p> + <p> + Own Id: OTP-17630</p> + </item> + <item> + <p> + The test case num_bif_SUITE:t_float_to_string previously + failed sometimes as it assumed a certain rounding of + floats printed with sprintf but the rounding type is + platform specific.</p> + <p> + Own Id: OTP-17636</p> + </item> + <item> + <p> + Optimize interpreter to create heap binaries of small + match contexts if possible.</p> + <p> + This optimization was already done in the JIT.</p> + <p> + Own Id: OTP-17660 Aux Id: PR-5164 </p> + </item> + <item> + <p> + Optimize integer multiplication for x86 JIT</p> + <p> + Own Id: OTP-17667 Aux Id: PR-5237 </p> + </item> + <item> + <p> + Removed use of node creation value zero as a wildcard. + Also prevent zero from being used as creation by + <c>erl_interface</c> and <c>jinterface</c> nodes.</p> + <p> + Own Id: OTP-17682 Aux Id: PR-5347 </p> + </item> + <item> + <p> + Distributed spawn operations now require <seeguide + marker="erts:erl_dist_protocol#DFLAG_SPAWN">distributed + <c>spawn_request()</c></seeguide> support. Distributed + <c>spawn_request()</c> was introduced in OTP 23. That is, + distributed spawn operations against Erlang nodes of + releases prior to OTP 23 will fail.</p> + <p> + *** POTENTIAL INCOMPATIBILITY ***</p> + <p> + Own Id: OTP-17683 Aux Id: PR-5306 </p> + </item> + <item> + <p>The Erlang compiler now includes type information in + BEAM files, and the JIT can now use that type information + to do optimizations such as eliminating or simplifying + type tests.</p> + <p> + Own Id: OTP-17684 Aux Id: PR-5316, PR-5664 </p> + </item> + <item> + <p>Improved the JIT's support for external tools like + <c>perf</c> and <c>gdb</c>, allowing them to show line + numbers and even the original Erlang source code when + that can be found.</p> + <p>To aid them in finding the source code, the + <c>absolute_path</c> compiler option has been added to + embed the absolute file path of a module.</p> + <p> + Own Id: OTP-17685</p> + </item> + <item> + <p> + Add [32-bit] to the Erlang shell title row for 32-bit + VMs.</p> + <p> + Own Id: OTP-17717 Aux Id: PR-5290 </p> + </item> + <item> + <p>Instructions for how to build the runtime system for + iOS/iPadOS can now be found in + <c>HOWTO/INSTALL.md</c>.</p> + <p> + Own Id: OTP-17728 Aux Id: PR-5284 </p> + </item> + <item> + <p> + Add support for static Elixir NIF modules with + non-alphanumeric characters by using new macro + <c>STATIC_ERLANG_NIF_LIBNAME</c>.</p> + <p> + Own Id: OTP-17729 Aux Id: PR-5477 </p> + </item> + <item> + <p> + Add new function <c>caller_line</c> to for trace match + specifications used by erlang:trace_pattern/3.</p> + <p> + This new option puts the line number of the caller into + the trace message sent to the trace receiver.</p> + <p> + Own Id: OTP-17753 Aux Id: PR-5305 GH-5297 </p> + </item> + <item> + <p> + A new <c>erl</c> command line argument <c>+ssrct</c> has + been introduced which will cause the runtime system to + skip reading CPU topology information. This reduce + startup time especially when the CPU topology is large. + Reading of CPU topology information is now also skipped + if a user defined CPU topology is set using the + <c>+sct</c> command line argument.</p> + <p> + Own Id: OTP-17762 Aux Id: GH-5204, PR-5219 </p> + </item> + <item> + <p> + The default time warp mode will change in Erlang/OTP 26. + Added a warning about this upcoming potential + incompatibility to the documentation.</p> + <p> + Own Id: OTP-17772 Aux Id: GH-4965 PR-5644 </p> + </item> + <item> + <p>The emulator will no longer mark unused memory as + discardable (e.g. through <c>madvise(2)</c>), as it + caused more problems than it solved.</p> + <p> + Own Id: OTP-17824</p> + </item> + <item> + <p>When a record matching or record update fails, a + <c>{badrecord,ExpectedRecordTag}</c> exception used to be + raised. In this release, the exception has been changed + to <c>{badrecord,ActualValue}</c>, where + <c>ActualValue</c> is the actual that was found instead + of the expected record.</p> + <p> + Own Id: OTP-17841 Aux Id: PR-5694 </p> + </item> + <item> + <p> + Removed the previously undocumented and unsupported + <c>emem</c> tool.</p> + <p> + Own Id: OTP-17892 Aux Id: PR-5591 </p> + </item> + <item> + <p> + Remove version number from the default install path on + Windows.</p> + <p> + Own Id: OTP-17899 Aux Id: PR-5524 </p> + </item> + <item> + <p> + On Windows apply the limit flag + JOB_OBJECT_LIMIT_BREAKAWAY_OK in the Erlang service to be + able to start a OS child process with a different session + number.</p> + <p> + Own Id: OTP-17927 Aux Id: PR-5283 </p> + </item> + <item> + <p> + An API for multihomed SCTP connect has been added in the + guise of <c>gen_sctp:connectx_init/*</c></p> + <p> + Own Id: OTP-17951 Aux Id: PR-5656 </p> + </item> + <item> + <p> + [socket] Add encoding of the field hatype of the type + sockaddr_ll (family 'packet').</p> + <p> + Own Id: OTP-17968 Aux Id: OTP-16464 </p> + </item> + <item> + <p> + A cross compilation issue has been fixed about finding + libdlpi during the configure phase.</p> + <p> + Own Id: OTP-17985 Aux Id: GH-5728 </p> + </item> + </list> + </section> + +</section> + <section><title>Erts 12.3</title> <section><title>Fixed Bugs and Malfunctions</title> |