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diff --git a/lib/stdlib/doc/src/notes.xml b/lib/stdlib/doc/src/notes.xml index 90e9827ec8..65650a25c7 100644 --- a/lib/stdlib/doc/src/notes.xml +++ b/lib/stdlib/doc/src/notes.xml @@ -31,231 +31,6 @@ </header> <p>This document describes the changes made to the STDLIB application.</p> -<section><title>STDLIB 3.9</title> - - <section><title>Fixed Bugs and Malfunctions</title> - <list> - <item> - <p> Fix a bug in <c>string:lexemes/2</c>. </p> <p> The - bug was found when optimizing the handling of deep lists - of Unicode characters in the <c>string</c> module. </p> - <p> - Own Id: OTP-15649</p> - </item> - <item> - <p>A bug has been fixed in the <c>maps</c> 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 <c>K1</c> - containing a binary <c>B1</c> into a map <c>M</c> having - a key <c>K2</c> with a binary <c>B2</c> if the following - conditions were met:</p> <list> <item><c>B1 =/= - B2</c></item> <item><c>size(B1) >= 4294967296</c></item> - <item><c>size(B2) >= 4294967296</c></item> - <item><c>size(M) >= 32</c></item> <item><c>(size(B1) rem - 4294967296) == (size(B2) rem 4294967296)</c></item> - <item>the first <c>(size(B1) rem 4294967296)</c> bytes - are the same both in <c>B1</c> and <c>B2</c></item> - <item>substituting <c>B1</c> in <c>K1</c> with <c>B2</c> - would create a term with the same value as - <c>K2</c></item> </list> <p>The root cause of the problem - is that the <c>maps</c> implementation only hashed the - first <c>(X rem 4294967296)</c> bytes of binaries so that - different binaries could get the same hash value - independently of the hash seed.</p> - <p> - Own Id: OTP-15707</p> - </item> - <item> - <p> Since the introduction of the stack trace variable, - the Erlang Pretty Printer has left out the exception - class <c>throw</c> 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 - <c>throw</c>. </p> - <p> - Own Id: OTP-15751</p> - </item> - <item> - <p><c>record_info/2</c> is a pseudo-function that - requires literal arguments known at compile time. - Therefore, the following usage is illegal: <c>fun - record/info/2</c>. The compiler would crash when during - compilation of that kind of code. Corrected to issue a - compilation error.</p> - <p> - Own Id: OTP-15760 Aux Id: ERL-907 </p> - </item> - </list> - </section> - - - <section><title>Improvements and New Features</title> - <list> - <item> - <p> A new <c>rand</c> module algorithm, <c>exro928ss</c> - (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. </p><p> The same generator is also - used as a long period counter in a new <c>crypto</c> - plugin for the <c>rand</c> module, algorithm - <c>crypto_aes</c>. 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). </p> - <p> - Own Id: OTP-14461 Aux Id: PR-1857 </p> - </item> - <item> - <p> - Types related to server naming and starting have been - exported from <c>gen_statem</c>. These are: - <c>server_name/0</c>, <c>server_ref/0</c>, - <c>start_opt/0</c>, <c>start_ret/0</c> and - <c>enter_loop_opt/0</c>.</p> - <p> - Own Id: OTP-14724 Aux Id: PR-2056 </p> - </item> - <item> - <p> - The default algorithm for the <c>rand</c> module has been - changed to <c>exsss</c> (Xorshift116**) which is a - combination of the Xorshift116 (<c>exsp</c>) 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.</p> - <p> - Own Id: OTP-14731 Aux Id: PR-1969 </p> - </item> - <item> - <p> - The generic state machine behaviour <c>gen_statem</c> has - gotten code cleanup and documentation improvements from - GitHub Pull Request #1855, even though the PR itself was - rejected.</p> - <p> - Own Id: OTP-14737 Aux Id: PR-1855 </p> - </item> - <item> - <p> - Update Unicode specification to version 11.0.</p> - <p> - Own Id: OTP-15111</p> - </item> - <item> - <p> - ETS option <c>write_concurrency</c> now also affects and - improves the scalability of <c>ordered_set</c> 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.</p> - <p> - Own Id: OTP-15128</p> - </item> - <item> - <p> - Optimized <c>maps:new/0</c> with trivial Erlang - implementation, making use of literal terms (the empty - map) not needing dynamic heap allocation.</p> - <p> - Own Id: OTP-15200 Aux Id: PR-1878 </p> - </item> - <item> - <p>The <c>gen_*</c> behaviours have been changed so that - if logging of the last N messages through - <c>sys:log/2,3</c> is active for the server, this log is - included in the terminate report.</p> <p>To accomplish - this the format of "System Events" as defined in the man - page for <c>sys</c> has been clarified and cleaned up, a - new function <c>sys:get_log/1</c> has been added, and - <c>sys:get_debug/3</c> has been deprecated. Due to these - changes, code that relies on the internal badly - documented format of "System Events", need to be - corrected.</p> - <p> - *** POTENTIAL INCOMPATIBILITY ***</p> - <p> - Own Id: OTP-15381</p> - </item> - <item> - <p> - The <c>gen_statem</c> 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.</p> - <p> - Own Id: OTP-15452</p> - </item> - <item> - <p> - The <c>persistent_term</c> functions <c>put/2</c> and - <c>erase/1</c> are now yeliding.</p> - <p> - Own Id: OTP-15615</p> - </item> - <item> - <p>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 <c>ordered_set</c> with - <c>write_concurrency</c> enabled use the decentralized - counter. Experiments indicate that this change - substantially improves the scalability of ETS - <c>ordered_set</c> tables with <c>write_concurrency</c> - enabled in scenarios with frequent <c>ets:insert/2</c> - and <c>ets:delete/2</c> calls.</p> - <p> - Own Id: OTP-15623 Aux Id: PR-2190 </p> - </item> - <item> - <p> Use <c>ssh</c> instead of <c>rsh</c> as the default - remote shell. </p> - <p> - Own Id: OTP-15633 Aux Id: PR-1787 </p> - </item> - <item> - <p>Added <c>beam_lib:strip/2</c> and friends, which - accept a list of chunks that should be preserved when - stripping.</p> - <p> - Own Id: OTP-15680 Aux Id: PR-2114 </p> - </item> - <item> - <p> There are new compiler options <c>nowarn_removed</c> - and <c>{nowarn_removed,Items}</c> to suppress warnings - for functions and modules that have been removed from - OTP.</p> - <p> - Own Id: OTP-15749 Aux Id: ERL-904 </p> - </item> - <item> - <p> Let the Erlang Pretty Printer put atomic parts on the - same line. </p> - <p> - Own Id: OTP-15755</p> - </item> - <item> - <p> Add option <c>quote_singleton_atom_types</c> to the - Erlang Pretty Printer's functions. Setting the option to - <c>true</c> adds quotes to all singleton atom types. </p> - <p> - Own Id: OTP-15756</p> - </item> - </list> - </section> - -</section> - <section><title>STDLIB 3.8.1</title> <section><title>Fixed Bugs and Malfunctions</title> |