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Diffstat (limited to 'lib/stdlib/doc')
| -rw-r--r-- | lib/stdlib/doc/src/notes.xml | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/lib/stdlib/doc/src/notes.xml b/lib/stdlib/doc/src/notes.xml index 23c3f6e981..ea90482b25 100644 --- a/lib/stdlib/doc/src/notes.xml +++ b/lib/stdlib/doc/src/notes.xml @@ -31,6 +31,142 @@ </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> + </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> 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> + </list> + </section> + +</section> + <section><title>STDLIB 3.8</title> <section><title>Fixed Bugs and Malfunctions</title> |