diff options
Diffstat (limited to 'erts/doc/src')
| -rw-r--r-- | erts/doc/src/notes.xml | 363 |
1 files changed, 363 insertions, 0 deletions
diff --git a/erts/doc/src/notes.xml b/erts/doc/src/notes.xml index 2bea23ba88..9920dc3c45 100644 --- a/erts/doc/src/notes.xml +++ b/erts/doc/src/notes.xml @@ -30,6 +30,369 @@ </header> <p>This document describes the changes made to the ERTS application.</p> +<section><title>Erts 5.10.2</title> + + <section><title>Fixed Bugs and Malfunctions</title> + <list> + <item> + <p> + A bug in prim_inet has been corrected. If the port owner + was killed at a bad time while closing the socket port + the port could become orphaned hence causing port and + socket leaking. Reported by Fred Herbert, Dmitry Belyaev + and others.</p> + <p> + Own Id: OTP-10497 Aux Id: OTP-10562 </p> + </item> + <item> + <p> + Compilation fixes for NetBSD. Thanks to YAMAMOTO Takashi.</p> + <p> + Own Id: OTP-10941</p> + </item> + <item> + <p> + Fixed a race condition when using delayed_write when + writing to a file which would cause the same data to be + written multiple times.</p> + <p> + Own Id: OTP-10984</p> + </item> + <item> + <p> + Fix small memory leak from tracing with option + <c>meta</c>.</p> + <p> + Own Id: OTP-10997</p> + </item> + <item> + <p> + Correct typo in erlsrv usage. Thanks to Bryan Hunter</p> + <p> + Own Id: OTP-11002</p> + </item> + <item> + <p> + ct_run: delete unused function. Thanks to Tuncer Ayaz.</p> + <p> + Own Id: OTP-11003</p> + </item> + <item> + <p> + Corrections to run_erl/to_erl handshake behaviour.</p> + <p> + Own Id: OTP-11012</p> + </item> + <item> + <p> + Fix typo in type: erlang:process_info_item(). Thanks to + Andrew Tunnell-Jones.</p> + <p> + Own Id: OTP-11024</p> + </item> + <item> + <p> + Fix src/dest overlap issue in ttsl driver. Thanks to + Steve Vinoski.</p> + <p> + Own Id: OTP-11064</p> + </item> + <item> + <p> + When sending to a port using <c>erlang:send(Port, Msg, + [nosuspend])</c>, the send operation was performed + synchronously. This bug has now been fixed.</p> + <p> + Own Id: OTP-11076 Aux Id: OTP-10336 </p> + </item> + <item> + <p> + When converting a faulty binary to a list with + unicode:characters_to_list, the error return value could + contain a faulty "rest", i.e. the io_list of characters + that could not be converted was wrong. This happened only + if input was a sub binary and conversion was from utf8. + This is now corrected.</p> + <p> + Own Id: OTP-11080</p> + </item> + <item> + <p> + Runtime system could crash when reporting stale + <c>driver_select()</c>.</p> + <p> + Own Id: OTP-11084</p> + </item> + <item> + <p> + Fix lock order violation for memory instrumentation + (+Mim, +Mis, +Mit).</p> + <p> + Own Id: OTP-11085</p> + </item> + <item> + <p> + Fixed some compilation warnings on miscellaneous + platforms. Thanks to Anthony Ramine.</p> + <p> + Own Id: OTP-11086</p> + </item> + <item> + <p> + Fixed issue when flushing i/o during shutdown on windows + where the Erlang VM would sometime hang due to a race + condition.</p> + <p> + Own Id: OTP-11096</p> + </item> + <item> + <p> + Fixed issue where repeated calls to erlang:nodes() could + cause unnecessary contention in the dist_table lock.</p> + <p> + Own Id: OTP-11097</p> + </item> + <item> + <p> + Properly guard WIDE_TAG use with HAVE_WCWIDTH in + ttsl_drv. Thanks to Anthony Ramine</p> + <p> + Own Id: OTP-11106</p> + </item> + <item> + <p> + Fix some Makefile rules that didn't support silent rules. + Thanks to Anthony Ramine.</p> + <p> + Own Id: OTP-11111</p> + </item> + <item> + <p> + Fix receive support in erl_eval with a BEAM module. + Thanks to Anthony Ramine.</p> + <p> + Own Id: OTP-11137</p> + </item> + <item> + <p> + erlang:now() could suddenly jump ~24 days into the future + on Windows. This is now corrected. Thanks to Garret Smith + for reporting and testing fixes.</p> + <p> + Own Id: OTP-11146</p> + </item> + <item> + <p> + erlang:term_to_binary will now cost an appropriate amount + of reductions and will interrupt (yield) for reschedule + if the term is big. This avoids too long schedules when + term_to_binary is used. </p> + <p> + Impact: Programs running term_to_binary on large terms + will run more smothly, but rescheduling will impact the + single process performance of the BIF. Single threaded + benchmarks will show degraded performance of the BIF when + called with very large terms, while general system + behaviour will be improved. The overhead for allowing + restart and reduction counting also degrades local + performance of the BIF with between 5% and 10% even for + small terms.</p> + <p> + Own Id: OTP-11163</p> + </item> + </list> + </section> + + + <section><title>Improvements and New Features</title> + <list> + <item> + <p> + Replaced the lock protecting gathering of garbage + collection statistics with a lock-free solution.</p> + <p> + Own Id: OTP-10271 Aux Id: kunagi-108 + [04c5410f-9cc4-4696-8639-36bf98686c7a-7] </p> + </item> + <item> + <p>Support for migration of memory carriers between + memory allocator instances has been introduced.</p> + <p>By default this feature is not enabled and do not + effect the characteristics of the system. When enabled it + has the following impact on the characteristics of the + system:</p> <list> <item>Reduced memory footprint when + the memory load is unevenly distributed between scheduler + specific allocator instances.</item> <item>Depending on + the default allocaton strategy used on a specific + allocator there might or might not be a slight + performance loss.</item> <item>When enabled on the + <c>fix_alloc</c> allocator, a different strategy for + management of fix blocks will be used.</item> <item>The + information returned from <seealso + marker="erlang:system_info_allocator_tuple"><c>erlang:system_info({allocator, + A})</c></seealso>, and <seealso + marker="erlang:system_info_allocator_sizes"><c>erlang:system_info({allocator_sizes, + A})</c></seealso> will be slightly different when this + feature has been enabled. An <c>mbcs_pool</c> tuple will + be present giving information about abandoned carriers, + and in the <c>fix_alloc</c> case no <c>fix_types</c> + tuple will be present. </item></list> + <p>For more information, see the documentation of the + <seealso + marker="erts_alloc#M_acul"><c>+M<S>acul</c></seealso> + command line argument.</p> + <p> + Own Id: OTP-10279</p> + </item> + <item> + <p> + Change specs for spawn_opt to use the process_level() + type declaration instead of re-defining it in various + places. Thanks to Kostis Sagonas.</p> + <p> + Own Id: OTP-11008</p> + </item> + <item> + <p> Postscript files no longer needed for the generation + of PDF files have been removed. </p> + <p> + Own Id: OTP-11016</p> + </item> + <item> + <p>Erlang source files with non-ASCII characters are now + encoded in UTF-8 (instead of latin1).</p> + <p> + Own Id: OTP-11041 Aux Id: OTP-10907 </p> + </item> + <item> + <p> + Optimization of simultaneous <c>inet_db</c> operations on + the same socket by using a lock free implementation.</p> + <p> + Impact on the characteristics of the system: Improved + performance.</p> + <p> + Own Id: OTP-11074</p> + </item> + <item> + <p> + The <c>high_msgq_watermark</c> and + <c>low_msgq_watermark</c> <c>inet</c> socket options + introduced in OTP-R16A could only be set on TCP sockets. + These options are now generic and can be set on all types + of sockets.</p> + <p> + Own Id: OTP-11075 Aux Id: OTP-10336 </p> + </item> + <item> + <p>A new better algorithm for management of the process, + and port tables has been introduced.</p> + <p>Impact on the characteristics of the system:</p> + <list> <item>The new algorithm ensures that both insert + and delete operations can be made in O(1) time + complexity. Previously used algorithm either caused + insert or delete to be O(N).</item> <item>The new + algorithm will also ensure that reuse of identifiers will + be less frequent than when the old algorithm was + used.</item> <item>Previously used algorithm ensured that + the latest created identifier compared as the largest + when comparing two identifiers of the same type that had + been created on the same node as long as no identifiers + had been reused. Since identifiers can be reused quite + fast, one has never been able to rely on this property. + Due to the introduction of this new algorithm this + property will not hold even if no identifiers has been + reused yet. This could be considered as an + incompatibility.</item> </list> + <p>Due to the above mensioned potential incompatibility, + it will still be possible to enable the old algorithm for + some time. The command line argument <seealso + marker="erl#+P"><c>+P legacy</c></seealso> will enable + the old algorithm on the process table, and <seealso + marker="erl#+Q"><c>+Q legacy</c></seealso> will do the + same for the port table. These command line arguments are + however deprecated as of their introduction and have been + scheduled for removal in OTP-R18.</p> + <p> + *** POTENTIAL INCOMPATIBILITY ***</p> + <p> + Own Id: OTP-11077</p> + </item> + <item> + <p> + Support wide characters in the shell through wcwidth(). + Thanks to Anthony Ramine. Reported by Lo�c Hoguin.</p> + <p> + Own Id: OTP-11088</p> + </item> + <item> + <p> + Added total used memory for each process in erlang crash + dumps.</p> + <p> + Own Id: OTP-11098</p> + </item> + <item> + <p> + Added support for hipe on Raspberry Pi (armv6l). Thanks + to Klaus Alfert.</p> + <p> + Own Id: OTP-11125</p> + </item> + <item> + <p> + Remove 'query' from the list of reserved words in docs. + Thanks to Matthias Endler and Lo�c Hoguin.</p> + <p> + Own Id: OTP-11158</p> + </item> + <item> + <p> + Lift static limitation (FD_SETSIZE) for file descriptors + on Mac OS X. (Thanks to Anthony Ramine)</p> + <p> + Own Id: OTP-11159</p> + </item> + </list> + </section> + + + <section><title>Known Bugs and Problems</title> + <list> + <item> + <p>Miscellaneous native code in OTP misbehave either due + to lengthy execution, or due to not bumping reductions + properly. Problems typically occur when passing huge sets + of data to a misbehaving BIF. Fixing this has high + priority and is being worked on, but there will remain + issues like this for some time.</p> + <p>In order to alleviate problems with scheduling which + might occur when executing misbehaving native code, the + command line argument <seealso + marker="erl#+sfwi">+sfwi</seealso> has been + introduced.</p> + <p>By default this feature is disabled and you are + advised not to enable it if you do not encounter problems + with misbehaving native code.</p> + <p>When enabled it has the following impact on the + characteristics of the system:</p> <list> <item>Work will + always be distributed between schedulers even when + executing misbehaving native code.</item> <item>It may + cause an increased amount of processes and/or ports + bouncing between schedulers which in turn will cause a + performance loss.</item> <item>It may cause reduced + performance due to reduced or lost work compaction when + all schedulers do not execute under full load.</item> + <item>An increased contention on run queue locks.</item> + </list> + <p> + Own Id: OTP-11164</p> + </item> + </list> + </section> + +</section> + <section><title>Erts 5.10.1.2</title> <section><title>Fixed Bugs and Malfunctions</title> |