diff options
Diffstat (limited to 'erts/doc/src')
| -rw-r--r-- | erts/doc/src/erl.xml | 21 | ||||
| -rw-r--r-- | erts/doc/src/notes.xml | 68 |
2 files changed, 89 insertions, 0 deletions
diff --git a/erts/doc/src/erl.xml b/erts/doc/src/erl.xml index 4ef3e089a6..16f5205b29 100644 --- a/erts/doc/src/erl.xml +++ b/erts/doc/src/erl.xml @@ -768,6 +768,16 @@ <seealso marker="erlang#system_info_scheduler_bindings">erlang:system_info(scheduler_bindings)</seealso>. </p> </item> + <tag><marker id="+sbwt"><c>+sbwt none|very_short|short|medium|long|very_long</c></marker></tag> + <item> + <p>Set scheduler busy wait threshold. Default is <c>medium</c>. + The threshold determines how long schedulers should busy + wait when running out of work before going to sleep. + </p> + <p><em>NOTE:</em> This flag may be removed or changed at any time + without prior notice. + </p> + </item> <tag><marker id="+scl"><c>+scl true|false</c></marker></tag> <item> <p>Enable or disable scheduler compaction of load. By default @@ -903,6 +913,17 @@ <p>For more information, see <seealso marker="erlang#system_info_cpu_topology">erlang:system_info(cpu_topology)</seealso>.</p> </item> + <tag><marker id="+sws"><c>+sws default|legacy|proposal</c></marker></tag> + <item> + <p>Set scheduler wakeup strategy. Default is <c>legacy</c> (has been + used since OTP-R13B). The <c>proposal</c> strategy is the currently + proposed strategy for OTP-R16. Note that the <c>proposal</c> strategy + might change during OTP-R15. + </p> + <p><em>NOTE:</em> This flag may be removed or changed at any time + without prior notice. + </p> + </item> <tag><marker id="+swt"><c>+swt very_low|low|medium|high|very_high</c></marker></tag> <item> <p>Set scheduler wakeup threshold. Default is <c>medium</c>. diff --git a/erts/doc/src/notes.xml b/erts/doc/src/notes.xml index 028a2bbf3d..6b6a3374d1 100644 --- a/erts/doc/src/notes.xml +++ b/erts/doc/src/notes.xml @@ -30,6 +30,74 @@ </header> <p>This document describes the changes made to the ERTS application.</p> +<section><title>Erts 5.9.1.1</title> + + <section><title>Fixed Bugs and Malfunctions</title> + <list> + <item> + <p> + If threads support for the runtime system had been + disabled at compile time (<c>--disable-threads</c> had + been passed to <c>configure</c>), and the <c>+A</c> + command line argument of <c>erl</c> was passed when + starting the runtime system, <seealso + marker="erl_driver#driver_system_info">driver_system_info()</seealso> + erroneously claimed that the runtime system had async + threads even though it had not.</p> + <p> + Due to this bug the file driver did not split tasks into + smaller chunks, but instead completed the whole task at + once, i.e., the scheduler got occupied with I/O for a + longer time than intended.</p> + <p> + Own Id: OTP-10059</p> + </item> + </list> + </section> + + + <section><title>Improvements and New Features</title> + <list> + <item> + <p> + A proposal for a new scheduler wakeup strategy has been + implemented. For more information see the documentation + of the <seealso marker="erl#+sws">+sws</seealso> command + line argument of <c>erl</c>.</p> + <p> + Own Id: OTP-10033 Aux Id: Seq12025 </p> + </item> + <item> + <p> + A switch for configuration of busy wait length for + scheduler threads has been added. For more information + see the documentation of the <seealso + marker="erl#+sbwt">+sbwt</seealso> command line argument + of <c>erl</c>.</p> + <p> + Own Id: OTP-10044 Aux Id: Seq11976 </p> + </item> + <item> + <p> + The extra memory barriers introduced by bug-fix OTP-9281 + were unnecessarily used also on tables without the + <c>write_concurrency</c> option enabled. This could + unnecessarily degrade performance of ETS tables without + <c>write_concurrency</c> on some hardware (e.g. PowerPC) + while not effecting performance at all on other hardware + (e.g. x86/x86_64).</p> + <p> + OTP-9281 (R14B03): ETS tables using the + <c>write_concurrency</c> option could potentially get + into an internally inconsistent state.</p> + <p> + Own Id: OTP-10048 Aux Id: OTP-9281 </p> + </item> + </list> + </section> + +</section> + <section><title>Erts 5.9.1</title> <section><title>Fixed Bugs and Malfunctions</title> |