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diff --git a/erts/doc/src/notes.xml b/erts/doc/src/notes.xml index d7967212b1..6b6a3374d1 100644 --- a/erts/doc/src/notes.xml +++ b/erts/doc/src/notes.xml @@ -30,6 +30,262 @@ </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> + <list> + <item> + <p><c>erlang:system_profile</c> errorneous profiled the + profiler process when observing runnable processes. This + has been corrected. </p> + <p> + Own Id: OTP-9849</p> + </item> + <item> + <p>Calling trace_info/2 asking for information about a + function that had native could could crash the run-time + system.</p> + <p> + Own Id: OTP-9886</p> + </item> + <item> + <p> + reduce smp locking time range in erts_garbage_collect + (thanks to Jovi Zhang)</p> + <p> + Own Id: OTP-9912</p> + </item> + <item> + <p> + Fix typo in supervisor behaviour doc (Thanks to Ricardo + Catalinas Jim�nez)</p> + <p> + Own Id: OTP-9924</p> + </item> + <item> + <p> + Correct spelling of registered (Thanks to Richard + Carlsson)</p> + <p> + Own Id: OTP-9925</p> + </item> + <item> + <p> + erts: Remove unused variable (Thanks to Jovi Zhang)</p> + <p> + Own Id: OTP-9926</p> + </item> + <item> + <p> + Fix bug in ETS with <c>compressed</c> option and + insertion of term containing large integers (>2G) on + 64-bit machines. Seen to cause emulator crash. (Thanks to + Diego Llarrull for excellent bug report)</p> + <p> + Own Id: OTP-9932</p> + </item> + <item> + <p> + Handle Linux OS where /sys/devices/system/node is only + readable by root. Fallback to /sys/devices/system/cpu for + topology info.</p> + <p> + Own Id: OTP-9978</p> + </item> + <item> + <p> When an escript ends now all printout to standard + output and standard error gets out on the terminal. This + bug has been corrected by changing the behaviour of + erlang:halt/0,1, which should fix the same problem for + other escript-like applications, i.e that data stored in + the output port driver buffers got lost when printing on + a TTY and exiting through erlang:halt/0,1. </p> + <p> The BIF:s erlang:halt/0,1 has gotten improved + semantics and there is a new BIF erlang:halt/2 to + accomplish something like the old semantics. See the + documentation. </p> + <p> Now erlang:halt/0 and erlang:halt/1 with an integer + argument will close all ports and allow all pending async + threads operations to finish before exiting the emulator. + Previously erlang:halt/0 and erlang:halt(0) would just + wait for pending async threads operations but not close + ports. And erlang:halt/1 with a non-zero integer argument + would not even wait for pending async threads operations. + </p> + <p> To roughly the old behaviour, to not wait for ports + and async threads operations when you exit the emulator, + you use erlang:halt/2 with an integer first argument and + an option list containing {flush,false} as the second + argument. Note that now is flushing not dependant of the + exit code, and you can not only flush async threads + operations which we deemed as a strange behaviour anyway. + </p> + <p>Also, erlang:halt/1,2 has gotten a new feature: If the + first argument is the atom 'abort' the emulator is + aborted producing a core dump, if the operating system so + allows. </p> + <p> + Own Id: OTP-9985</p> + </item> + <item> + <p> + Added check to inet driver to avoid building on operating + systems that do not yet have IPv6 compatible socket API. + (Thanks to Peer Stritzinger)</p> + <p> + Own Id: OTP-9996</p> + </item> + <item> + <p> + Fix bug when the number of CPUs actually found is lower + than the configured value. (Thanks to Benjamin + Herrenschmidt)</p> + <p> + Own Id: OTP-10004</p> + </item> + <item> + <p> + The runtime system without SMP support and without thread + support erroneously busy waited when no work was present. + This bug first appeared in <c>erts-5.9</c>.</p> + <p> + Own Id: OTP-10019</p> + </item> + <item> + <p> + Various typographical errors corrected in documentation + for common_test, driver, erl_driver and windows + installation instructions. (Thanks to Tuncer Ayaz)</p> + <p> + Own Id: OTP-10037</p> + </item> + <item> + <p> + Fix memory leak caused by race on exiting process</p> + <p> + Own Id: OTP-10041</p> + </item> + </list> + </section> + + + <section><title>Improvements and New Features</title> + <list> + <item> + <p>Add <c>erlang:statistics(scheduler_wall_time)</c> to + ensure correct determination of scheduler utilization. + Measuring scheduler utilization is strongly preferred + over CPU utilization, since CPU utilization gives very + poor indications of actual scheduler/vm usage.</p> + <p> + Own Id: OTP-9858</p> + </item> + <item> + <p> + ERTS internal API improvements. In some cases the amount + of atomic read operations needed have been reduced due to + this.</p> + <p> + Own Id: OTP-9922</p> + </item> + <item> + <p> + The DTrace source patch from Scott Lystig Fritchie is + integrated in the source tree. Using an emulator with + dtrace probe is still not supported for production use, + but may be a valuable debugging tool. Configure with + --with-dynamic-trace=dtrace (or + --with-dynamic-trace=systemtap) to create a build with + dtrace probes enabled. See runtime_tools for + documentation and examples.</p> + <p> + Own Id: OTP-10017</p> + </item> + </list> + </section> + + + <section><title>Known Bugs and Problems</title> + <list> + <item> + <p> + enif_make_copy may invalidate enif_inspect_binary.</p> + <p> + Own Id: OTP-9828</p> + </item> + </list> + </section> + +</section> + <section><title>Erts 5.9.0.1</title> <section><title>Fixed Bugs and Malfunctions</title> |