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</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>
+ <list>
+ <item>
+ <p>
+ A feature test for the <c>lwsync</c> instruction
+ performed on PowerPC hardware at runtime system startup
+ got into an eternal loop if the instruction was not
+ supported. This bug was introduced in erts-5.9/OTP-R15B.</p>
+ <p>
+ Own Id: OTP-9843</p>
+ </item>
+ <item>
+ <p>
+ I/O events could potentially be delayed for ever when
+ enabling kernel-poll on a non-SMP runtime system
+ executing on Solaris. When also combined with
+ async-threads the runtime system hung before completing
+ the boot phase. This bug was introduced in
+ erts-5.9/OTP-R15B.</p>
+ <p>
+ Own Id: OTP-9844</p>
+ </item>
+ </list>
+ </section>
+
+</section>
+
<section><title>Erts 5.9</title>
<section><title>Fixed Bugs and Malfunctions</title>