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authorErlang/OTP <[email protected]>2016-05-11 17:22:23 +0200
committerErlang/OTP <[email protected]>2016-05-11 17:22:23 +0200
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<p>This document describes the changes made to the Runtime_Tools
application.</p>
+<section><title>Runtime_Tools 1.10</title>
+
+ <section><title>Improvements and New Features</title>
+ <list>
+ <item>
+ <p>
+ Add microstate accounting</p>
+ <p>
+ Microstate accounting is a way to track which state the
+ different threads within ERTS are in. The main usage area
+ is to pin point performance bottlenecks by checking which
+ states the threads are in and then from there figuring
+ out why and where to optimize.</p>
+ <p>
+ Since checking whether microstate accounting is on or off
+ is relatively expensive only a few of the states are
+ enabled by default and more states can be enabled through
+ configure.</p>
+ <p>
+ There is a convinence module called msacc that has been
+ added to runtime_tools that can assist in gathering and
+ interpreting the data from Microstate accounting.</p>
+ <p>
+ For more information see <seealso
+ marker="erts:erlang#statistics_microstate_accounting">erlang:statistics(microstate_accounting,
+ _)</seealso> and the <seealso
+ marker="runtime_tools:msacc">msacc</seealso> module in
+ runtime_tools.</p>
+ <p>
+ Own Id: OTP-12345</p>
+ </item>
+ <item>
+ <p>
+ Update dbg and ttb to work with a tracer module as tracer
+ and tracing on ports.</p>
+ <p>
+ Own Id: OTP-13500</p>
+ </item>
+ <item>
+ <p>
+ Updated dbg to accept the new trace options
+ <c>monotonic_timestamp</c> and
+ <c>strict_monotonic_timestamp</c>.</p>
+ <p>
+ Own Id: OTP-13502</p>
+ </item>
+ <item>
+ <p>
+ Introduce LTTng tracing via Erlang tracing.</p>
+ <p>
+ For LTTng to be enabled OTP needs to be built with
+ configure option <c>--with-dynamic-trace=lttng</c>.</p>
+ <p>The dynamic trace module <c>dyntrace</c> is now
+ capable to be used as a LTTng sink for Erlang tracing.
+ For a list of all tracepoints, see <seealso
+ marker="runtime_tools:LTTng">Runtime Tools User's
+ Guide</seealso> .</p>
+ <p>This feature also introduces an incompatible change in
+ trace tags. The trace tags <c>gc_start</c> and
+ <c>gc_end</c> has been split into <c>gc_minor_start</c>,
+ <c>gc_minor_end</c> and <c>gc_major_start</c>,
+ <c>gc_major_end</c>.</p>
+ <p>
+ *** POTENTIAL INCOMPATIBILITY ***</p>
+ <p>
+ Own Id: OTP-13532</p>
+ </item>
+ </list>
+ </section>
+
+</section>
+
<section><title>Runtime_Tools 1.9.3</title>
<section><title>Improvements and New Features</title>