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doc/go1.9: GC performance release notes

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Change-Id: I361587ba0ddffb5ee4a3d1bdb6219710a30da197
Reviewed-on: https://go-review.googlesource.com/45132
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Rick Hudson <rlh@golang.org>
This commit is contained in:
Austin Clements 2017-06-08 10:17:48 -04:00
parent d3d5489135
commit 385ea72410
1 changed files with 29 additions and 22 deletions
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doc/go1.9.html
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@ -152,8 +152,35 @@ type T1 = T2
<h3 id="gc">Garbage Collector</h3>
<p>
TODO(austin): give update.
<p> <!-- CL 37520 -->
Library functions that used to trigger stop-the-world garbage
collection now trigger concurrent garbage collection.
Specifically, <a href="/pkg/runtime/#GC"><code>runtime.GC</code></a>,
<a href="/pkg/runtime/debug/#SetGCPercent"><code>debug.SetGCPercent</code></a>,
and
<a href="/pkg/runtime/debug/#FreeOSMemory"><code>debug.FreeOSMemory</code></a>,
now trigger concurrent garbage collection, blocking only the calling
goroutine until the garbage collection is done.
</p>
<p> <!-- CL 34103, CL 39835 -->
The
<a href="/pkg/runtime/debug/#SetGCPercent"><code>debug.SetGCPercent</code></a>
function only triggers a garbage collection if one is immediately
necessary because of the new GOGC value.
This makes it possible to adjust GOGC on-the-fly.
</p>
<p> <!-- CL 38732 -->
Large object allocation performance is significantly improved in
applications using large (&gt;50GB) heaps containing many large
objects.
</p>
<p> <!-- CL 34937 -->
The <a href="/pkg/runtime/#ReadMemStats"><code>runtime.ReadMemStats</code></a>
function now takes less than 100µs even for very large heaps.
</p>
<h2 id="library">Core library</h2>
@ -482,10 +509,6 @@ type T1 = T2
TODO: <a href="https://golang.org/cl/29341">https://golang.org/cl/29341</a>: use cpuset_getaffinity for runtime.NumCPU() on FreeBSD
</p>
<p><!-- CL 34937 -->
TODO: <a href="https://golang.org/cl/34937">https://golang.org/cl/34937</a>: make ReadMemStats STW for &lt; 25µs
</p>
<p><!-- CL 35710 -->
TODO: <a href="https://golang.org/cl/35710">https://golang.org/cl/35710</a>: make time correctly update on Wine
</p>
@ -498,10 +521,6 @@ type T1 = T2
TODO: <a href="https://golang.org/cl/37441">https://golang.org/cl/37441</a>: make complex division c99 compatible
</p>
<p><!-- CL 37520 -->
TODO: <a href="https://golang.org/cl/37520">https://golang.org/cl/37520</a>: make runtime.GC() trigger a concurrent GC
</p>
<p><!-- CL 37726 -->
TODO: <a href="https://golang.org/cl/37726">https://golang.org/cl/37726</a>: strongly encourage CallersFrames with the result of Callers
</p>
@ -520,18 +539,6 @@ type T1 = T2
</dl><!-- runtime -->
<dl id="runtime/debug"><dt><a href="/pkg/runtime/debug/">runtime/debug</a></dt>
<dd>
<p><!-- CL 34013 -->
TODO: <a href="https://golang.org/cl/34013">https://golang.org/cl/34013</a>: don&#39;t run a GC when setting SetGCPercent negative
</p>
<p><!-- CL 39835 -->
TODO: <a href="https://golang.org/cl/39835">https://golang.org/cl/39835</a>: don&#39;t trigger a GC on SetGCPercent
</p>
</dl><!-- runtime/debug -->
<dl id="runtime/pprof"><dt><a href="/pkg/runtime/pprof/">runtime/pprof</a></dt>
<dd>
<p><!-- CL 34198 -->