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44106a0880
There was a number of improvements related to GC parallelization: 1. Parallel roots/stacks scanning. 2. Parallel stack shrinking. 3. Per-thread workbuf caches. 4. Workset reduction. Currently 32 threads work well. go.benchmarks:garbage benchmark on 2 x Intel Xeon E5-2690 (16 HT cores) 1 thread/1 processor: time=16405255 cputime=16386223 gc-pause-one=546793975 gc-pause-total=3280763 2 threads/1 processor: time=9043497 cputime=18075822 gc-pause-one=331116489 gc-pause-total=2152257 4 threads/1 processor: time=4882030 cputime=19421337 gc-pause-one=174543105 gc-pause-total=1134530 8 threads/1 processor: time=4134757 cputime=20097075 gc-pause-one=158680588 gc-pause-total=1015555 16 threads/1 processor + HT: time=2006706 cputime=31960509 gc-pause-one=75425744 gc-pause-total=460097 16 threads/2 processors: time=1513373 cputime=23805571 gc-pause-one=56630946 gc-pause-total=345448 32 threads/2 processors + HT: time=1199312 cputime=37592764 gc-pause-one=48945064 gc-pause-total=278986 LGTM=rlh R=golang-codereviews, tracey.brendan, rlh CC=golang-codereviews, khr, rsc https://golang.org/cl/123920043 |
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This is the source code repository for the Go programming language.
For documentation about how to install and use Go,
visit http://golang.org/ or load doc/install-source.html
in your web browser.
After installing Go, you can view a nicely formatted
doc/install-source.html by running godoc --http=:6060
and then visiting http://localhost:6060/doc/install/source.
Unless otherwise noted, the Go source files are distributed
under the BSD-style license found in the LICENSE file.
--
Binary Distribution Notes
If you have just untarred a binary Go distribution, you need to set
the environment variable $GOROOT to the full path of the go
directory (the one containing this README). You can omit the
variable if you unpack it into /usr/local/go, or if you rebuild
from sources by running all.bash (see doc/install.html).
You should also add the Go binary directory $GOROOT/bin
to your shell's path.
For example, if you extracted the tar file into $HOME/go, you might
put the following in your .profile:
export GOROOT=$HOME/go
export PATH=$PATH:$GOROOT/bin
See doc/install.html for more details.