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The Go programming language
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Currently we do the following dance after sweeping a span: 1. lock mcentral 2. remove the span from a list 3. unlock mcentral 4. unmark span 5. lock mheap 6. insert the span into heap 7. unlock mheap 8. lock mcentral 9. observe empty list 10. unlock mcentral 11. lock mheap 12. grab the span 13. unlock mheap 14. mark span 15. lock mcentral 16. insert the span into empty list 17. unlock mcentral This change short-circuits this sequence to nothing, that is, we just cache and use the span after sweeping. This gives us functionality similar (even better) to tcmalloc's transfer cache. benchmark old ns/op new ns/op delta BenchmarkMalloc8 22.2 19.5 -12.16% BenchmarkMalloc16 31.0 26.6 -14.19% LGTM=khr R=golang-codereviews, khr CC=golang-codereviews, rlh, rsc https://golang.org/cl/119550043 |
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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.