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The Go programming language
32fef9908a
runtime.newproc/ready are deliberately sloppy about waking new M's, they only ensure that there is at least 1 spinning M. Currently to compensate for that, schedule() checks if the current P has local work and there are no spinning M's, it wakes up another one. It does not work if goroutines do not call schedule. With this change a spinning M wakes up another M when it finds work to do. It's also not ideal, but it fixes the underutilization. A proper check would require to know the exact number of runnable G's, but it's too expensive to maintain. Fixes #5586. This is reincarnation of cl/9776044 with the bug fixed. The bug was due to code added after cl/9776044 was created: if(tick - (((uint64)tick*0x4325c53fu)>>36)*61 == 0 && runtime·sched.runqsize > 0) { runtime·lock(&runtime·sched); gp = globrunqget(m->p, 1); runtime·unlock(&runtime·sched); } If M gets gp from global runq here, it does not reset m->spinning. R=golang-dev, rsc CC=golang-dev https://golang.org/cl/10743044 |
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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.html in your web browser.
After installing Go, you can view a nicely formatted
doc/install.html by running godoc --http=:6060
and then visiting http://localhost:6060/doc/install.html.
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.