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effective_go: provide reference to runtime.NumCPU()

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R=golang-dev, robert.hencke, r
CC=golang-dev
https://golang.org/cl/5538050
This commit is contained in:
Dmitriy Vyukov 2012-01-12 22:06:50 +04:00
parent cd54e44b50
commit a03c519a8c
4 changed files with 8 additions and 3 deletions
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4
doc/effective_go.html
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@ -2623,8 +2623,10 @@ is if you want CPU parallelism you must tell the run-time
how many goroutines you want executing code simultaneously. There
are two related ways to do this. Either run your job with environment
variable <code>GOMAXPROCS</code> set to the number of cores to use
(default 1); or import the <code>runtime</code> package and call
or import the <code>runtime</code> package and call
<code>runtime.GOMAXPROCS(NCPU)</code>.
A helpful value might be <code>runtime.NumCPU()</code>, which reports the number
of logical CPUs on the local machine.
Again, this requirement is expected to be retired as the scheduling and run-time improve.
</p>

4
doc/effective_go.tmpl
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@ -2560,8 +2560,10 @@ is if you want CPU parallelism you must tell the run-time
how many goroutines you want executing code simultaneously. There
are two related ways to do this. Either run your job with environment
variable <code>GOMAXPROCS</code> set to the number of cores to use
(default 1); or import the <code>runtime</code> package and call
or import the <code>runtime</code> package and call
<code>runtime.GOMAXPROCS(NCPU)</code>.
A helpful value might be <code>runtime.NumCPU()</code>, which reports the number
of logical CPUs on the local machine.
Again, this requirement is expected to be retired as the scheduling and run-time improve.
</p>

1
src/pkg/runtime/debug.go
View File

@ -19,6 +19,7 @@ func UnlockOSThread()
// GOMAXPROCS sets the maximum number of CPUs that can be executing
// simultaneously and returns the previous setting. If n < 1, it does not
// change the current setting.
// The number of logical CPUs on the local machine can be queried with NumCPU.
// This call will go away when the scheduler improves.
func GOMAXPROCS(n int) int

2
src/pkg/runtime/extern.go
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@ -68,7 +68,7 @@ func funcline_go(*Func, uintptr) (string, int)
// mid returns the current os thread (m) id.
func mid() uint32
// NumCPU returns the number of CPUs on the local machine.
// NumCPU returns the number of logical CPUs on the local machine.
func NumCPU() int
// Semacquire waits until *s > 0 and then atomically decrements it.