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peterhellberg/max_parallelism.go

Created June 24, 2013 07:25
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Find out the max value for GOMAXPROCS on your machine.
Raw
max_parallelism.go
package main
import (
"fmt"
"runtime"
)
func MaxParallelism() int {
maxProcs := runtime.GOMAXPROCS(0)
numCPU := runtime.NumCPU()
if maxProcs < numCPU {
return maxProcs
}
return numCPU
}
func main() {
fmt.Println("MaxParallelism: ", MaxParallelism())
}
@peterhellberg
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The result on my MacBook Air:

$ GOMAXPROCS=10 go run max_parallelism.go
MaxParallelism:  4

On the Raspberry Pi (Cross-compiled using GOARCH=arm GOARM=5 GOOS=linux go build max_parallelism.go)

$ GOMAXPROCS=10 ./max_parallelism
MaxParallelism:  1

@peruviangopher
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peruviangopher commented Oct 19, 2022 •
edited

Thanks, in MacBook Air M2 this is the result:

image

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