aw/go-resize
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Limit spawned goroutines to GOMAXPROCS(0).

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This change sets the number of spawned goroutines to the GOMAXPROCS
value set by the user.

Using more goroutines than available execution threads is slightly
detrimental to performance (~0.5%), and prevents users of the library
from controlling the number of spawned goroutines.
This commit is contained in:
Charlie Vieth 2015-03-15 17:59:38 -04:00
parent d8255b0421
commit 076a9ce3b9
1 changed files with 2 additions and 2 deletions
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4
resize.go
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@ -97,7 +97,7 @@ func Resize(width, height uint, img image.Image, interp InterpolationFunction) i
} }
taps, kernel := interp.kernel() taps, kernel := interp.kernel()
cpus := runtime.NumCPU() cpus := runtime.GOMAXPROCS(0)
wg := sync.WaitGroup{} wg := sync.WaitGroup{}
// Generic access to image.Image is slow in tight loops. // Generic access to image.Image is slow in tight loops.
@ -283,7 +283,7 @@ func Resize(width, height uint, img image.Image, interp InterpolationFunction) i
func resizeNearest(width, height uint, scaleX, scaleY float64, img image.Image, interp InterpolationFunction) image.Image { func resizeNearest(width, height uint, scaleX, scaleY float64, img image.Image, interp InterpolationFunction) image.Image {
taps, _ := interp.kernel() taps, _ := interp.kernel()
cpus := runtime.NumCPU() cpus := runtime.GOMAXPROCS(0)
wg := sync.WaitGroup{} wg := sync.WaitGroup{}
switch input := img.(type) { switch input := img.(type) {