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testing/benchmark: paranoia - make sure n always grows

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R=wcn
CC=golang-dev
https://golang.org/cl/223075
This commit is contained in:
Russ Cox 2010-02-26 17:18:43 -08:00
parent ef531c2b57
commit fe746055a2
1 changed files with 9 additions and 1 deletions
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10
src/pkg/testing/benchmark.go
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@ -78,6 +78,13 @@ func min(x, y int) int {
return x return x
} }
func max(x, y int) int {
if x < y {
return y
}
return x
}
// roundDown10 rounds a number down to the nearest power of 10. // roundDown10 rounds a number down to the nearest power of 10.
func roundDown10(n int) int { func roundDown10(n int) int {
var tens = 0 var tens = 0
@ -125,7 +132,8 @@ func (b *B) run() {
} }
// Run more iterations than we think we'll need for a second (1.5x). // Run more iterations than we think we'll need for a second (1.5x).
// Don't grow too fast in case we had timing errors previously. // Don't grow too fast in case we had timing errors previously.
n = min(int(1.5*float(n)), 100*last) // Be sure to run at least one more than last time.
n = max(min(n+n/2, 100*last), last+1)
// Round up to something easy to read. // Round up to something easy to read.
n = roundUp(n) n = roundUp(n)
b.runN(n) b.runN(n)