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time: in Format give buffer an initial capacity

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I have a small web server that simply sets several cookies
along with an expires header, and then returns.  In the
cpuprofile for a 200k request benchmark, time.Time.Format()
was showing up as 8.3% of cpu usage.  Giving the buffer an
inital capacity to avoid reallocs on append drops it down to
7.6%.

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/5992058
This commit is contained in:
Bobby Powers 2012-04-07 10:51:32 +10:00 committed by Rob Pike
parent f27348776f
commit c9529e02c1
1 changed files with 1 additions and 1 deletions
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2
src/pkg/time/format.go
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@ -367,7 +367,7 @@ func (t Time) Format(layout string) string {
hour int = -1 hour int = -1
min int min int
sec int sec int
b buffer b buffer = make([]byte, 0, len(layout))
) )
// Each iteration generates one std value. // Each iteration generates one std value.
for { for {