Permalink
Browse files

time: in Format give buffer an initial capacity

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
  • Loading branch information...
1 parent f273487 commit c9529e02c1454de4e88f402df666cdccec25a744 @bpowers bpowers committed with robpike Apr 7, 2012
Showing with 1 addition and 1 deletion.
  1. +1 −1 src/pkg/time/format.go
@@ -367,7 +367,7 @@ func (t Time) Format(layout string) string {
hour int = -1
min int
sec int
- b buffer
+ b buffer = make([]byte, 0, len(layout))
)
// Each iteration generates one std value.
for {

0 comments on commit c9529e0

Please sign in to comment.