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| author | Martin Möhrmann <moehrmann@google.com> | 2018-10-28 17:28:04 +0100 |
|---|---|---|
| committer | Martin Möhrmann <martisch@uos.de> | 2018-11-14 20:32:15 +0000 |
| commit | f36e92dbfc343210f10b0ae9e39293fdb44b8396 (patch) | |
| tree | 84adfb65ad25d084ea177d7d9237b17249633aa6 /src/net/http | |
| parent | 75798e8ada7fcb286f633618ac2f55ad5240ed97 (diff) | |
| download | go-f36e92dbfc343210f10b0ae9e39293fdb44b8396.tar.xz | |
fmt: avoid allocation when formatting byte slice arguments with verb s
fmtBytes is in the top 10 callers of runtime.slicebytetostring according
to Google wide profiling data.
Avoid the string conversion of the input byte slice in fmtBytes by calling
a newly added specialized fmtS function for byte slices.
Expand tests for verb s with widths to test strings and byte slice arguments.
SprintfTruncateString 157ns ± 4% 156ns ± 3% ~ (p=0.122 n=20+20)
SprintfTruncateBytes 188ns ± 2% 155ns ± 3% -18.00% (p=0.000 n=20+19)
name old alloc/op new alloc/op delta
SprintfTruncateString 16.0B ± 0% 16.0B ± 0% ~ (all equal)
SprintfTruncateBytes 64.0B ± 0% 16.0B ± 0% -75.00% (p=0.000 n=20+20)
name old allocs/op new allocs/op delta
SprintfTruncateString 1.00 ± 0% 1.00 ± 0% ~ (all equal)
SprintfTruncateBytes 2.00 ± 0% 1.00 ± 0% -50.00% (p=0.000 n=20+20)
Change-Id: I461bf514d4232b39bd9c812f7faa4e5ef693a03b
Reviewed-on: https://go-review.googlesource.com/c/145284
Run-TryBot: Martin Möhrmann <martisch@uos.de>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rob Pike <r@golang.org>
Diffstat (limited to 'src/net/http')
0 files changed, 0 insertions, 0 deletions