| commit | 2db58f8f2daea1c6f6134584f7811bb229177b28 | [log] [tgz] |
|---|---|---|
| author | Justin Nuß <nuss.justin@gmail.com> | Mon Apr 13 20:13:14 2015 +0200 |
| committer | Brad Fitzpatrick <bradfitz@golang.org> | Sun Apr 26 16:28:51 2015 +0000 |
| tree | c51049b2c0e3d213d961e8e7c9724bdc32df9012 | |
| parent | a5b693b431d0612b97a8978fdfa7d12310d95b6f [diff] |
encoding/csv: Preallocate records slice Currently parseRecord will always start with a nil slice and then resize the slice on append. For input with a fixed number of fields per record we can preallocate the slice to avoid having to resize the slice. This change implements this optimization by using FieldsPerRecord as capacity if it's > 0 and also adds a benchmark to better show the differences. benchmark old ns/op new ns/op delta BenchmarkRead 19741 17909 -9.28% benchmark old allocs new allocs delta BenchmarkRead 59 41 -30.51% benchmark old bytes new bytes delta BenchmarkRead 6276 5844 -6.88% Change-Id: I7c2abc9c80a23571369bcfcc99a8ffc474eae7ab Reviewed-on: https://go-review.googlesource.com/8880 Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
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