aafd96408f
I was surprised to see readvarint show up in a cpu profile. Use a few simple optimizations to speed up stack copying: * Avoid making a copy of the cache.entries array or any of its elements. * Use a shift instead of a signed division in stackmapdata. * Change readvarint to return the number of bytes consumed rather than an updated slice. * Make some minor optimizations to readvarint to help the compiler. * Avoid called readvarint when the value fits in a single byte. The first and last optimizations are the most significant, although they all contribute a little. Add a benchmark for stack copying that includes lots of different functions in a recursive loop, to bust the cache. This might speed up other runtime operations as well; I only benchmarked stack copying. name old time/op new time/op delta StackCopy-8 96.4ms ± 2% 82.7ms ± 1% -14.24% (p=0.000 n=20+19) StackCopyNoCache-8 167ms ± 1% 131ms ± 1% -21.58% (p=0.000 n=20+20) Change-Id: I13d5c455c65073c73b656acad86cf8e8e3c9807b Reviewed-on: https://go-review.googlesource.com/43150 Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Austin Clements <austin@google.com> |
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README.md
The Go Programming Language
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