bytes, runtime: improve performance of IndexByte on ppc64x #19030
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CL https://golang.org/cl/37670 mentions this issue. |
ceseo
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May 11, 2017
This change adds a better implementation of IndexByte for ppc64x. Improvement for bytes·IndexByte: benchmark old ns/op new ns/op delta BenchmarkIndexByte/10-16 12.5 8.48 -32.16% BenchmarkIndexByte/32-16 34.4 9.85 -71.37% BenchmarkIndexByte/4K-16 3089 217 -92.98% BenchmarkIndexByte/4M-16 3154810 207051 -93.44% BenchmarkIndexByte/64M-16 50564811 5579093 -88.97% benchmark old MB/s new MB/s speedup BenchmarkIndexByte/10-16 800.41 1179.64 1.47x BenchmarkIndexByte/32-16 930.60 3249.10 3.49x BenchmarkIndexByte/4K-16 1325.71 18832.53 14.21x BenchmarkIndexByte/4M-16 1329.49 20257.29 15.24x BenchmarkIndexByte/64M-16 1327.19 12028.63 9.06x Improvement for strings·IndexByte: benchmark old ns/op new ns/op delta BenchmarkIndexByte-16 25.9 7.69 -70.31% Fixes golang#19030 Change-Id: Ifb82bbb3d643ec44b98eaa2d08a07f47e5c2fd11 Reviewed-on: https://go-review.googlesource.com/37670 Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>
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Please answer these questions before submitting your issue. Thanks!
What version of Go are you using (
go version)?go tip
What operating system and processor architecture are you using (
go env)?Ubuntu 16.04 ppc64le and RH7 ppc64
What did you do?
Looking at performance of IndexByte and found that the byte at a time compare it was doing performed very poorly on ppc64x. We have an asm implementation that improves performance by 10X or more depending on the size.
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