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Michael Hudson-Doyle authored
Issue #12552 can happen on ppc64 too, although much less frequently in my testing. I'm fairly sure this fixes it (2 out of 200 runs of oracle.test failed without this change and 0 of 200 failed with it). It's also a lot faster for large moves/clears: name old speed new speed delta Memmove1-6 157MB/s ± 9% 144MB/s ± 0% -8.20% (p=0.004 n=10+9) Memmove2-6 281MB/s ± 1% 249MB/s ± 1% -11.53% (p=0.000 n=10+10) Memmove3-6 376MB/s ± 1% 328MB/s ± 1% -12.64% (p=0.000 n=10+10) Memmove4-6 475MB/s ± 4% 345MB/s ± 1% -27.28% (p=0.000 n=10+8) Memmove5-6 540MB/s ± 1% 393MB/s ± 0% -27.21% (p=0.000 n=10+10) Memmove6-6 609MB/s ± 0% 423MB/s ± 0% -30.56% (p=0.000 n=9+10) Memmove7-6 659MB/s ± 0% 468MB/s ± 0% -28.99% (p=0.000 n=8+10) Memmove8-6 705MB/s ± 0% 1295MB/s ± 1% +83.73% (p=0.000 n=9+9) Memmove9-6 740MB/s ± 1% 1241MB/s ± 1% +67.61% (p=0.000 n=10+8) Memmove10-6 780MB/s ± 0% 1162MB/s ± 1% +48.95% (p=0.000 n=10+9) Memmove11-6 811MB/s ± 0% 1180MB/s ± 0% +45.58% (p=0.000 n=8+9) Memmove12-6 820MB/s ± 1% 1073MB/s ± 1% +30.83% (p=0.000 n=10+9) Memmove13-6 849MB/s ± 0% 1068MB/s ± 1% +25.87% (p=0.000 n=10+10) Memmove14-6 877MB/s ± 0% 911MB/s ± 0% +3.83% (p=0.000 n=10+10) Memmove15-6 893MB/s ± 0% 922MB/s ± 0% +3.25% (p=0.000 n=10+9) Memmove16-6 897MB/s ± 1% 2418MB/s ± 1% +169.67% (p=0.000 n=10+9) Memmove32-6 908MB/s ± 0% 3927MB/s ± 2% +332.64% (p=0.000 n=10+8) Memmove64-6 1.11GB/s ± 0% 5.59GB/s ± 0% +404.64% (p=0.000 n=9+9) Memmove128-6 1.25GB/s ± 0% 6.71GB/s ± 2% +437.49% (p=0.000 n=9+10) Memmove256-6 1.33GB/s ± 0% 7.25GB/s ± 1% +445.06% (p=0.000 n=10+10) Memmove512-6 1.38GB/s ± 0% 8.87GB/s ± 0% +544.43% (p=0.000 n=10+10) Memmove1024-6 1.40GB/s ± 0% 10.00GB/s ± 0% +613.80% (p=0.000 n=10+10) Memmove2048-6 1.41GB/s ± 0% 10.65GB/s ± 0% +652.95% (p=0.000 n=9+10) Memmove4096-6 1.42GB/s ± 0% 11.01GB/s ± 0% +675.37% (p=0.000 n=8+10) Memclr5-6 269MB/s ± 1% 264MB/s ± 0% -1.80% (p=0.000 n=10+10) Memclr16-6 600MB/s ± 0% 887MB/s ± 1% +47.83% (p=0.000 n=10+10) Memclr64-6 1.06GB/s ± 0% 2.91GB/s ± 1% +174.58% (p=0.000 n=8+10) Memclr256-6 1.32GB/s ± 0% 6.58GB/s ± 0% +399.86% (p=0.000 n=9+10) Memclr4096-6 1.42GB/s ± 0% 10.90GB/s ± 0% +668.03% (p=0.000 n=8+10) Memclr65536-6 1.43GB/s ± 0% 11.37GB/s ± 0% +697.83% (p=0.000 n=9+8) GoMemclr5-6 359MB/s ± 0% 360MB/s ± 0% +0.46% (p=0.000 n=10+10) GoMemclr16-6 750MB/s ± 0% 1264MB/s ± 1% +68.45% (p=0.000 n=10+10) GoMemclr64-6 1.17GB/s ± 0% 3.78GB/s ± 1% +223.58% (p=0.000 n=10+9) GoMemclr256-6 1.35GB/s ± 0% 7.47GB/s ± 0% +452.44% (p=0.000 n=10+10) Update #12552 Change-Id: I7192e9deb9684a843aed37f58a16a4e29970e893 Reviewed-on: https://go-review.googlesource.com/14840Reviewed-by:
Minux Ma <minux@golang.org>
2c911143
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