回复:在 SSE2 CPU 上为 0.3.6 并行计算 4 个哈希
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速度差距如此之大,达到 4 倍或 6 倍,感觉很可能是旧芯片在某个特殊的薄弱环节或某条指令上很慢。除非这是 i5 宣传过的特性,说他们把 SSE2 提速了六倍。
简要汇总: Xeon Quad 慢 41% Core 2 Duo 慢 55% Core 2 Duo 相同(vess) Core 2 Quad 慢 50% Core i5 快 200%(nelisky) Core i5 快 100%(vess) AMD Opteron 快 105%
aceat64: 我的系统从约 7100 降到了约 4200。 这套特定系统配有两颗 Intel Xeon 四核 CPU(E5335),主频为 2.00GHz。
impossible7: 在一台运行 x86_64 Linux 的 Intel Core 2 Duo T7300 上,它比原版(r121)慢了 55%
nelisky: 我的 Core2Quad(Q6600)慢了 50%, 我的 i5 提升了约 200%,
impossible7: 在一台运行 x86_64 Linux 的 AMD Opteron 2374 HE 上,我得到了 105% 的提升(!)
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That big of a difference in speed, by a factor of 4 or 6, feels like it's likely to be some quirky weak spot or instruction that the old chip is slow with. Unless it's a touted feature of the i5 that they made SSE2 six times faster.
A quick summary: Xeon Quad 41% slower Core 2 Duo 55% slower Core 2 Duo same (vess) Core 2 Quad 50% slower Core i5 200% faster (nelisky) Core i5 100% faster (vess) AMD Opteron 105% faster
aceat64: My system went from ~7100 to ~4200. This particular system has dual Intel Xeon Quad-Core CPUs (E5335) @ 2.00GHz.
impossible7: on an Intel Core 2 Duo T7300 running x86_64 linux it was 55% slower compared to the stock version (r121)
nelisky: My Core2Quad (Q6600) slowed down 50%, my i5 improved ~200%,
impossible7: on an AMD Opteron 2374 HE running x86_64 linux I got a 105% improvement (!)