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On Fri, May 18, 2012 at 03:25:50PM -0600, Eric Blake wrote: > On 12/31/1969 05:00 PM, wrote: > > >> I use only SSE2 instructions and my algorithm is faster than using SSE4 instructions. > >> With trivial modifications I could also use plain arithmetic/AVX2 > > I knew that when I first posted the twoway strstr implementation that it > was not optimal for short searches, and I totally welcome these attempts > to approve things. My biggest concern is the avoidance of quadratic > effects (strstr should always be linear speed, as proven by the twoway > algorithm, and memmem should be sublinear with large enough needles, by > skipping over portions of the haystack). > > > The biggest problem I have with reviewing *any* of this code is that > > performance is relative to benchmarks. > > > > As a community we have no baseline benchmark numbers. > > Precisely - the very reason that I have not tried to further optimize > anything in glibc beyond my twoway string, and the reason the SSE4 > quadratic pessimization even got in to glibc in the first place, is > because we don't have a good benchmark. I wrote benchmark that measures mean instructions per character+-standard deviation for random strings and matching aaaaaa with aaaab. I included strlen as lower bound on speed. Instead two-way I try universal hashing. For needle<16 bruteforce is sufficient, for larger I could improve it by computing hash qwordwise. On core2 results are following strstr_arit.c strstr_glibc.c strstr_hash.c strstr_sse2.c strstr_strlen.c random68.874670+-117.778018 random62.414109+-88.523497 random71.105749+-118.411304 random68.489939+-95.686937 random59.604025+-105.781524 34.579994+-58.177382 33.038745+-50.143408 35.578060+-69.066672 34.563682+-45.405598 29.780603+-54.778198 23.461062+-32.991196 22.971928+-28.266357 23.606689+-31.567309 23.363416+-31.987842 19.887712+-91.443525 17.402773+-21.254245 17.942685+-24.612786 17.700153+-22.835210 17.775290+-39.134757 14.768788+-21.345323 14.001901+-21.377552 14.955589+-20.697223 14.127538+-14.798144 14.338345+-18.739754 11.934428+-25.966254 12.147168+-14.669003 13.170489+-23.999207 11.783546+-16.645928 12.218846+-20.767685 9.835337+-10.920770 10.795385+-84.557790 12.195323+-15.950917 10.099348+-15.980021 10.527776+-14.860571 8.469664+-14.020109 9.367537+-15.006729 11.219251+-14.879306 8.839525+-11.421896 9.342937+-12.753878 7.412452+-11.233204 8.353610+-11.190722 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cpu family : 6 model : 23 model name : Intel(R) Core(TM)2 Duo CPU T9300 @ 2.50GHz stepping : 6 cpu MHz : 800.000 cache size : 6144 KB physical id : 0 siblings : 2 core id : 0 cpu cores : 2 apicid : 0 initial apicid : 0 fpu : yes fpu_exception : yes cpuid level : 10 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc arch_perfmon pebs bts rep_good nopl aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm sse4_1 lahf_lm ida dts tpr_shadow vnmi flexpriority bogomips : 4987.31 clflush size : 64 cache_alignment : 64 address sizes : 36 bits physical, 48 bits virtual power management: processor : 1 vendor_id : GenuineIntel cpu family : 6 model : 23 model name : Intel(R) Core(TM)2 Duo CPU T9300 @ 2.50GHz stepping : 6 cpu MHz : 2500.000 cache size : 6144 KB physical id : 0 siblings : 2 core id : 1 cpu cores : 2 apicid : 1 initial apicid : 1 fpu : yes fpu_exception : yes cpuid level : 10 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc arch_perfmon pebs bts rep_good nopl aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm sse4_1 lahf_lm ida dts tpr_shadow vnmi flexpriority bogomips : 4987.45 clflush size : 64 cache_alignment : 64 address sizes : 36 bits physical, 48 bits virtual power management:
Attachment:
benchmark.tar.bz2
Description: Binary data
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