The resolution by using __rdtsc, __cpuid and __rdtscp to measure performance
Descriptions
- According to How to Benchmark Code Execution Times on Intel® IA-32 and IA-64 Instruction Set Architectures.
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Results
- Executes 1000000 times per loop when turned off most functionalities that affect measurement.
Loading hello module...
loop_size:0 >>>> variance(cycles): 56; max_deviation: 2320 ;min time: 44
loop_size:1 >>>> variance(cycles): 3; max_deviation: 196 ;min time: 44
loop_size:2 >>>> variance(cycles): 3; max_deviation: 52 ;min time: 44
loop_size:3 >>>> variance(cycles): 3; max_deviation: 200 ;min time: 44
loop_size:4 >>>> variance(cycles): 35; max_deviation: 1272 ;min time: 44
loop_size:5 >>>> variance(cycles): 41; max_deviation: 1436 ;min time: 44
loop_size:6 >>>> variance(cycles): 4; max_deviation: 48 ;min time: 44
loop_size:7 >>>> variance(cycles): 23705; max_deviation: 48212 ;min time: 44
loop_size:8 >>>> variance(cycles): 0; max_deviation: 64 ;min time: 48
loop_size:9 >>>> variance(cycles): 1183; max_deviation: 10424 ;min time: 48
loop_size:10 >>>> variance(cycles): 62; max_deviation: 1504 ;min time: 48
loop_size:11 >>>> variance(cycles): 532; max_deviation: 7108 ;min time: 48
.........
.........
loop_size:994 >>>> variance(cycles): 107645; max_deviation: 48216 ;min time: 2024
loop_size:995 >>>> variance(cycles): 238464; max_deviation: 109996 ;min time: 2028
loop_size:996 >>>> variance(cycles): 13831; max_deviation: 31548 ;min time: 2028
loop_size:997 >>>> variance(cycles): 26722152; max_deviation: 1633788 ;min time: 2032
loop_size:998 >>>> variance(cycles): 39271; max_deviation: 56508 ;min time: 2032
loop_size:999 >>>> variance(cycles): 2648; max_deviation: 10948 ;min time: 2036
total number of spurious min values = 0
total variance = 8741630
absolute max deviation = 111584704
variance of variances = 14133967985047
variance of minimum values = 335600
- Executes 1000000 times per loop when turned on most functionalities that affect measurement.
Loading hello module...
loop_size:0 >>>> variance(cycles): 6; max_deviation: 405 ;min time: 42
loop_size:1 >>>> variance(cycles): 4; max_deviation: 27 ;min time: 42
loop_size:2 >>>> variance(cycles): 6; max_deviation: 435 ;min time: 42
loop_size:3 >>>> variance(cycles): 4; max_deviation: 39 ;min time: 42
loop_size:4 >>>> variance(cycles): 4; max_deviation: 45 ;min time: 42
loop_size:5 >>>> variance(cycles): 4; max_deviation: 108 ;min time: 42
loop_size:6 >>>> variance(cycles): 7; max_deviation: 108 ;min time: 42
loop_size:7 >>>> variance(cycles): 11; max_deviation: 411 ;min time: 42
loop_size:8 >>>> variance(cycles): 8; max_deviation: 426 ;min time: 45
loop_size:9 >>>> variance(cycles): 112; max_deviation: 3159 ;min time: 45
loop_size:10 >>>> variance(cycles): 16; max_deviation: 489 ;min time: 45
loop_size:11 >>>> variance(cycles): 143; max_deviation: 2661 ;min time: 45
.........
.........
loop_size:994 >>>> variance(cycles): 2332; max_deviation: 2376 ;min time: 1932
loop_size:995 >>>> variance(cycles): 2278; max_deviation: 2352 ;min time: 1935
loop_size:996 >>>> variance(cycles): 2360; max_deviation: 2403 ;min time: 1935
loop_size:997 >>>> variance(cycles): 2955; max_deviation: 6282 ;min time: 1938
loop_size:998 >>>> variance(cycles): 2544; max_deviation: 2415 ;min time: 1938
loop_size:999 >>>> variance(cycles): 2474; max_deviation: 2502 ;min time: 1941
total number of spurious min values = 1
total variance = 8162
absolute max deviation = 91305
variance of variances = 510271300
variance of minimum values = 305686
Comments
- The result is almost the same as the version using inline assembler except that it is slightly faster.
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