Okay the above tests are invalid. My function pointers weren't bound to the correct functions so there were different workloads. I'm glad this was the case because I wouldn't have a good explanation for the significant difference in performance.
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Sep 15 2024
Sep 15 2024
0xseantasker added a comment to P19 Sean::function.
These tests were run because I use std function a fair bit and was curious about the performance overhead. I've usually assumed it did some compile time switching around which would have resulted in a near 1:1 with a regular call, but quite obviously that isn't what is happening. This might be because of bind getting in the way and causing some remapping overheads. But for functions that are 1:1 mapped I would expect the implementation to result in a solution that was near to what I have done.
0xseantasker added a comment to P19 Sean::function.
| ns/op | op/s | err% | total | benchmark |--------------------:|--------------------:|--------:|----------:|:---------- | 9.03 | 110,738,754.20 | 3.0% | 2.54 | `base->Call()` | 5.28 | 189,366,926.98 | 3.7% | 1.50 | `a->Call()` | 4.83 | 207,105,530.39 | 2.4% | 1.36 | `b->Call()` | 11.85 | 84,358,606.01 | 2.2% | 3.33 | `function &Base::Call, base` | 9.00 | 111,051,549.44 | 2.7% | 2.53 | `function &A::Call, a` | 9.00 | 111,074,910.28 | 2.3% | 2.53 | `function &B::Call, b` | 11.37 | 87,932,375.07 | 2.4% | 3.19 | `boost function &Base::Call, base` | 7.31 | 136,868,309.00 | 2.3% | 2.05 | `boost function &A::Call, a` | 7.33 | 136,417,043.66 | 2.9% | 2.08 | `boost function &B::Call, b` | 10.21 | 97,977,654.63 | 2.3% | 2.85 | `function pointer direct base, &Base::Call ` | 6.63 | 150,734,756.40 | 2.6% | 1.87 | `function pointer direct a, &A::Call` | 6.88 | 145,364,737.50 | 3.1% | 1.93 | `function pointer direct b, &B::Call` | 6.19 | 161,458,499.84 | 3.0% | 1.73 | `Sean::function a|b, &A|B::Call` | 2.89 | 346,152,377.07 | 2.7% | 1.09 | `Sean::function a, &A::Call` | 2.93 | 341,304,113.06 | 2.7% | 1.10 | `Sean::function b, &B::Call` | 6.00 | 166,796,329.13 | 3.0% | 1.69 | `Sean::function direct a|b, &A|B::Call` | 2.90 | 344,292,303.07 | 2.6% | 1.07 | `Sean::function direct a, &A::Call` | 2.90 | 345,391,845.52 | 2.3% | 1.09 | `Sean::function direct b, &B::Call` | 7.22 | 138,497,211.74 | 1.8% | 2.00 | `Sean::function a|b, &A|B::CallParams` | 2.90 | 344,818,582.23 | 2.6% | 1.09 | `Sean::function a, &A::CallParams` | 3.02 | 331,334,448.80 | 2.5% | 1.12 | `Sean::function b, &B::CallParams` | 7.34 | 136,228,235.17 | 2.0% | 2.04 | `Sean::function direct a|b, &A|B::CallParams` | 3.05 | 327,705,146.85 | 3.0% | 1.11 | `Sean::function direct a, &A::CallParams` | 3.00 | 332,837,039.23 | 2.0% | 1.10 | `Sean::function direct b, &B::CallParams` | 7.38 | 135,533,804.72 | 1.9% | 2.06 | `template sean::function a|b, &A|B::CallParams` | 3.03 | 330,020,313.85 | 1.8% | 1.11 | `template sean::function a, &A::CallParams` | 2.97 | 336,151,301.10 | 2.6% | 1.12 | `template sean::function b, &B::CallParams` | 7.62 | 131,292,731.68 | 2.6% | 2.11 | `template check sean::function a|b, &A|B::CallParams` | 3.09 | 323,415,838.11 | 3.0% | 1.09 | `template check sean::function a, &A::CallParams` | 3.11 | 321,256,824.05 | 3.3% | 1.13 | `template check sean::function b, &B::CallParams`
0xseantasker added a comment to P19 Sean::function.
| ns/op | op/s | err% | total | benchmark |--------------------:|--------------------:|--------:|----------:|:---------- | 10.60 | 94,344,931.82 | 2.8% | 2.97 | `base->Call()` | 5.97 | 167,477,592.03 | 3.4% | 1.68 | `a->Call()` | 5.41 | 184,901,294.35 | 3.0% | 1.53 | `b->Call()` | 13.68 | 73,124,846.95 | 2.7% | 3.82 | `function &Base::Call, base` | 9.46 | 105,669,404.37 | 3.2% | 2.64 | `function &A::Call, a` | 9.70 | 103,085,126.35 | 3.1% | 2.67 | `function &B::Call, b` | 14.48 | 69,048,782.30 | 3.1% | 4.05 | `boost function &Base::Call, base` | 8.19 | 122,141,120.01 | 3.2% | 2.33 | `boost function &A::Call, a` | 8.29 | 120,667,180.75 | 3.7% | 2.35 | `boost function &B::Call, b` | 11.60 | 86,224,941.90 | 3.6% | 3.26 | `function pointer direct base, &Base::Call ` | 6.92 | 144,414,111.03 | 2.6% | 1.94 | `function pointer direct a, &A::Call` | 6.68 | 149,690,679.93 | 2.2% | 1.84 | `function pointer direct b, &B::Call` | 8.03 | 124,592,437.34 | 2.5% | 2.24 | `Sean::function a|b, &A|B::Call` | 5.30 | 188,772,307.34 | 3.1% | 1.48 | `Sean::function a, &A::Call` | 5.27 | 189,694,989.33 | 4.4% | 1.47 | `Sean::function b, &B::Call` | 7.28 | 137,307,480.61 | 3.4% | 2.03 | `Sean::function direct a|b, &A|B::Call` | 5.10 | 195,962,106.63 | 3.2% | 1.43 | `Sean::function direct a, &A::Call` | 5.19 | 192,672,407.85 | 3.1% | 1.45 | `Sean::function direct b, &B::Call` | 7.34 | 136,232,012.08 | 3.0% | 2.04 | `Sean::function a|b, &A|B::CallParams` | 5.21 | 191,782,099.69 | 2.7% | 1.45 | `Sean::function a, &A::CallParams` | 5.27 | 189,619,729.88 | 2.7% | 1.48 | `Sean::function b, &B::CallParams` | 7.33 | 136,398,281.55 | 3.9% | 2.05 | `Sean::function direct a|b, &A|B::CallParams` | 5.21 | 192,095,062.80 | 2.7% | 1.45 | `Sean::function direct a, &A::CallParams` | 5.32 | 188,061,229.03 | 2.6% | 1.47 | `Sean::function direct b, &B::CallParams` | 7.77 | 128,682,149.45 | 2.6% | 2.17 | `template sean::function a|b, &A|B::CallParams` | 5.21 | 191,782,392.03 | 2.7% | 1.47 | `template sean::function a, &A::CallParams` | 5.33 | 187,496,921.86 | 3.6% | 1.51 | `template sean::function b, &B::CallParams` | 8.90 | 112,357,224.57 | 2.7% | 2.50 | `template check sean::function a|b, &A|B::CallParams` | 6.01 | 166,347,689.09 | 2.8% | 1.69 | `template check sean::function a, &A::CallParams` | 5.80 | 172,298,426.51 | 3.3% | 1.64 | `template check sean::function b, &B::CallParams`
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