Position population-count benchmarks
requirements
- Linux, with bare-metal access (you may need root)
- Make sure your processor is in performance mode (not powersaving)
- x64 processor supporting the AVX512BW extension
instructions
make
./instrumented_benchmark -v
Sample output
On a Cannon Lake processor:
$ ./instrumented_benchmark -v
n = 10000000 m = 1
iterations = 100
array size: 19.073 MB
nothing instructions per cycle 0.20, cycles per 16-bit word: 0.000, instructions per 16-bit word 0.000
min: 65 cycles, 13 instructions, 1 branch mis., 0 cache ref., 0 cache mis.
avg: 69.4 cycles, 13.0 instructions, 1.0 branch mis., 0.1 cache ref., 0.1 cache mis.
pospopcnt_u16_scalar alignments: 16
instructions per cycle 3.75, cycles per 16-bit word: 17.325, instructions per 16-bit word 65.000
min: 173251245 cycles, 650000159 instructions, 3 branch mis., 407959 cache ref., 283659 cache mis.
avg: 173473725.4 cycles, 650000160.2 instructions, 8.4 branch mis., 409996.0 cache ref., 295584.1 cache mis.
0.367 GB/s
estimated clock in range 3.102 GHz to 3.183 GHz
pospopcnt_u16_avx512bw_harvey_seal_1KB alignments: 16
instructions per cycle 0.46, cycles per 16-bit word: 0.497, instructions per 16-bit word 0.227
min: 4966068 cycles, 2271648 instructions, 114 branch mis., 547590 cache ref., 262188 cache mis.
avg: 5296987.3 cycles, 2271648.7 instructions, 137.9 branch mis., 552796.2 cache ref., 275536.8 cache mis.
12.407 GB/s
estimated clock in range 2.916 GHz to 3.140 GHz
pospopcnt_u16_avx512bw_harvey_seal_512B alignments: 16
instructions per cycle 0.60, cycles per 16-bit word: 0.538, instructions per 16-bit word 0.325
min: 5382323 cycles, 3245605 instructions, 82 branch mis., 487390 cache ref., 268386 cache mis.
avg: 5697539.5 cycles, 3245605.8 instructions, 125.8 branch mis., 498338.1 cache ref., 279114.2 cache mis.
11.658 GB/s
estimated clock in range 2.985 GHz to 3.142 GHz
pospopcnt_u16_avx512bw_harvey_seal_256B alignments: 16
instructions per cycle 0.84, cycles per 16-bit word: 0.618, instructions per 16-bit word 0.518
min: 6184692 cycles, 5181931 instructions, 114 branch mis., 441161 cache ref., 267157 cache mis.
avg: 6661233.2 cycles, 5181931.2 instructions, 124.0 branch mis., 446684.9 cache ref., 280685.8 cache mis.
10.162 GB/s
estimated clock in range 2.956 GHz to 3.148 GHz