https://github.com/certik/matmul
Matrix multiplication benchmark
https://github.com/certik/matmul
benchmark fortran matrix-multiplication
Last synced: about 1 month ago
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Matrix multiplication benchmark
- Host: GitHub
- URL: https://github.com/certik/matmul
- Owner: certik
- License: mit
- Created: 2023-05-19T03:09:18.000Z (almost 2 years ago)
- Default Branch: main
- Last Pushed: 2023-11-29T16:56:24.000Z (over 1 year ago)
- Last Synced: 2025-02-01T20:13:32.546Z (3 months ago)
- Topics: benchmark, fortran, matrix-multiplication
- Language: Fortran
- Homepage:
- Size: 20.5 KB
- Stars: 5
- Watchers: 2
- Forks: 2
- Open Issues: 6
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
# MatMul Benchmark
Run:
```
FC=gfortran cmake -DMATMUL_BLAS=OpenBLAS .
make
OMP_NUM_THREADS=1 ./matmul
```
# Benchmark results on Apple M1
The theoretical performance peak for matmul is just the cost of `fma`, which is
0.125 clock cycles per double precision matrix element (`fmla.2d v0, v0, v0`
takes 0.25 cycles), and 0.0625 per single precision element.
Single precison (f32) matmul
peak = 0.0625 clock cycles
n OpenBlas
512 0.0768
1024 0.0672
2048 0.0640
4096 0.0632
8192 0.0631
To convert these clock cycles to seconds, multiply by n^3 and divide by 3.2GHz.
For example the n=8192 case gives 10.84s:
>>> n = 8192; 0.0631*n**3 / 3.2e9
10.840497455104