OpenMP/Benchmarks
< OpenMP
Neighborhood analysis
Performance using OpenMP and different compilers:
source|svn/sandbox/soeren/benchmarks/neighborhood_openmp/
Best to run it 4 times for each case, discard the first and average the next 3.
Example usage:
unset OMP_NUM_THREADS
time ./neighbor 5000 5000 23
export OMP_NUM_THREADS=1
time ./neighbor 5000 5000 23
...
export OMP_NUM_THREADS=6
time ./neighbor 5000 5000 23
Test setup: 5000x5000 array with a window size of 23x23 cells
Results table
CPU | Available cores | OMP NUM THREADS | Time "real" | Time "user" | Time "sys" | Compiler | Compiler version | Compiler flags | OS | System RAM | Data sum | Data mean |
---|---|---|---|---|---|---|---|---|---|---|---|---|
AMD Phenom II X6 1090T | 6 | 1 | 129.17s | 124.94s | 0.75s | gcc | 4.4.5 | -O0 | Debian GNU/Linux 6.0.7 (squeeze) | 8.0 gb | ||
AMD Phenom II X6 1090T | 6 | 2 | 64.64s | 127.89s | 0.31s | gcc | 4.4.5 | -O0 | Debian GNU/Linux 6.0.7 (squeeze) | 8.0 gb | ||
AMD Phenom II X6 1090T | 6 | 4 | 37.26s | 145.96s | 0.52s | gcc | 4.4.5 | -O0 | Debian GNU/Linux 6.0.7 (squeeze) | 8.0 gb | ||
AMD Phenom II X6 1090T | 6 | 6 | 25.17s | 147.70s | 0.49s | gcc | 4.4.5 | -O0 | Debian GNU/Linux 6.0.7 (squeeze) | 8.0 gb |