OMPeak

An OpenMP benchmarking utility

The purpose of this benchmark is to test peak performance of OpenMP code using very simple tests.

Usage:

This program has one argument which takes the number of threads, if it is not specified the program will run single threaded.

./ompeak #threads (-s) (-ncl)

-s: run a single test with the number of threads specified
-ncl: do not force the code to use an entire cache line

Output:

The program outputs information in the following way: A table is generated with each column showing the size of memory transferred (MBytes) and the rows showing the number of openMP threads.

Three tests are performed, for each test the performance, optimal thread number and memory transfer size are shown

./ompeak 4
Memory transfered in MBytes (column) for a certain number of threads (rows): 
     0.25    0.50    1.00    2.00    4.00    8.00    16.00   32.00   64.00   128.00  256.00  512.00 
Performing ReadWrite Test: 
  1  8.416   10.539  5.838   12.006  12.587  10.921  12.874  12.218  8.814   8.822   10.706  4.236  
  2  4.279   4.804   12.840  14.832  15.624  16.343  8.361   8.947   11.327  16.779  14.974  4.916  
  3  8.236   13.684  14.805  16.787  15.584  18.084  17.716  11.655  13.499  16.926  17.505  5.832  
  4  5.428   10.685  7.529   15.663  16.600  16.696  16.783  16.549  17.645  17.518  16.486  5.964  
Best: 3 threads,    18.084 GB/s,    8.000 MB 
Performing Read Test: 
  1  5.523   7.302   8.044   8.015   8.508   9.695   10.173  10.655  10.910  10.652  9.995   10.706 
  2  3.163   5.637   6.919   8.434   9.628   10.249  11.792  13.366  13.541  14.488  14.791  14.731 
  3  3.014   4.846   8.500   9.143   11.188  11.644  12.972  15.443  15.643  16.292  16.836  16.671 
  4  2.981   4.250   5.929   7.575   10.976  12.064  12.739  15.443  15.007  16.938  15.817  15.565 
Best: 4 threads,    16.938 GB/s,    128.000 MB 
Performing Write Test: 
  1  9.062   9.752   9.660   9.918   9.621   9.389   8.681   8.625   8.579   8.444   8.305   8.395  
  2  3.807   3.821   7.237   8.308   10.389  9.939   10.022  9.301   9.215   9.088   9.097   9.182  
  3  3.170   6.187   8.275   10.436  10.015  10.214  9.680   9.226   9.097   9.256   8.964   8.756  
  4  2.775   4.697   4.068   9.438   9.966   9.990   9.063   9.076   8.893   8.771   8.809   8.076  
Best: 3 threads,    10.436 GB/s,    2.000 MB