gistfile1.txt

heller@g2:~/programming/hpx/build/debug$ gcc -DSTREAM_ARRAY_SIZE=10000000 -O3 -fopenmp stream.c && perf stat -e cache-misses,cache-references ./a.out 
-------------------------------------------------------------
STREAM version $Revision: 5.10 $
-------------------------------------------------------------
This system uses 8 bytes per array element.
-------------------------------------------------------------
Array size = 10000000 (elements), Offset = 0 (elements)
Memory per array = 76.3 MiB (= 0.1 GiB).
Total memory required = 228.9 MiB (= 0.2 GiB).
Each kernel will be executed 10 times.
 The *best* time for each kernel (excluding the first iteration)
 will be used to compute the reported bandwidth.
-------------------------------------------------------------
Number of Threads requested = 48
Number of Threads counted = 48
-------------------------------------------------------------
Your clock granularity/precision appears to be 1 microseconds.
Each test below will take on the order of 818 microseconds.
   (= 818 clock ticks)
Increase the size of the arrays if this shows that
you are not getting at least 20 clock ticks per test.
-------------------------------------------------------------
WARNING -- The above is only a rough guideline.
For best results, please be sure you know the
precision of your system timer.
-------------------------------------------------------------
Function    Best Rate MB/s  Avg time     Min time     Max time
Copy:          156103.4     0.001033     0.001025     0.001056
Scale:         138055.7     0.001178     0.001159     0.001243
Add:           155440.5     0.001555     0.001544     0.001582
Triad:         155129.1     0.001571     0.001547     0.001590
-------------------------------------------------------------
Solution Validates: avg error less than 1.000000e-13 on all three arrays
-------------------------------------------------------------

 Performance counter stats for './a.out':

       108,483,660      cache-misses              #   85.497 % of all cache refs    
       126,885,550      cache-references                                            

       0.137512927 seconds time elapsed

heller@g2:~/programming/hpx/build/debug$ gcc -DSTREAM_ARRAY_SIZE=5000000 -O3 -fopenmp stream.c && perf stat -e cache-misses,cache-references ./a.out
-------------------------------------------------------------
STREAM version $Revision: 5.10 $
-------------------------------------------------------------
This system uses 8 bytes per array element.
-------------------------------------------------------------
Array size = 5000000 (elements), Offset = 0 (elements)
Memory per array = 38.1 MiB (= 0.0 GiB).
Total memory required = 114.4 MiB (= 0.1 GiB).
Each kernel will be executed 10 times.
 The *best* time for each kernel (excluding the first iteration)
 will be used to compute the reported bandwidth.
-------------------------------------------------------------
Number of Threads requested = 48
Number of Threads counted = 48
-------------------------------------------------------------
Your clock granularity/precision appears to be 1 microseconds.
Each test below will take on the order of 381 microseconds.
   (= 381 clock ticks)
Increase the size of the arrays if this shows that
you are not getting at least 20 clock ticks per test.
-------------------------------------------------------------
WARNING -- The above is only a rough guideline.
For best results, please be sure you know the
precision of your system timer.
-------------------------------------------------------------
Function    Best Rate MB/s  Avg time     Min time     Max time
Copy:          183859.9     0.000450     0.000435     0.000472
Scale:         153007.0     0.000550     0.000523     0.000618
Add:           172901.6     0.000712     0.000694     0.000747
Triad:         182625.7     0.000673     0.000657     0.000692
-------------------------------------------------------------
Solution Validates: avg error less than 1.000000e-13 on all three arrays
-------------------------------------------------------------

 Performance counter stats for './a.out':

        44,022,735      cache-misses              #   69.735 % of all cache refs    
        63,128,670      cache-references                                            

       0.072526769 seconds time elapsed

heller@g2:~/programming/hpx/build/debug$ gcc -DSTREAM_ARRAY_SIZE=2000000 -O3 -fopenmp stream.c && perf stat -e cache-misses,cache-references ./a.out
-------------------------------------------------------------
STREAM version $Revision: 5.10 $
-------------------------------------------------------------
This system uses 8 bytes per array element.
-------------------------------------------------------------
Array size = 2000000 (elements), Offset = 0 (elements)
Memory per array = 15.3 MiB (= 0.0 GiB).
Total memory required = 45.8 MiB (= 0.0 GiB).
Each kernel will be executed 10 times.
 The *best* time for each kernel (excluding the first iteration)
 will be used to compute the reported bandwidth.
-------------------------------------------------------------
Number of Threads requested = 48
Number of Threads counted = 48
-------------------------------------------------------------
Your clock granularity/precision appears to be 1 microseconds.
Each test below will take on the order of 103 microseconds.
   (= 103 clock ticks)
Increase the size of the arrays if this shows that
you are not getting at least 20 clock ticks per test.
-------------------------------------------------------------
WARNING -- The above is only a rough guideline.
For best results, please be sure you know the
precision of your system timer.
-------------------------------------------------------------
Function    Best Rate MB/s  Avg time     Min time     Max time
Copy:          367719.8     0.000105     0.000087     0.000117
Scale:         293693.1     0.000126     0.000109     0.000136
Add:           300039.6     0.000185     0.000160     0.000237
Triad:         287199.1     0.000188     0.000167     0.000201
-------------------------------------------------------------
Solution Validates: avg error less than 1.000000e-13 on all three arrays
-------------------------------------------------------------

 Performance counter stats for './a.out':

         1,873,756      cache-misses              #    8.191 % of all cache refs    
        22,875,897      cache-references                                            

       0.032436497 seconds time elapsed

heller@g2:~/programming/hpx/build/debug$