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rm -f *.exe *.o
gcc -O3 -c -o mysecond.o mysecond.c
gcc -O3 -c mysecond.c
gfortran -O3 -DSTREAM_ARRAY_SIZE=80000000 -DNTIMES=20 -c stream.f
gfortran -O3 stream.o mysecond.o -o stream_f.exe
gcc -O3 -DSTREAM_ARRAY_SIZE=80000000 -DNTIMES=20 stream.c -o stream_c.exe
gcc -O3 -DUNIX flops.c -o flops.exe
./stream_c.exe
-------------------------------------------------------------
STREAM version $Revision: 5.10 $
-------------------------------------------------------------
This system uses 8 bytes per array element.
-------------------------------------------------------------
Array size = 80000000 (elements), Offset = 0 (elements)
Memory per array = 610.4 MiB (= 0.6 GiB).
Total memory required = 1831.1 MiB (= 1.8 GiB).
Each kernel will be executed 20 times.
The *best* time for each kernel (excluding the first iteration)
will be used to compute the reported bandwidth.
-------------------------------------------------------------
Your clock granularity/precision appears to be 1 microseconds.
Each test below will take on the order of 46252 microseconds.
(= 46252 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: 28478.6 0.047858 0.044946 0.054333
Scale: 20551.4 0.066044 0.062283 0.077807
Add: 22534.2 0.089671 0.085204 0.099586
Triad: 22709.5 0.088864 0.084546 0.098536
-------------------------------------------------------------
Solution Validates: avg error less than 1.000000e-13 on all three arrays
-------------------------------------------------------------
./flops.exe
FLOPS C Program (Double Precision), V2.0 18 Dec 1992
Module Error RunTime MFLOPS
(usec)
1 4.0146e-13 0.0021 6622.7552
2 -1.4166e-13 0.0006 12723.3419
3 4.7184e-14 0.0027 6253.2599
4 -1.2557e-13 0.0026 5758.6323
5 -1.3800e-13 0.0051 5740.4851
6 3.2380e-13 0.0051 5674.2511
7 -8.4583e-11 0.0031 3827.0478
8 3.4867e-13 0.0053 5610.0203
Iterations = 512000000
NullTime (usec) = 0.0000
MFLOPS(1) = 9507.3864
MFLOPS(2) = 5042.7572
MFLOPS(3) = 5597.4972
MFLOPS(4) = 5766.1547