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This system uses 8 bytes per DOUBLE PRECISION word.
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Array size = 2000000, Offset = 0
Total memory required = 45.8 MB.
Each test is run 50 times, but only
the *best* time for each is used.
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Your clock granularity/precision appears to be 1 microseconds.
Each test below will take on the order of 2612 microseconds.
   (= 2612 clock ticks)
Increase the size of the arrays if this shows that
you are not getting at least 20 clock ticks per test.
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Function      Rate (MB/s)   RMS time     Min time     Max time
Copy:       10078.6760       0.0033       0.0032       0.0037
Scale:       9840.0094       0.0034       0.0033       0.0040
Add:        10825.7564       0.0047       0.0044       0.0053
Triad:      10951.1854       0.0046       0.0044       0.0055