From: Kumaran Kalyanasundaram (kumaran@vonkarman.chicago.sgi.com)
Date: Tue Jan 22 2002 - 15:25:26 CST
SGI Origin 300
R14000 500mhz
2mb L2 cache
----------------------------------------------
Double precision appears to have 16 digits of accuracy
Assuming 8 bytes per DOUBLE PRECISION word
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Array size = 16000000
Offset = 0
The total memory requirement is 366 MB
You are running each test 4 times
The *best* time for each test is used
----------------------------------------------------
Your clock granularity/precision appears to be 1 microseconds
The tests below will each take a time on the order
of 38945 microseconds
(= 38945 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 Rate (MB/s) Min time Max time Mean time RMS time Median
Copy: 5512.33 0.0464 0.0471 0.0469 0.0469 0.0467
Scale: 5505.92 0.0465 0.0469 0.0467 0.0467 0.0467
Add: 6178.18 0.0622 0.0628 0.0626 0.0626 0.0627
Triad: 6417.15 0.0598 0.0607 0.0602 0.0602 0.0599
-----------------------------------------------------------------------------
All times are
0.0470 0.0467 0.0622 0.0607
0.0464 0.0469 0.0627 0.0598
0.0470 0.0465 0.0628 0.0599
0.0471 0.0465 0.0628 0.0604
-----------------------------------------------------------------------------
Sum of a is = 25312.50000057253
Sum of b is = 5062.500000004040
Sum of c is = 6749.999999831864
Kumaran Kalyanasundaram, PhD Performance Engineering
SGI 2060 E. Algonquin Rd, Schaumburg, IL 60504 kumaran@sgi.com
Ph. (847) 925 2913 Fax (847) 925 2930
This archive was generated by hypermail 2.1.4 : Sun Feb 10 2002 - 23:31:12 CST