From: Kumaran Kalyanasundaram (kumaran@vonkarman.chicago.sgi.com)
Date: Tue Jan 22 2002 - 15:25:40 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 = 32000000
Offset = 0
The total memory requirement is 732 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 46806 microseconds
(= 46806 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: 10773.16 0.0475 0.0610 0.0541 0.0544 0.0540
Scale: 10504.31 0.0487 0.0587 0.0539 0.0540 0.0533
Add: 12322.08 0.0623 0.0778 0.0691 0.0693 0.0681
Triad: 11834.06 0.0649 0.0781 0.0687 0.0689 0.0659
-----------------------------------------------------------------------------
All times are
0.0610 0.0587 0.0778 0.0781
0.0583 0.0578 0.0703 0.0662
0.0498 0.0487 0.0659 0.0657
0.0475 0.0501 0.0623 0.0649
-----------------------------------------------------------------------------
Sum of a is = 25312.50000057253
Sum of b is = 5062.500000004043
Sum of c is = 6749.999999831865
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 - 23:31:22 CST