From: Kumaran Kalyanasundaram (kumaran@vonkarman.chicago.sgi.com)
Date: Tue Jan 22 2002 - 15:25:09 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 = 8000000
Offset = 0
The total memory requirement is 183 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 32774 microseconds
(= 32774 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: 2831.72 0.0452 0.0459 0.0456 0.0456 0.0458
Scale: 2808.76 0.0456 0.0464 0.0459 0.0459 0.0459
Add: 3145.33 0.0610 0.0614 0.0613 0.0613 0.0613
Triad: 3173.27 0.0605 0.0611 0.0608 0.0608 0.0607
-----------------------------------------------------------------------------
All times are
0.0457 0.0456 0.0614 0.0605
0.0459 0.0459 0.0612 0.0605
0.0457 0.0459 0.0614 0.0609
0.0452 0.0464 0.0610 0.0611
-----------------------------------------------------------------------------
Sum of a is = 25312.50000057252
Sum of b is = 5062.500000004038
Sum of c is = 6749.999999831861
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 - 23:31:07 CST