SGI Origin 3800
32 CPUs
400 MHz MIPS R12K
8 MB cache
96 GB Main Memory
IRIX 6.5.9
Results:
----------------------------------------------
Double precision appears to have 16 digits of accuracy
Assuming 8 bytes per DOUBLE PRECISION word
----------------------------------------------
Array size = 160000000
Offset = 0
The total memory requirement is 3662 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 163127 microseconds
(= 163127 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: 11026.90 0.2322 0.2327 0.2325 0.2325 0.2326
Scale: 10916.66 0.2345 0.2363 0.2358 0.2358 0.2363
Add: 12813.31 0.2997 0.2997 0.2997 0.2997 0.2997
Triad: 12538.73 0.3063 0.3063 0.3063 0.3063 0.3063
-----------------------------------------------------------------------------
All times are
0.2322 0.2345 0.2997 0.3063
0.2326 0.2363 0.2997 0.3063
0.2327 0.2362 0.2997 0.3063
0.2326 0.2363 0.2997 0.3063
-----------------------------------------------------------------------------
Sum of a is = 791.0156250437819
Sum of b is = 158.2031249860844
Sum of c is = 210.9374999724016
WEs
-- Wesley B. Jones, PhD wesley@sgi.com SGI, Boulder, CO Phone: (303)-448-1165 Performance Engineering FAX:
This archive was generated by hypermail 2b29 : Sat Aug 26 2000 - 11:13:36 CDT