SGI Origin 3800
64 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 = 320000000
Offset = 0
The total memory requirement is 7324 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 156029 microseconds
(= 156029 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: 21824.30 0.2346 0.2357 0.2354 0.2354 0.2357
Scale: 21953.05 0.2332 0.2344 0.2341 0.2341 0.2344
Add: 24815.98 0.3095 0.3095 0.3095 0.3095 0.3095
Triad: 25201.69 0.3047 0.3048 0.3048 0.3048 0.3048
-----------------------------------------------------------------------------
All times are
0.2346 0.2332 0.3095 0.3048
0.2357 0.2344 0.3095 0.3048
0.2357 0.2344 0.3095 0.3047
0.2357 0.2344 0.3095 0.3048
-----------------------------------------------------------------------------
Sum of a is = 395.5078125218910
Sum of b is = 79.10156249304222
Sum of c is = 105.4687499862008
-- 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