SGI Origin 3800
4 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 = 20000000
Offset = 0
The total memory requirement is 457 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 150677 microseconds
(= 150677 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: 1400.62 0.2285 0.2290 0.2289 0.2289 0.2290
Scale: 1403.11 0.2281 0.2298 0.2293 0.2293 0.2298
Add: 1551.49 0.3094 0.3095 0.3094 0.3094 0.3094
Triad: 1574.27 0.3049 0.3049 0.3049 0.3049 0.3049
-----------------------------------------------------------------------------
All times are
0.2285 0.2281 0.3094 0.3049
0.2290 0.2297 0.3094 0.3049
0.2290 0.2298 0.3094 0.3049
0.2290 0.2297 0.3095 0.3049
-----------------------------------------------------------------------------
Sum of a is = 6328.125000350256
Sum of b is = 1265.624999888676
Sum of c is = 1687.499999779212
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