SGI Origin 3800
16 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 = 80000000
Offset = 0
The total memory requirement is 1831 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 154598 microseconds
(= 154598 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: 5534.40 0.2313 0.2318 0.2317 0.2317 0.2318
Scale: 5493.65 0.2330 0.2342 0.2339 0.2339 0.2342
Add: 6438.57 0.2982 0.2982 0.2982 0.2982 0.2982
Triad: 6397.87 0.3001 0.3002 0.3002 0.3002 0.3002
-----------------------------------------------------------------------------
All times are
0.2313 0.2330 0.2982 0.3001
0.2318 0.2342 0.2982 0.3002
0.2318 0.2342 0.2982 0.3002
0.2318 0.2342 0.2982 0.3001
-----------------------------------------------------------------------------
Sum of a is = 1582.031250087564
Sum of b is = 316.4062499721689
Sum of c is = 421.8749999448031
-- 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