SGI Origin 3800
8 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 = 40000000
Offset = 0
The total memory requirement is 915 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 149602 microseconds
(= 149602 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: 2855.43 0.2241 0.2254 0.2250 0.2250 0.2254
Scale: 2828.62 0.2263 0.2285 0.2269 0.2269 0.2264
Add: 3231.29 0.2971 0.2971 0.2971 0.2971 0.2971
Triad: 3347.17 0.2868 0.2869 0.2868 0.2868 0.2868
-----------------------------------------------------------------------------
All times are
0.2241 0.2285 0.2971 0.2868
0.2254 0.2265 0.2971 0.2869
0.2253 0.2263 0.2971 0.2868
0.2253 0.2263 0.2971 0.2868
-----------------------------------------------------------------------------
Sum of a is = 3164.062500175128
Sum of b is = 632.8124999443378
Sum of c is = 843.7499998896062
-- 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