SGI Origin 3800
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 = 640000000
Offset = 0
The total memory requirement is 14648 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 168363 microseconds
(= 168363 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: 43264.76 0.2367 0.2380 0.2375 0.2375 0.2378
Scale: 42975.19 0.2383 0.2416 0.2403 0.2403 0.2407
Add: 50937.02 0.3015 0.3029 0.3023 0.3023 0.3025
Triad: 50562.21 0.3038 0.3047 0.3043 0.3043 0.3042
-----------------------------------------------------------------------------
All times are
0.2375 0.2383 0.3029 0.3041
0.2380 0.2406 0.3020 0.3047
0.2376 0.2409 0.3029 0.3038
0.2367 0.2416 0.3015 0.3047
-----------------------------------------------------------------------------
Sum of a is = 197.7539062609455
Sum of b is = 39.55078124652111
Sum of c is = 52.73437499310039
Note: Some output has been modified to handle supercomputer class problem.
E.G. output of array size changed from i4 to i6. Code available if required.
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 : Fri Aug 25 2000 - 08:47:08 CDT