John:
Here are the results of the memory bandwidth test on a 730. I was
unable to run them even with "n" set to 1 000 000 and 500 000 set for single
and double precision. I had to reduce the value of "n" to 600 000 and 300 000
for single and double respectively. It coredumped otherwise.
Lucky one of our systems has a Fortran compiler.
If these test are good enough, let me know. If there is some way
to get them to run with a larger value of n let me know. I did not dig deeply
into the code.
Here are the specifics:
Hardware: HP9000/730, 32 Mbytes of memory
O.S.: HP-UX 08.05
Compilers:
C: HP C/ANSI C compiler
flags: +O3 -osecond
Fortran:HP fortran
flags: -O -sstream_x
If I'm missing anything, let me know.
Let me know how we compare. I missed your initial comparisons.
--------------------------------------
Double precision appears to have 16 digits of accuracy
Assuming 8 bytes per DOUBLEPRECISION word
--------------------------------------
Timing calibration ; time = 27.00000014156103 hundredths of a second
Increase the size of the arrays if this is <30
and your clock precision is =<1/100 second
---------------------------------------------------
Function Rate (MB/s) RMS time Min time Max time
Assignment: 53.3334 .0951 .0900 .1000
Scaling : 48.0000 .1000 .1000 .1000
Summing : 55.3847 .1300 .1300 .1300
SAXPYing : 55.3848 .1381 .1300 .1400
--------------------------------------
Single precision appears to have 7 digits of accuracy
Assuming 4 bytes per default REAL word
--------------------------------------
Timing calibration ; time = 31.0 hundredths of a second
Increase the size of the arrays if this is <30
and your clock precision is =<1/100 second
---------------------------------------------------
Function Rate (MB/s) RMS time Min time Max time
Assignment: 40.0000 .1231 .1200 .1300
Scaling : 36.9231 .1310 .1300 .1400
Summing : 45.0000 .1661 .1600 .1700
SAXPYing : 40.0000 .1841 .1800 .1900
*****************************************************************************
Kurt Kufeld
kufeld_k%ipl@cs.ualberta.ca
(403) 420-5330
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