HP9000/730 Memory Timings

From: Kurt Kufeld (kufeld_k@edhp01.uucp)
Date: Tue Oct 01 1991 - 21:56:44 CDT


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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