Re: Attainable memory bandwidth

From: David Blythe (blythe@banshee.asd.sgi.com)
Date: Sun Sep 29 1991 - 19:20:38 CDT


In article <MCCALPIN.91Sep27212326@pereland.cms.udel.edu> you write:
>==========================================================
>Memory Transfer Rates in MB/s for Standard Fortran Kernels
>==========================================================
>John D. McCalpin September 24, 1991
>mccalpin@perelandra.cms.udel.edu DELOCN::MCCALPIN
>
>I am ***very*** interested in results from the following:
> HP 7x0 machines
> SGI 4D/35
> SGI Indigo
> Sun SPARC 2
>I would appreciate any data that people could send along!

since you ask, here are the numbers for Indigo and for a 4D/440. I didn't
see any handy 35s around, maybe someone else will send them.

SGI 4D/440 \w 256Mb 64K instr cache + 64K data cache + 1Mb secondary cache

 Timing calibration ; t = 35.99999 clicks
      
 Assignment: Rate = 44.44445 MB/s MFLOPS = 0.0000000E+00
 Scaling: Rate = 29.09091 MB/s MFLOPS = 1.818182
 Summing: Rate = 47.05882 MB/s MFLOPS = 1.960784
 SAXPYing: Rate = 32.87671 MB/s MFLOPS = 2.739726

SGI Indigo \w 16Mb 32K instr cache 32K data cache

 Timing calibration ; t = 23.99999 clicks
      
 Assignment: Rate = 66.66669 MB/s MFLOPS = 0.0000000E+00
 Scaling: Rate = 27.58620 MB/s MFLOPS = 1.724138
 Summing: Rate = 57.14288 MB/s MFLOPS = 2.380953
 SAXPYing: Rate = 34.78259 MB/s MFLOPS = 2.898550

        david blythe
        blythe@sgi.com



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