Re: Attainable Memory Bandwidth (update)

From: raymond thomas pierrehumbert (rtp1@quads.uchicago.edu)
Date: Wed Oct 02 1991 - 21:44:04 CDT


For fans of antique hardware, I brought my aHPollo DN10k out of moth-
balls long enough to run the stream benchmark. The results are
really interesting (followup to alt.folklore.computers). I include
the DN10k results below.

                              Actual Transfer Rate (MB/s)
Machine Copy SSCAL Sum SAXPY
------------------------------------------------------------
Cray Y/MP 8 cpu 19291.6 19294.2 26588.9 26802.2
Cray Y/MP 4 cpu 9685.8 9678.9 13781.4 13851.2
Cray Y/MP 2426.4 2426.2 3454.4 3396.9
IBM RS6000-950 193.9 177.8 195.9 192.0
IBM RS6000-530 114.3 106.7 109.1 114.3
IBM RS6000-320 61.5 61.5 60.0 60.0
SGI 4D/35 53.5 36.9 48.0 42.4
HP 9000/730 53.3 48.0 55.4 55.4
HP 9000/720 43.6 40.0 45.0 42.3
aHPollo DN10010 41. 48. 54. 54.
SGI Indigo 34.3 22.9 27.7 26.7
Sun 670 28.2 32.0 30.0 30.0
DEC 5000 25.6 24.4 24.0 22.4
Sun 4/490 25.0 25.8 25.5 24.5
SGI 4D/240 18.4 16.5 19.8 19.0
Omron Luna88k 14.4 14.4 16.0 13.1
Sun SS1 14.1 12.3 13.6 13.1
SGI 4D/25 12.7 10.1 10.4 10.0
------------------------------------------------------------

Note the position of the DN10k relative to the "hot" new HP
machines. The Apollo architecture, which HP bought and then
allowed to die (for a variety of reasons) actually matches or
beats the snakes. This is on a machine first released three years
before the snakes. The 2x processor, if it had not been cancelled
for technical reasons, would have blown away the snakes on
bandwidth-limited applications, and been competitive with the IBM
machines.

This confirms my opinion that HP should have worked much harder to
keep the PRISM architecture alive.



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