[Beowulf] Thought that this might be of interest

[Joe Landman]

We are working on a machine with 2 Opteron 2218s.  For laughs, I ran 
streams on it.  Here are 1,2,3,4 processor data.

1 processor:

Copy:       5713.9944      0.0591      0.0560      0.0600
Scale:      5713.9822      0.0587      0.0560      0.0600
Add:        5454.2389      0.0911      0.0880      0.0920
Triad:      5454.1576      0.0916      0.0880      0.0920


2 processors:

Function     Rate (MB/s)  Avg time   Min time  Max time
Copy:       5713.8788      0.0591      0.0560      0.0640
Scale:      5713.9822      0.0596      0.0560      0.0640
Add:        5713.9538      0.0858      0.0840      0.0880
Triad:      5713.9538      0.0871      0.0840      0.0880


3 processors:

Copy:       8888.4000      0.0391      0.0360      0.0400
Scale:      8888.4147      0.0391      0.0360      0.0400
Add:        8570.9733      0.0573      0.0560      0.0600
Triad:      8570.9551      0.0587      0.0560      0.0600


4 processors:

Copy:      11428.1834      0.0293      0.0280      0.0320
Scale:     11428.1347      0.0298      0.0280      0.0320
Add:       10908.5812      0.0449      0.0440      0.0480
Triad:     10908.6107      0.0440      0.0440      0.0440



I did get one outlier at 4 CPUs.  Could be a timing glitch.

4 processors:
Copy:      13332.7765      0.0302      0.0240      0.0360
Scale:     13332.7765      0.0262      0.0240      0.0320
Add:       13332.6220      0.0400      0.0360      0.0480
Triad:     14999.0756      0.0391      0.0320      0.0480

This is a dual socket 1207 motherboard.  DDR2/533 ECC Registered memory 
(will look back and check to be sure).

Initial benchmarks (2.6 GHz clock) put it at about 17% faster than 
Opteron 275 and Woodcrest 5150 (2.66 GHz) on a GAMESS test we use (1h41m 
for Woodcrest and 275, and 1h26m for this unit).

Joe

-- 
Joseph Landman, Ph.D
Founder and CEO
Scalable Informatics LLC,
email: landman at scalableinformatics.com
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