[Beowulf] Virginia Tech upgrade

Bill Broadley bill at math.ucdavis.edu
Tue Jan 27 23:43:54 EST 2004


On Tue, Jan 27, 2004 at 09:09:33PM -0500, Mark Hahn wrote:
> I draw several conclusions from the VT cluster:
> 
> 	- HPL is very cache-friendly.  the dual-G5 has an impressive peak
> 	flops rating, but pretty mediocre memory bandwidth.  anyone have a 
> 	Stream result for a G5?  I'd guess around 2.5 GB/s.


gcc -v # default for osx-10.3
Reading specs from /usr/libexec/gcc/darwin/ppc/3.3/specs
Thread model: posix
gcc version 3.3 20030304 (Apple Computer, Inc. build 1495)

gcc -O1 stream_d.c second_wall.c
Total memory required = 183.1 MB.
Function      Rate (MB/s)   RMS time     Min time     Max time
Copy:        2040.0621       0.0629       0.0627       0.0632
Scale:       2055.3702       0.0624       0.0623       0.0631
Add:         2141.2825       0.0901       0.0897       0.0908
Triad:       2100.9326       0.0917       0.0914       0.0921

-O2
Function      Rate (MB/s)   RMS time     Min time     Max time
Copy:        2058.1437       0.0626       0.0622       0.0630
Scale:       1987.8218       0.0646       0.0644       0.0647
Add:         2150.3450       0.0897       0.0893       0.0902
Triad:       2155.9465       0.0893       0.0891       0.0895

-O3
Function      Rate (MB/s)   RMS time     Min time     Max time
Copy:        2053.5855       0.0625       0.0623       0.0629
Scale:       1985.6382       0.0646       0.0645       0.0651
Add:         2148.7557       0.0897       0.0894       0.0901
Triad:       2155.1214       0.0894       0.0891       0.0896

-- 
Bill Broadley
Computational Science and Engineering
UC Davis
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