[Beowulf] Virginia Tech upgrade

Don Holmgren djholm at fnal.gov
Thu Jan 29 14:45:05 EST 2004


Here you go:

1 Copy of the IBM VAC version:

Function      Rate (MB/s)   RMS time     Min time     Max time
Copy:        2956.1260       0.0434       0.0433       0.0435
Scale:       2620.4804       0.0491       0.0488       0.0495
Add:         2308.5529       0.0833       0.0832       0.0837
Triad:       2371.3380       0.0810       0.0810       0.0812


2 simultaneous copies:

Function      Rate (MB/s)   RMS time     Min time     Max time
Copy:        1671.2143       0.0820       0.0766       0.0886
Scale:       1462.9393       0.0915       0.0875       0.0941
Add:         1296.6226       0.1519       0.1481       0.1575
Triad:       1378.7155       0.1425       0.1393       0.1507

Function      Rate (MB/s)   RMS time     Min time     Max time
Copy:        1569.2244       0.0845       0.0816       0.0893
Scale:       1470.4361       0.0891       0.0870       0.0929
Add:         1324.9507       0.1505       0.1449       0.1545
Triad:       1481.1049       0.1448       0.1296       0.1509


These results are consistent with the Fortran MPI version, run with np=1
and np=2:

bash-2.05a$ mpirun -np 1 stream_mpi
...
----------------------------------------------------
Function     Rate (MB/s)  Avg time   Min time  Max time
Copy:       2910.9423       .0220       .0220       .0220
Scale:      2577.4299       .0249       .0248       .0249
Add:        2385.3296       .0403       .0402       .0404
Triad:      2456.4980       .0391       .0391       .0392

bash-2.05a$ mpirun -np 2 stream_mpi
...
----------------------------------------------------
Function     Rate (MB/s)  Avg time   Min time  Max time
Copy:       2780.1300       .0465       .0460       .0469
Scale:      2779.6478       .0464       .0460       .0469
Add:        2649.7750       .0728       .0725       .0736
Triad:      2777.8189       .0698       .0691       .0709



Don



On Thu, 29 Jan 2004, Jeff Layton wrote:

> Don,
>
>    Is there any way you could run two copies of Stream
> at the same time, one on each CPU? I'd like to see the
> effect of the memory subsystem.
>
> Thanks!
>
> Jeff
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