PSTSWM T3E-900 Point-to-Point Communication Performance

Performance Studies using

PSTSWM

SGI/Cray Research T3E-900 SWAP Performance

(ordered swap of 2MB message using SHMEM)

Date/Person: January 30, 1998 / P. Worley
Platform: T3E-900 at National Energy Research Scientific Computing Center (mcurie.nersc.gov):
   532 450-MHz DEC Alpha EV5 RISC processors
Environment: UNICOS/MK
PrgEnv 3
Cray CF90 Version 3.0.1.3
Communication Library: SHMEM
SWAP size: 262144 REAL*8 floating point values each direction
Message size: Largest - 262144 REAL*8 floating point values
Smallest - 256 REAL*8 floating point values
Processors: 0 and 1
Latency Definition:(T1024-T512)/512
Results:

ordered swap using nonblocking send
Data Statistics
unidirectional bandwidth estimated latency model error
(peak MByte/sec) (usec/msg) (max. rel. error)
1 iter. 326.59 6.12 1.9%
10 iter. 331.03 6.10 1.6%
1 iter. w/overlap 325.22 6.78 1.8%
10 iter. w/overlap 330.01 6.49 0.7%

ordered swap using nonblocking receive
Data Statistics
unidirectional bandwidth estimated latency model error
(peak MByte/sec) (usec/msg) (max. rel. error)
1 iter. 335.89 8.84 17.9%
10 iter. 340.91 8.74 17.8%
1 iter. w/overlap 352.96 9.33 17.1%
10 iter. w/overlap 358.20 8.77 18.0%

Patrick H. Worley / ( worleyph@ornl.gov)
Last Modified Monday, 15-Jul-2002 10:28:19 EDT.
86384 accesses since 1/2/96.