PSTSWM T3E-900 Point-to-Point Communication Performance

Performance Studies using

PSTSWM

SGI/Cray Research T3E-900 SWAP Performance

(ordered swap of 8KB 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: 1024 REAL*8 floating point values each direction
Message size: Largest - 1024 REAL*8 floating point values
Smallest - 1 REAL*8 floating point value
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. 180.32 5.73 12.6%
10 iter. 211.75 5.64 29.2%
1 iter. w/overlap 166.75 6.26 18.4%
10 iter. w/overlap 207.21 5.83 29.5%

ordered swap using nonblocking receive
Data Statistics
unidirectional bandwidth estimated latency model error
(peak MByte/sec) (usec/msg) (max. rel. error)
1 iter. 210.17 5.25 13.5%
10 iter. 234.91 5.07 29.1%
1 iter. w/overlap 209.84 5.62 14.4%
10 iter. w/overlap 240.34 5.02 29.4%

Patrick H. Worley / ( worleyph@ornl.gov)
Last Modified Monday, 15-Jul-2002 10:28:23 EDT.
87252 accesses since 1/2/96.