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Message Startup Latencies


Table 1: Time for 1 Byte Messages
Wsock WMPI-C WMPI-J MPICH-C MPICH-J Linux-C Linux-J
SM 144.8 $\mu$s 67.2 $\mu$s 161.4 $\mu$s 148.7 $\mu$s 374.6 $\mu$s - $\mu$s - $\mu$s

DM

244.9 $\mu$s 623.9 $\mu$s 689.7 $\mu$s 679.1 $\mu$s 961.2 $\mu$s - $\mu$s - $\mu$s


In Table 1 we show the transmission time in microseconds (s) to send a 1 byte message in each of the environments tested. In SM the mpiJava wrapper adds an extra 94$\mu$s (140%) and 226$\mu$s (152%) compared to WMPI and MPICH C respectively. In DM the mpiJava wrapper adds an extra 66$\mu$s (11%) and 282$\mu$s (42%) compared to WMPI and MPICH C respectively. The Wsock figures are those for a WinSock implementation of PingPong benchmark using TCP. Linux results will be presented during the conference workshop.


next up previous
Next: Results in Shared Memory Up: Simple Communications Performance Measurement Previous: PingPong Communications Performance Tests
Bryan Carpenter 2002-07-11