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Message Startup Latencies


Table 4.2: Time for 1 Byte Messages
Wsock WMPI-C WMPI-J MPICH-C MPICH-J
SM 144.8 $\mu$s 67.2 $\mu$s 161.4 $\mu$s 148.7 $\mu$s 374.6 $\mu$s

DM

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


In Table 4.2 we show the transmission time in microseconds ($\mu$s) to send a 1 byte message in each of the environments tested. In shared memory mode (SM) the mpiJava wrapper adds an extra 94$\mu$s (140%) and 226$\mu$s (152%) compared to WMPI and MPICH C respectively. In distributed memory mode (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.


next up previous contents
Next: Results in Shared Memory Up: Simple Communications Performance Measurement Previous: PingPong Communications Performance Tests   Contents
Bryan Carpenter 2004-06-09