Message Start up latencies

Table 1: Times for 1byte messages.

	WMPI-C	WMPI-J	MPICH-C	MPICH-J
SM	67.2 $\mu$s	161.4 $\mu$s	148.7 $\mu$s	374.6 $\mu$s
DM	623.3 $\mu$s	689.7 $\mu$s	679.1 $\mu$s	961.2 $\mu$s

In Table 1 we show the transmission time in microseconds 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 with WMPI and MPICH C respectively. In DM the mpiJava wrapper adds and extra 66 $\mu$s (11%) and 282 $\mu$s (42%) compared to WMPI and MPICH C respectively.