Use that amount of processes. By default, there is the same number of processes as there are of hosts in the hostfile.
.TP
\fB\-trace\fR
-Equivalent to \fB–cfg\fR=\fItracing\fR:\fIyes\fR \fB–cfg\fR=\fItracing/smpi\fR:\fIyes\fR, activate the trace mecanism if available.
+Equivalent to \fB–cfg\fR=\fItracing\fR:\fIyes\fR \fB–cfg\fR=\fItracing/smpi\fR:\fIyes\fR, activate the trace mechanism if available.
.TP
\fB\-trace-ti\fR
Activate time independant tracing.