[BProc] Parallel jobs, multiple bpmasters?

[<gor...@ph...>]

On Tue, 16 Jul 2002 08:29:52 -0600 Erik Arjan Hendriks wrote:
>It is possible for a machine to be a master and slave for itself at
>the same time.  It's a pretty confusing arrangement though since
>processes will show up several times in the process tree.
>
>     . . .

Ideally, all of the processes in a parallel job would be created on the
master node and migrated to slave nodes.  It also appears to be possible
(see perl script at end) for a single bproc process on a slave node to
rfork itself off to other slave nodes.  The "ghost" processes only end up
on the master node, which is fine.

In this is the case, what advantage is there to having bpmaster run on
every node?


#!/usr/bin/perl
use Parallel::Bproc;
sub printhost {
      $host=`hostname`;
      print "I am $host\n";
}
printhost;
Parallel::Bproc::bproc_rfork(1) ;
printhost;
Parallel::Bproc::bproc_rfork(10) ;
printhost;
sleep 1000;

It appeared to work:

# /tmp/a.pl
I am lxsrvr0

I am lxsrva2

I am lxsrva11