Re: [BProc] bproc 4.0 bproc_nodeinfo issue

[Daniel G. <dg...@ti...>]

LAM runs fine on bproc 3.x, and it does NOT use the master to run the 
parallel jobs, so no need to worry about that.  LAM just needs to know who
the master is, in order to submit the parallel stuff on the slave nodes.

Brian's problem is that the bproc API has changed sufficiently that all sorts
of things have broken in LAM, and one must make sure what it is that 
functions such as bproc_nodeinfo() bproc_nodestatus actually return.

Daniel

On Thu, Jun 10, 2004 at 11:13:36PM -0500, Luke wrote:
> You may want to note that -3 means BPROC_NODE_NONE.  From my debugging 
> runs, on the first pass through that loop you're getting back garbage in 
> the string from bproc_nodestatus.
> 
> I definitely agree with Greg as well-  Unless there's something about 
> LAM on bproc that I'm missing, it would be bad to require that parallel 
> processes are present on the master.
> 
> -Luke
> 
> Greg Watson wrote:
> 
> > Brian,
> >
> > Actually BProc uses -1 to designate the master node. Slave nodes are 
> > numbered starting from 0, and in the BProc world the master is treated 
> > differently from the slaves. You could try calling bproc_nodeinfo() 
> > with -1 for the first argument.
> >
> > I would try and avoid running any applications on the master, since it 
> > is critical to the operation of the cluster.
> >
> > Also, your error messages seem to indicate you're trying to look up 
> > node -3. This is probably wrong.
> >
> > Regards,
> >
> > Greg 
> 
> 
> 
> 
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-- 

Dr. Daniel Gruner                        dg...@ti...
Dept. of Chemistry                       dan...@ut...
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