Scyld and pvfs ...

Rafael R. Pappalardo rafapa at
Wed Nov 15 07:30:48 EST 2000

On Tue, 14 Nov 2000, Daniel Ridge wrote:

> Franz,
> On Tue, 14 Nov 2000, Franz Marini wrote:
> > 4) (quite a long list of questions ...) we're using the CPMD
> > (Carr-Parrinello Molecur Dynamics) program on our current beowulf, but we
> > have some performance problems w/ mpich 1.2.1 (w/ or without mpd). It
> > seems like it uses LOTS of all2all comms. Has someone tried it w/ Scyld ?
> Scyld Beowulf isn't tied to MPICH especially. Our changes are actually
> quite slight and can be easily applied to just about any other message
> passing system.
> Many parallel systems will work just fine if you tell them to use 'bpsh'
> instead of 'rsh'. bpsh will use the copy of the binary installed on the
> frontend.
> Other systems require a bit more help. In particular, systems which expect
> to put a daemon on each node will need help -- as the remote systems
> probably don't have a copy of the target binary to execute.

Dear Sir,
I would like to known if this comment apply to LAM mpi. I believe that LAM
needs a daemon in each slave.

Thanks for the help.

Rafael R. Pappalardo
Dept. Quimica Fisica, Fac. de Quimica, Univ. de Sevilla (SPAIN)
e-mail: rafapa at

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