On Fri, 7 Feb 2003, Sean Dague wrote:
> > I like this idea... I remember trying to find a piece of software w/
> > this functionality. However, I also remember serious performance
> > considerations in having a local /etc/hosts for MPI purposes. I could
> > try to dig up details if you're interested. But the resulting action
> > was having an /etc/hosts file on each compute node to prevent it from
> > hitting a DNS server to find out about fellow nodes.
>
> How often is MPI bringing up or breaking down a socket? Unless its
> doing this multiple times a second, I doubt local DNS on the head node
> would play an effect in slowness. I've actually found that network
> lookups are faster than local lookups if the hosts file is large, as
> local lookups are always a linear scan of the file, and network lookups
> tend to be in memory on the server and in a hash table.
LAM/MPI only does name resolution at the beginning of time, and only on
one node.
Although I don't know for a fact, I'd be surprised if MPICH didn't do the
same.
--
{+} Jeff Squyres
{+} [EMAIL PROTECTED]
{+} http://www.lam-mpi.org/
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