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From: Jeff Squyres (jsquyres_at_[hidden])
Date: 2007-04-04 15:28:14


On Apr 3, 2007, at 1:22 PM, Heywood, Todd wrote:

> ssh: connect to host blade45 port 22: No route to host
> [blade1:05832] ERROR: A daemon on node blade45 failed to start as
> expected.
> [blade1:05832] ERROR: There may be more information available from
> [blade1:05832] ERROR: the remote shell (see above).
> [blade1:05832] ERROR: The daemon exited unexpectedly with status 1.
> [blade1:05832] [0,0,0] ORTE_ERROR_LOG: Timeout in file
> ../../../../orte/mca/pls/base/pls_base_orted_cmds.c at line 188
> [blade1:05832] [0,0,0] ORTE_ERROR_LOG: Timeout in file
> ../../../../../orte/mca/pls/rsh/pls_rsh_module.c at line 1187
>
> I can understand this arising from an ssh bottleneck, with a
> timeout. So, a
> question to the OMPI folks: could the "no route to host" (113)
> error in
> btl_tcp_endpoint.c:572 also result from a timeout?

I think it *could*, but it's really an OS-level question. OMPI is
simply reporting what errno is giving us back from a failed TCP
connect() API call.

The timeout shown in the error message above is really an ORTE
timeout, meaning that we waited for a daemon to start that didn't, so
we timed out and gave up. It's on the "to do" list to recognize
quicker that an ssh failed (or any of the other starters failed --
SLURM/srun failures behaves similarly to ssh failures right now)
faster than a timeout, probably not until at least the 1.3 timeframe,
however.

-- 
Jeff Squyres
Cisco Systems