[mpich-discuss] MPI_Recv crashes with mpd ring

[Jain, Rohit]

Thanks everyone for responses. I got around ssh issue.

But, it seems some more setup is required to make hydra work:

mpiexec.hydra -f hosts -n 4 a.exec arg1 : a.exec arg2 : a.exec arg3 :
a.exec arg4
[proxy at hansel] HYDU_create_process
(/mpich/src/mpich2-1.2.1p1/src/pm/hydra/utils/launch/launch.c:72):
execvp error on file a.exec (No such file or directory)
[proxy at hansel] HYDU_create_process
(/mpich/src/mpich2-1.2.1p1/src/pm/hydra/utils/launch/launch.c:72):
execvp error on file a.exec (No such file or directory)


Regards,
Rohit


-----Original Message-----
From: mpich-discuss-bounces at mcs.anl.gov
[mailto:mpich-discuss-bounces at mcs.anl.gov] On Behalf Of Dave Goodell
Sent: Tuesday, February 15, 2011 7:21 PM
To: mpich-discuss at mcs.anl.gov
Subject: Re: [mpich-discuss] MPI_Recv crashes with mpd ring

On Feb 15, 2011, at 5:52 PM CST, Jain, Rohit wrote:

> I had 1.2.1p1 built locally. So, I tried that. It also gave me same
fatal error. I will try newer version, but I am less hopeful.

There's a good chance that there is a bug in your code, since 1.0.6 was
not fundamentally a broken version of MPICH2.  However, it is important
for you to use a fairly recent version so that we can rule out the ~3-4
years of bugs that have been fixed since 1.0.6 was released.  Also,
error messages and debugging facilities are typically only improved in
later versions of MPICH2, which could help you track down your problem.
You should attempt to debug your program in all of the usual ways, such
as by enabling core dumps or running valgrind on your program.

> I am trying to use hydra (mpiexec.hydra) with 1.2.1.p1, but getting
some startup errors:
>  
> The authenticity of host 'XXX' can't be established.
> RSA key fingerprint is ed:ce:ca:7b:08:b9:49:fd:f6:af:14.
> Are you sure you want to continue connecting (yes/no)? 
> The authenticity of host 'XXX2' can't be established.
> RSA key fingerprint is fb:1b:7b:0c:bb:b1:a6:b1:7d:dc:05.
>  
> Any pointers how to resolve them?

See Pavan's mail for some tips here.

-Dave


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