[Beowulf] Beowulf cluster mpi problem

Benone Marcos benone.marcos at gmail.com
Fri Jan 6 16:45:24 EST 2006


chandru wrote:
> Hi,
> I have built a Linux cluster with a master and a
> slave. The communication medium is ssh. ssh works
> without any passwords. this has been acheived using
> the public keys. I have installed mpich 1.2.7 p1. I am
> using Fedora core 2.
> 
> when i run a mpi program on the master..
> 
> If i run mpirun nwith 1 processor everything works
> fine.
> 
> [root at master basic]# mpirun -np 1 cpi
> Process 0 of 1 on master.mydomain.com
> pi is approximately 3.1415926544231341, Error is
> 0.0000000008333410
> wall clock time = 0.000634
> 
> But if i run it with 2 procesors it gives me this
> error message
> 
> [root at master basic]# mpirun -np 2 cpi
> rm_3771:  p4_error: rm_start: net_conn_to_listener
> failed: 32902
> p0_4293:  p4_error: Child process exited while making
> connection to remote process on client1.mydomain.com:
> 0
> p0_4293: (10.253768) net_send: could not write to
> fd=4, errno = 32
> [root at master basic]#
> 
> I do not know where the problem is. I have updated the
> machines.LINUX file. it has the client's host name
> "client1.mydomain.com". SSH connection exists between
> master and client. 
> 
> Please help 
> 
> Thanks,
> Chandu
> 
> 
> 
> 		
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> 
Well, I believe the problem is that u have only 1 processor as the 
master doesnt count as a element processor (depending on configuration). 
Unless the node (slave) have more than 1 cpu, which thinking better 
still count as 1 cpu (node).
That's my shoots :)

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