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Old   November 2, 2010, 10:15
Default Running in Parallel on cluster
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Hello,

I'm trying to run a cache on my school cluster. Currently I'm issuing following command:

Code:
mpirun --hostfile system/machines -np 6 pimpleFoamScalar -parallel
With my hostfile:
Code:
XXX@top.nbi.dk slots=2 max-slots=2
XXX@charm.nbi.dk slots=2 max-slots=2
XXX@bottom.nbi.dk slots=2 max-slots=2
Which gives me following error:
Code:
[top.nbi.dk:18796] btl: tcp: attempting to connect() to address 130.225.212.8 on port 260
[top.nbi.dk][[19986,1],0][btl_tcp_endpoint.c:638:mca_btl_tcp_endpoint_complete_connect] connect() to 130.225.212.8 failed: No route to host (113)
From the google-searched I've done, I believe I have to properly set the --mca to something, but I've thus far been unsuccessful in doing so properly. I'm new to OpenMPI, and do not have a lot of experience with network interfaces etc.

Any help or clues as how to debug the problem would be appreciated!
Thank you.
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Old   November 2, 2010, 11:57
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There is a OpenFoam cluster receipe, in the second page, in this same forum.

Cluster OpenFOAM [Solved]

The translation to English is immediately below.
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Old   November 2, 2010, 12:04
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This does not solve my problem - The machines share the same network drive and I've decomposed, made the hostfile etc. correctly.
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Old   November 3, 2010, 17:20
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[top.nbi.dk][[19986,1],0][btl_tcp_endpoint.c:638:mca_btl_tcp_endpoint_comple te_connect] connect() to 130.225.212.8 failed: No route to host (113)

This looks like a network problem (misconfiguration?). First of all, check if you can
connect from one node of the cluster to any another node; e.g., like this:
telnet 130.225.212.8 260; if you get this message "no route to host", check the network configuration.
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