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Dear all,
I am trying to configure a new server with 4 MICs in it and I am having a problem running MPI jobs.
I can run a job correctly from the Xeon Phi after copying the mpirun binary over to the mic.
mpirun -hosts mic0,mic1,mic2,mic3 -n 4 -ppn 1 ./a.out
This works, but when I try to start the job from the host with "export I_MPI_MIC=enable"
I get the following error message:
[proxy:0:0@appliance2-mic0] HYDU_sock_connect (../../utils/sock/sock.c:268): unable to connect from "appliance2-mic0" to "127.0.0.1" (Connection refused)
[proxy:0:0@appliance2-mic0] main (../../pm/pmiserv/pmip.c:372): unable to connect to server 127.0.0.1 at port 45392 (check for firewalls!)
I have my host firewall disabled so I am not really sure how to diagnose this.
Best regards,
Alastair
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Do you have /opt/intel available via NFS on the coprocessor? If not, you will need to ensure that pmi_proxy (along with whichever MPI libraries you have linked) is available in the path on the coprocessor.
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Firewall likely blocks the communication between the host and coprocessors, would you like to double check if the firewall is disabled totally? There is a thread in the forum reporting the same symptom ( https://software.intel.com/en-us/forums/topic/392468 ) and the user just disables the firewall to resolve the issue.
For more information, please refer to https://software.intel.com/en-us/articles/firewalls-and-mpi
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Hello Alastair,
I would like to follow up on the issue about starting MPI job on host system. I hope you were able to resolve the issue.
Regards,
Sunny
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