Hi, Pavan, Thanks a lot for trying that. I have enabled inbound traffic for all types of protocols including tcp, udp and icmp for all ports (0 - 65535) and for all ip addresses. I noticed that the two instances you created are from the same region (us west I suppose). The thing is, for instances in the same region, mpiexec can run successfully with no problem in my setup. But when I run mpi programs across regions, in my case, between an instance in us east and an instance in us west, the error in MPI_Send appears. It seems that there might be some problems with the firewall or network interfaces, but I have checked and ruled out those possibilities (instances in different regions can ssh and scp to each other and there's no dropping rule in my firewall setting). So that's where I'm confused. Regards, Amelie On Wed, Mar 16, 2016 at 1:01 PM, Balaji, Pavan <[email protected]> wrote:

...

On Mar 15, 2016, at 10:26 PM, amelie chi zhou <[email protected]> wrote: Here is the full output info. Thanks!

The IP addresses and ports seem to be correctly setup, so that's not the problem.

I created my own amazon instances to see what the problem is. It looks like the instances are not able to communicate even though there's no explicit firewall enabled that is shown inside the Linux instance. I did some digging and found the "Security group" settings and found that the inbound rules only allowed ssh. I changed it to "All traffic" and now I can run my jobs fine.

% ./install/bin/mpiexec -hosts ec2-52-36-15-57.us-west-2.compute.amazonaws.com,ec2-5 2-37-222-189.us-west-2.compute.amazonaws.com -n 4 ./examples/cpi Process 3 of 4 is on ip-172-31-28-127 Process 2 of 4 is on ip-172-31-21-12 Process 1 of 4 is on ip-172-31-28-127 Process 0 of 4 is on ip-172-31-21-12 pi is approximately 3.1415926544231243, Error is 0.0000000008333312 wall clock time = 0.010181

Can you try that?

-- Pavan

_______________________________________________ discuss mailing list [email protected] To manage subscription options or unsubscribe: https://lists.mpich.org/mailman/listinfo/discuss

_______________________________________________ discuss mailing list [email protected] To manage subscription options or unsubscribe: https://lists.mpich.org/mailman/listinfo/discuss