Multi-cpu computation HPMPI problem

crevoise · March 28, 2012, 04:54

Hello everybody.

I have installed recently starcd on a new computer, and I am facing with a problem when trying to ran a computation on several CPU.

I am able to run Starcd on 1CPU, without problem.
I can also run several single-CPU computation at the same time.

However, when trying to run the computation on 2 or more CPU, I am getting the following error message:
mpirun: gethostbyname(crevoise) failed
mpirun: Cannot find IP for mpirun matching crevoise

It seems HPMPI is trying to access different IP address for each CPU?

Does somebody already faced with that problem and have some hint to solve it?

Thanks

/Crevoise

crevoise · February 26, 2014, 04:32

(this is explained in the manual, but sometime one might just miss the info - p95 in the manual version 8.04)
If you are facing the same issue, then you should just add the following command:
-rsh ssh
into the window appearing when opening a new computation.
On that window, if you select "parallel on local host", 'compute processes 2" for example, the command line at the bottom is something like
path*** -server -np 2
just add -rsh ssh after -server, and it should work
(assuming you had the same problem as mine)

Hope this help

March 28, 2012, 04:54	Multi-cpu computation HPMPI problem	#1
crevoise Member Join Date: Oct 2011 Location: Thessaloniki, Greece Posts: 75 Rep Power: 14	Hello everybody. I have installed recently starcd on a new computer, and I am facing with a problem when trying to ran a computation on several CPU. I am able to run Starcd on 1CPU, without problem. I can also run several single-CPU computation at the same time. However, when trying to run the computation on 2 or more CPU, I am getting the following error message: mpirun: gethostbyname(crevoise) failed mpirun: Cannot find IP for mpirun matching crevoise It seems HPMPI is trying to access different IP address for each CPU? Does somebody already faced with that problem and have some hint to solve it? Thanks /Crevoise

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February 26, 2014, 04:32		#2
crevoise Member Join Date: Oct 2011 Location: Thessaloniki, Greece Posts: 75 Rep Power: 14	(this is explained in the manual, but sometime one might just miss the info - p95 in the manual version 8.04) If you are facing the same issue, then you should just add the following command: -rsh ssh into the window appearing when opening a new computation. On that window, if you select "parallel on local host", 'compute processes 2" for example, the command line at the bottom is something like path*** -server -np 2 just add -rsh ssh after -server, and it should work (assuming you had the same problem as mine) Hope this help