Hi, sorry, I can not tell whether it is a common problem (I did not
encounter this). But I believed it is important to determine whether
it might come from the network issues.
F.
2014-12-02 11:16 GMT+01:00, Gupta, Ratnesh (GE Global Research,
Consultant) ratnesh.gu...@ge.com:
Hi Filip,
Yes, I tried multiprocessing on single node too. And the problem persists.
Is it a common problem with meep multiprocessing?
Thanks and Regards,
Ratnesh
-Original Message-
From: Filip Dominec [mailto:filip.domi...@gmail.com]
Sent: Tuesday, December 02, 2014 3:41 PM
To: Gupta, Ratnesh (GE Global Research, Consultant)
Subject: Re: [Meep-discuss] Slow calculation with meep parallelisation
Hi, I believed you might have problems with the inter-node communication in
the cluster; I wondered whether the problems pertain when the
multiprocessing is run on single node. Maybe you have tried this?
F. D.
2014-12-02 10:02 GMT+01:00, Gupta, Ratnesh (GE Global Research,
Consultant) ratnesh.gu...@ge.com:
Hi Filip,
Thanks for the quick reply. I didn't understand what you mean by
running on single node and using different -np option. Or if you meant
both separately.
I did try running on single node using '-np 1' with 'meep-mpi'. Also I
did try with strictly single node using 'meep'. 'meep' and 'meep-mpi with
-np 1'
took similar time for a smaller model but both ran out of memory for
the required geometry size giving the segmentation fault.
I hope I could clarify my problem.
Thanks and regards,
Ratnesh
-Original Message-
From: Filip Dominec [mailto:filip.domi...@gmail.com]
Sent: Tuesday, December 02, 2014 2:24 PM
To: Gupta, Ratnesh (GE Global Research, Consultant)
Subject: Re: [Meep-discuss] Slow calculation with meep parallelisation
Hi, Ratnesh,
it indeed seems to be an issue with multiprocessing - did you try to
run it on a strictly single node? How does it scale on it when you use
different -np option?
F.
2014-12-02 9:18 GMT+01:00, Gupta, Ratnesh (GE Global Research,
Consultant) ratnesh.gu...@ge.com:
Hi,
I've configured a cluster with meep-mpi. I am able to execute the
code. But the code while run with '-np 1' is completely run within
368 seconds where it took 410 seconds while run with '-np 2'.
Similarly, the time keeps increasing for increasing number of
processors which is not expected.
Also, I have a huge geometry which I want to simulate and is getting
segmentation fault with single processor. I hoped to run it with
multiple processor so that do decrease the probability of
segmentation fault.
Please help.
Thanks and Regards,
Ratnesh
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