Reconstruction problem while using parallel processors

Cara Gao · September 14, 2014, 17:11

Hi, Formers,

I am using parallel processors (64) to compute a case with a 6 million mesh. The computing process is OK, but it takes a lot of time to reconstruct after the computation is done, almost one day. Is this normal? or this indicates something wrong with my case? Is there anybody who has ever met the the same problem with me?

Thanks,

Best,
Cara

vbchris · September 14, 2014, 19:44

How many time steps it is reconstructing, and is the mesh dynamic or the same for all timesteps?

Edit:

I've only reconstructed upto 20 cores, but it seemed to me that the time for reconstructing gets quite long at larger core counts.

Cara Gao · September 14, 2014, 19:59

Hi, Chris,
I have less than 100 steps to reconstruct and the case is a transient case. I guess maybe that is the reason for the low speed. And indeed, the reconstuction time increses a lot with the increase of number of processors.

Best,
Fei

wyldckat · September 21, 2014, 13:50

Allow me to repeat myself from this post: http://www.cfd-online.com/Forums/ope...structpar.html

Quote:

Quick answer: http://www.cfd-online.com/Forums/ope...structpar.html

September 14, 2014, 17:11	Reconstruction problem while using parallel processors	#1
Cara Gao New Member Fei Gao Join Date: Aug 2014 Posts: 12 Rep Power: 11	Hi, Formers, I am using parallel processors (64) to compute a case with a 6 million mesh. The computing process is OK, but it takes a lot of time to reconstruct after the computation is done, almost one day. Is this normal? or this indicates something wrong with my case? Is there anybody who has ever met the the same problem with me? Thanks, Best, Cara

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September 14, 2014, 19:44		#2
vbchris Member Chris L Join Date: Sep 2012 Posts: 53 Rep Power: 13	How many time steps it is reconstructing, and is the mesh dynamic or the same for all timesteps? Edit: I've only reconstructed upto 20 cores, but it seemed to me that the time for reconstructing gets quite long at larger core counts.

September 14, 2014, 19:59		#3
Cara Gao New Member Fei Gao Join Date: Aug 2014 Posts: 12 Rep Power: 11	Hi, Chris, I have less than 100 steps to reconstruct and the case is a transient case. I guess maybe that is the reason for the low speed. And indeed, the reconstuction time increses a lot with the increase of number of processors. Best, Fei