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February 7, 2012, 18:01 |
Nodes per Core restriction?
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#1 | |
Member
Max
Join Date: Apr 2011
Posts: 47
Rep Power: 14 |
Is there a nodes per core restriction in CFX (educational)?
I have a 11mil cell mesh. If I run it on serial I get an error (something like to many integer values see below) If I run it on more cores, it works. I dont get that. Any ideas? ERROR: Quote:
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February 7, 2012, 22:58 |
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#2 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,665
Rep Power: 143 |
Wow, that is one big simulation - 2 billion for the real stack. Then clearly having a single simulation of this size is not possible, but if you split it up into some parallel runs it is.
I was not aware that this restriction existed. |
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February 8, 2012, 10:03 |
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#3 |
Member
Max
Join Date: Apr 2011
Posts: 47
Rep Power: 14 |
I honestly don"t know whats blowing up the real stack.
Well, the cell count is high, its a duct with a wedge, hexa meshed for y+ around 1. I will be probably using it for running high volume concentration particle tracking, comparing it to experiments and DEM. But thats just the first mesh validation for water with SST. 7Eq. I was just wondering if that's a known issue. But since it runs parallel, it must be some limit on the single core runs. Thanks Max |
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February 8, 2012, 11:03 |
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#4 |
Senior Member
Join Date: Apr 2009
Posts: 531
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There is a hard limit of that many words per stack per partition. It corresponds to about 16GB I think. Running in parallel reduces the memory required per partition, so you can drop below this limit.
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June 8, 2013, 06:46 |
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#5 |
New Member
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No there is no restrictions for nodes per core in CFX (educational) as I know. The same problem I am also getting. The simulation will not show any error if it is run on parallel machines.
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June 10, 2013, 23:26 |
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#6 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,665
Rep Power: 143 |
Stumpy's post answers the question - you need to run enough partitions to get all partitions below this stack limit. This stack limit will apply for the educational version of the software as well.
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