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core dump - engrid or machine limitation

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Old   December 12, 2013, 09:09
Default core dump - engrid or machine limitation
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Georg Brösigke
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Dear Bruno, dear Oliver,

for a mesh resolution study I would like to generate a mesh as fine as possible. At the moment I struggle to generate a boundary layer, where the surface mesh contains more than 2M surface cells (engrid 1.4). (Error: 3698 Speicherzugriffsfehler (Speicherabzug geschrieben))
In the old forum I read that only volume meshes of ~8M cells were generated in engrid so far (in 2010), so I ask myself if the limitation in engrid is reached or if my machine limits me in generating finer Meshes (32 GB RAM, no swap) As far as I see, the memory is not consumed at time of abortion...
What Meshsize is known to be generated successfully?

best regards

Georg
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Old   December 15, 2013, 15:53
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Bruno Santos
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Hi Georg,

Are you positive that the engrid binary was built as a 64bit application?
You can confirm this by running:
Code:
file engrid
from within the folder where the binary is located (possibly "engrid/src"). If you can run it from any folder, then you can use this command:
Code:
file $(which engrid)
Among the first things it should tell you should be this:
Code:
engrid: ELF 64-bit LSB executable, x86-64
Best regards,
Bruno
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Old   December 15, 2013, 16:06
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Georg Brösigke
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Dear Bruno,

yes, I can confirm that engrid was built as 64bit application. Got the output
Code:
engrid: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.24, BuildID[sha1]=0x5a355b4b14a461551d3c213e1cea9fd2c66bf454, not stripped
best regards, Georg
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Old   December 25, 2013, 13:55
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Bruno Santos
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Hi Georg,

I'm on vacation these coming days, so I could use more specific information on the kind of test case I should be trying to do (number of surface mesh faces, volume mesh characteristics and so on). If you could share such a case would be great.

Because if my guess is correct, there is a limitation in the number of faces count to 2 million or 4 million, but I need a test case to isolate this.

Best regards,
Bruno
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