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Please help me.. Out of memory İn gambit

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Old   October 10, 2011, 12:19
Default Please help me.. Out of memory İn gambit
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Emre G
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i have these system specifications:
- i7 2600 intel 64x
- 8 gb ram
- 4 processors

I am trying to mesh a volume which has nearly 4-5 million cell. However suddenly i get a warning message "out of memory" in GAMBIT

But on the another computer (2 gb ram, dual core) i can manage 4.5 million meshes in the same conditions.

Where is the problem?

Thanks
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Old   October 10, 2011, 15:05
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Any chance your running a different OS (Operating system)?

If it's 32bit, then your maximum array is limited to 2^31 bits or roughly 2Gb.

Otherwise make sure your compiler setting are the same.

Heh, 2 million grid cells, gotta love Gambit for it's inefficient use of computer memory ^^ (and friendly user interface!)
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Old   October 10, 2011, 16:39
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thanks for ur reply.
Probably i hav got it. While u are meshin for ex. 5 million mesh at once, Gambit doesnt allow us to be successed.
- We have to mesh the volumes by one by.
- or stitch in fluent.
- or less refined mesh. (not desired)

Now i hav 10 million mesh
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Old   October 11, 2011, 01:23
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Maxime Perelli
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Quote:
Originally Posted by emreg View Post
Probably i hav got it. While u are meshin for ex. 5 million mesh at once, Gambit doesnt allow us to be successed.
- We have to mesh the volumes by one by.
Not probably, but for sure!
The problem, will be when you will import your mesh in your solver, or even export your mesh (if you are on 32bit-OS).
I also have 8GB Ram but on XP-32bit. (so only 3.5GB Ram)
My solution was to create a 64bit-linux partition (openSuse, fedora, or whatever... but free), and installing Gambit 64bit for linux, and also 64-bit version of solver.
And it works perfectly
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Old   October 11, 2011, 05:09
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while using solver say ansys or fluent in it try parallel computing otherwise calculations will stop after sometime or may be does'nt even start!
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Old   October 11, 2011, 05:17
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That's what I meant.
which OS?
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Old   October 11, 2011, 05:51
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yeah i got your point max but for person working on 32 bit and windows with limited RAM parallel computing can simply solve the problem. Whatsoever be the OS that wont make any difference! i am working almost same mesh mesh count on 3gb ram 32 bit window just with parallel computing!
definitely if give me some more options,i will be thankful
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Old   October 11, 2011, 07:09
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what kind of parallel computing?
Shared memory or distributed?
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Old   October 11, 2011, 16:07
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After exporting mesh file consisting of 13million cells, on a computer (8 gb ram, 4 processor) i couldnt start calculating in fluent ( it is definitely very slow). It was so slow that i had to cancel it.

Do you have any idea about that?
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Old   October 12, 2011, 02:04
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Generally you need 1GB Ram for 1 million cells mesh.
That's why it's slow.
>>solutions:
*Reduce Number of cells
*increase Ram capacity
*parallel computation (distributed memory)
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Old   October 19, 2011, 01:09
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sir ,

i while i start gambit 2.0.4 , i could not get the window displayed , it gives me following command , in my DOS window .

C:\Documents~1\SUBASH\C:\Fluent.Inc\ntbin\ntx86\\g ambit.exe
ERROR:IDENTIFIER "default_id" CURRENTLY OPEN.
usage:C:\Fluent.Inc\gambit2.0.4\ntx86\\gambit.exe.
-def<aultsfile>file
-dev<ice>X11:XWIN:OPEN<GL>:GL:XGL:SBX:STAR<BASE>
-doc<umentation>
-geom<entry>WIDTHXHEIGHT+X+Y
-help
-id name
-inp<ut file>file<implies batch run and no gui>
-init<file>file<a journal file to run at startup of gui mode>
-new:-old
-proe proe_command
-res<tore journal>file<implies batch run and no gui>


could you please tell me what happened ,

should i reinstall gambit & fluent

but my fluent is still functional


please do mail me at subashkumar47@gmail.com

thanks in advance.
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Old   October 19, 2011, 01:14
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Sounds you had earlier a crash with a session called default_id.
Look for *.lok file and delete it.
Then restart
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