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Old   September 6, 2008, 06:37
Default dual core parallelization
  #1
cesco
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Hi people, I have a dual core processor, but fluent's analisys only run on one of the two cores. how do i do to make it works on parallel?
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Old   September 6, 2008, 08:50
Default Re: dual core parallelization
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Mike
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Yes you have to launch fluent by dos(if you have windows) with the command "fluent -t2 &".

Bye
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Old   September 6, 2008, 12:06
Default Re: dual core parallelization
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cesco
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hi, thanks for the advice but let me understand better... 1)from dos I have to arrive in the directory of fluent and write: fluent -t2 & 2)why do you say "if" i have windows? I have a macbook pro with windows installed only to run fluent. Don't you want to teel me that I can run fluent also with mac, do you?
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Old   September 6, 2008, 12:17
Default Re: dual core parallelization
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Mike
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Yes, you have to arrive in the directory where you have the fluent executable file (typically Fluent.Inc\ntbin\ntx86) and type "fluent -t(Number of Cores) &" (i.e. fluent -t2 &). I don't know if you can run fluent on mac, but I run it on linux and it's better.

Good Luck with parallelization!!!
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Old   September 6, 2008, 13:39
Default Re: dual core parallelization
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cesco
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sorry mike, but when I launch fluent un the way you explained, it cannot read either the cas file, either the mesh file.

it gives me the following several time:

version> C:\Documents and Settings\cescosky\My Documents\universita esi francesco umerico\0018\rotanti\SM ondo totale\mesh stretta ondostretto2proc.cas: 2ddp (2d double precision) #f

and I cannot do anything...check the grid, initialize, solve...anything.

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Old   September 6, 2008, 22:05
Default Re: dual core parallelization
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Mike
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I don't know why....but if you want you can send me cas and dat and I will try.

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Old   September 7, 2008, 03:03
Default Re: dual core parallelization
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doki
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try a shorter root for the case and data files. i.e. save them e.g. in e:\????.cas etc. Fluent sometimes has problems with long adresses for the files. another thing is, if your case and data are for dp mode, run the fluent in the same mode. good luck
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Old   September 7, 2008, 06:31
Default Re: dual core parallelization
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cesco
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ok. the problem was to set the correct operating mode, menu\file\run..\2ddp. Thanks for the help but now it works on the two cores using half power of both. Instead of using 100% of one core it uses 50% of both. the result is the same. How can I do to make it works with the full power?
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Old   September 16, 2008, 10:52
Default Re: dual core parallelization
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Manfred
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Ci ho provato anche io, e l'unico modo che ho trovato per fare andare tutti i core al 100% stato far partire diverse istanze di fluent e far risolvere ad ognuna un caso diverso.

La procedura che ti hanno suggerito va bene se hai 2 PROCESSORI, ma per 2 CORE non funziona, credo che sia un problema di Windows e di come gestisce i thread sui multicore.

Non sono a conoscenza di nessun modo per usare ogni core in full load.

In bocca al lupo
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