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-   -   dual core parallelization (http://www.cfd-online.com/Forums/fluent/49197-dual-core-parallelization.html)

cesco September 6, 2008 05:37

dual core parallelization
 
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?

Mike September 6, 2008 07:50

Re: dual core parallelization
 
Yes you have to launch fluent by dos(if you have windows) with the command "fluent -t2 &".

Bye

cesco September 6, 2008 11:06

Re: dual core parallelization
 
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?

Mike September 6, 2008 11:17

Re: dual core parallelization
 
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!!!

cesco September 6, 2008 12:39

Re: dual core parallelization
 
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.


Mike September 6, 2008 21:05

Re: dual core parallelization
 
I don't know why....but if you want you can send me cas and dat and I will try.


doki September 7, 2008 02:03

Re: dual core parallelization
 
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

cesco September 7, 2008 05:31

Re: dual core parallelization
 
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?

Manfred September 16, 2008 09:52

Re: dual core parallelization
 
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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