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FLUENT 6.3.26 Parallel Job

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Old   September 10, 2007, 18:01
Default FLUENT 6.3.26 Parallel Job
  #1
Lourival
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Hy every one I'm using FLUENT 6.3.26 on parallel computations and one interesting thing is happening.

When I load it on a CPU dual core I can see that one of the CPU is full and the other is empty. The same happens when I load it on two different CPUs.

On the Windows Task Manager I can see a process called fl_mpi6326.exe with 50% of CPU (dual core). As you can see I'm using the MPICH2 as the MPI.

Does some one know what is happening? And Why it is happening??

Best regards

Lourival
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Old   September 10, 2007, 18:34
Default Re: FLUENT 6.3.26 Parallel Job
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Joe
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Set up your hosts file correctly.
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Old   September 10, 2007, 21:33
Default Re: FLUENT 6.3.26 Parallel Job
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Nantaratn Kananai
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If you have 2 computers and first one has 2 cores. The host file should be

computer1 computer1 computer2

Then, fluent will run on computer1 with 2 cores.

: ) nantaratn@yahoo.com
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Old   September 11, 2007, 06:55
Default Re: FLUENT 6.3.26 Parallel Job
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Lourival
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The host file is set up OK: computer1 computer1 computer2

Maybe I wasn't clear, the process fl_mpi6326.exe is running with no Calculus. I only read the case and file and the process is already running.

Hugs

Lourival
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Old   September 11, 2007, 22:15
Default Re: FLUENT 6.3.26 Parallel Job
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Nantaratn Kananai
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if you use fluent journal, in the end of your journal should have a command to exit FLUENT. Then, the fl_mpi6326.exe will closed automatically.

(ti-menu-load-string (format #f "exit " ))

cheers, Nant.
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Old   September 12, 2007, 10:18
Default Re: FLUENT 6.3.26 Parallel Job
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Lourival
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Dear Nant,

Thanks for your advanced advice.

Let me describe in some more details what is happening:

When I run on CMD the following command:

fluent 3d

There is a processes whit a image name fl6326s.exe whit no CPU usage

Probably this is the SERIAL solver.

A different thing happens when I run:

fluent 3d -t2

There is four new process:

fl_mpi6326.exe fl_mpi6326.exe fl6326.exe cx373.exe

Probably the fl_mpi6326.exe is the processes that is running on each CPU and the fl6326.exe is the HOST. I don't guess what is the meaning of cx373.exe, but this is not the question.

The question here is: Why one of the fl_mpi6326.exe is running full? CPU = 50. Note that I didn't load any case. I just run the command, fluent 3d -t2, on the CMD.

Best regards

Lourival
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Old   September 13, 2007, 05:25
Default Re: FLUENT 6.3.26 Parallel Job
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jack
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i actually face same things, when i run all the processor of my machine in parallel, before i open any cases , all my CPU are in full load.
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Old   September 13, 2007, 08:23
Default Re: FLUENT 6.3.26 Parallel Job
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mvee
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hi i have just started using parallel processing. i thought that that is during only start up procedure. during iterate you will not find this problem. that is one thing and another that have u tried with load balancing?.

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