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How to restart a simulation in MPI mode

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Old   April 24, 2013, 16:47
Default How to restart a simulation in MPI mode
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hamed
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Hi everybody

I have done a simulation in MPI mode with AVL Fire 2011. now I want to restart the simulation from a specific time step. but like single mode, just one processor runs the simulation. how can I fix it?

best regards

Hamed
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Old   April 24, 2013, 22:41
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Myunghwan Kim
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Hi hamed,

If I understood correctly, you already calculated using MPI mode.
And then, you want to restart from a specific time step using single(serial) mode.
Right?

Basically, there is no special way.

I hope you are familiar to use the shell.

the command is

cfdwm_solver -solver_vers=v2011 -case=Case -restart=Case.rs0

You have to know which restart file(CaseName.rs0 or CaseName.rs1) or backup file(CaseName.bc_00####) is for the specific time.
Please see the fla file.

If you have some problems to restart, please describe more detail.
- error message
- your application(moving mesh? combustion? aftertreatment? porosity?...)
- others
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Old   April 25, 2013, 04:56
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hamed
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thanks for response kimmhw

I already calculated my simulation using MPI mode and I want to restart it using MPI again. but after choosing MPI mode and 8 number of processors, just one processor is working and the rest of processors work with 0 % CPU as shown in task manager.
I do not know how to use all processors for restarting.
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Old   April 25, 2013, 21:40
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Quote:
Originally Posted by hamedhamed View Post
thanks for response kimmhw

I already calculated my simulation using MPI mode and I want to restart it using MPI again. but after choosing MPI mode and 8 number of processors, just one processor is working and the rest of processors work with 0 % CPU as shown in task manager.
I do not know how to use all processors for restarting.
Hello hamed,

Frankly, it is not easy to understand your problem exactly without your model/log message.

But please try to do as below.

1) if you start the calculation using GUI
there is one advanced option in job setup menu.
Advanced Setting - check "disable file locking "

2) if you start the calculation on shell
Add one argument (-no_file_locking).
cfdwm_solver -solver_version=v2011 -case=CaseName -mpi -cpu=8 -restart=CaseName.rs0 -no_file_locking
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Old   April 26, 2013, 13:27
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hamed
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Thanks kimmhy

"disable file locking" was helpful.
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