File locked Error

[Neeraj]

Hi all,

I am trying to run an optimization in Pelegant. I use the command,

Code: Select all

mpiexec -n 6 Pelegant optimizeQ.ele

It works fine as long as my method is 'simplex'. If I change it to anything else, I get an error,

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Error:
Unable to access file optimizedQ.bun--file is locked (SDDS_InitializeOutput)
Error:
Unable to access file optimizedQ.bun--file is locked (SDDS_InitializeOutput)
Error:
Unable to access file optimizedQ.bun--file is locked (SDDS_InitializeOutput)
Error:
Unable to access file optimizedQ.bun--file is locked (SDDS_InitializeOutput)
Error:
Unable to access file optimizedQ.bun--file is locked (SDDS_InitializeOutput)

Where OptimizedQ.bun is the bunch file written by my elegant code. I think all the parallel processes try to access the same bunch file and clashes. Is there any other changes I need to make in existing namelists other than in &parallel_optimization_setup for parallel optimization to work?

Thanks
Neeraj

[michael_borland]

Neeraj,

Can you post your .ele file?

--Michael

[Neeraj]

Please find it attached.

[michael_borland]

Neeraj,

I'm not sure why that file-lock problem occurs, but you can solve it by removing the "bunch = %s.bun" statement from the &bunched_beam command; you don't really need it. Also, set one_random_bunch=1 to avoid confusing the optimizer.

Since you are doing tracking-based optimization, there's no benefit to using parallel_optimization_setup. You are better off using optimization_setup, so that elegant will track in parallel and optimize at the serial level.

--Michael