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[Opal] optimizer sometime gets stuck


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  • From: Philippe Piot <philippe.piot AT gmail.com>
  • To: opal <opal AT lists.psi.ch>
  • Subject: [Opal] optimizer sometime gets stuck
  • Date: Thu, 27 May 2021 06:52:02 -0500
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Dear All,
   When running optimization in OPAL it sometimes happens that the optimizer gets stuck: the job is still active (shows as running) in the cluster queue, but none of the files (opt/pilot.trace.0) are updated anymore. It also usually happens before any of the .json outputs are written. Doing a cat of the stdout (which is not more updated) gives the info below. Could somebody points to other diagnostics I could use to troubleshoot this issue? My problem is quite simple (I have two objective emit_x and emit_y and one "derived" objective sqrt(emit_x*emit_y) and four constraints. Thank you for any suggestions. All the best,  -- Philippe. 


--- tail of stdout
Ippl> CommMPI: Initialization complete.
Ippl> CommMPI: Parent process waiting for children ...
Ippl> CommMPI: Initialization complete.
Ippl> CommMPI: Parent process waiting for children ...
Ippl> CommMPI: Initialization complete.
Ippl> CommMPI: Parent process waiting for children ...
Ippl> CommMPI: Initialization complete.
Ippl> CommMPI: Parent process waiting for children ...
Ippl> CommMPI: Initialization complete.

    



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