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Re: [Opal] opal sampler hangs

Chronological Thread 
  • From: "Snuverink Jochem (PSI)" <jochem.snuverink AT>
  • To: opal <opal AT>, "piot AT" <piot AT>
  • Subject: Re: [Opal] opal sampler hangs
  • Date: Tue, 14 Jul 2020 08:19:10 +0000
  • Accept-language: en-US, de-CH

Dear Philippe,

Thanks for the example and reporting.

This is likely related to what Finn O'Shea reported as well with the optimizer (the sampler and the optimizer are very related in terms of code).  If that is the case then it might not happen all the time and you can perhaps try to rerun.

We have opened an issue and will continue following up there.

Best wishes,


From: opal-request AT <opal-request AT> on behalf of Philippe Piot <piot AT>
Sent: Friday, July 10, 2020 2:46:55 PM
To: opal
Subject: [Opal] opal sampler hangs
Dear All,
  I recently installed opal on a fedora32 laptop and the sampler feature does not work anymore. It starts fine but then hangs. The same example used not to hang in the previous versions of this OS. 
  I am attaching the stdout output and my input file (.tmpl, .in, and .data) in case somebody see an obvious mistake. The pilotTrace file clearly states the jobs (0 to 10) are all finished consistent with my scanning over 11 points. I run opal via the command
  mpirun --mca btl ^uct /home/piot/Simulations/OPAL/opal/build/src/opal
  The input file works fine alone (without attempting to do any scan). 

   Thank you for any suggestions! All the best, -- Philippe. 

Philippe Piot,
Northern Illinois University, Dept of Physics and
Northern Illinois Center for Accelerator & Detector Development
DeKalb, IL 60115, USA
Tel: 815 753 6473, Web:

Argonne National Laboratory, Advanced Photon Source
Accelerator System Division
Lemont, IL 60439, USA
Tel: 630 252 2415, Web: 

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