pgflag hangs

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pgflag hangs

Postby gal16b » Mon Jun 15, 2020 2:56 pm

I thought I would report this. I am churning through the ATCA GLASS data and have come across a little problematic scenario. If all data in a visibility file is already flagged before pgflag is executed, it seems that pgflag will hang. The process will run continue to run without and exit. My jobs on a compute cluster get timed out at 6 hours, and when I checked 5 hours were spent by this one pgflag task getting caught somewhere. In the last semester of observing where we were filling in missing hour-angle coverage I am finding this problem happening a more than I would like.

This happens in both the user interactive and automated flagging modes. It happens across different pgflag settings (stokes, flarpar etc).

I can work around this with a check using uvfstats to ensure that there is at least some unflagged data before hand. I would think though that the preferred behavior would be for pgflag to exit without getting caught in this loop.
gal16b
 
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Re: pgflag hangs

Postby Mark.Wieringa » Wed Jun 17, 2020 5:17 pm

Hi Tim,

thanks for reporting this.
I must admit I don't quite understand what the code is trying to do here, but I slapped on a patch and now it exits when there is no unflagged data left.
Let me know if you notice any other issues.
The update should go out tomorrow night.

Cheers,

Mark
Mark.Wieringa
ATCA Expert
 
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