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Problem with slurm backend when calling scancel #45

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statquant opened this issue Apr 26, 2019 · 2 comments
Open

Problem with slurm backend when calling scancel #45

statquant opened this issue Apr 26, 2019 · 2 comments

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@statquant
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Hello,
When I call scancel to cancel all tasks submitted to a slurm cluster by future.batchtools then hit CTRL-C to get the terminal back, R displays an error per task and is painfully slow to come back.
@HenrikBengtsson
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How many jobs are we talking about? Basically, is it "painfully slow to come back" for a single job or for 100's of jobs?

What's probably going on is that futures are being garbage collected by R and we cleaned up they reach out to Slurm to query about each job's status. Doing lots of these queries might take some time. At least that's my guess based on the limited info I have at hand.

@statquant
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Hello, I was referring to 1000 jobs.
Interrupt with Ctrl-C becomes useless I would say I get an error message per second.
I have little information as I am forced to kill -9 the master R process.
I can probably replicate this this easily, is there any information you'd like me to report?

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@HenrikBengtsson @statquant