Are applications even aware when they've been hit by a SIGSTP? This idea of a license being released under these circumstances just seems very unlikely.
On 10/15/19 1:57 PM, Brian Andrus wrote: > It seems that there are some details that would need addressed. > > A suspend signal is nothing more than sending a SIGSTP (like hitting > ctrl-s), so the application is still in memory awaiting SIGCONT > > So what should happen when it continues and there are no more licenses? > So the proper place for what you are looking for is in the application > itself. If it is given a SIGSTP, it could release the licenses and then > check them out again when SIGCONT is received. > > If you are able to tell your app to release/request a license > externally, you may want to have a wrapper to do the signal handling > until they have it as part of their app. > > Brian Andrus > > > On 10/14/2019 4:40 AM, Oytun Peksel wrote: >> >> It is quite weird if slurm has no mechanism as described. I have been >> digging more into it and someone suggested a workaround using mail >> notifications. You use a script instead of the mail application and >> catch the event then use use sacct to see what is happening. >> >> Two problems with this: >> >> ·There is no mail sent with suspended preemption >> >> ·If you use requeue instead there will be a mail event and you can >> catch it. Sacct will flag it as “preempted” so you know it is >> requeued. But then it would change it pending. So you really need to >> be quick to catch it. Also there is no distinctive flag for resuming. >> >> Anyone has any other method to execute scripts during preemption? >> >> >> >> *Oytun Peksel* >> >> oytun.pek...@semcon.com <mailto:oytun.pek...@semcon.com> >> >> >> >> >> +46739205917 >> >> >> >> >> *From:*slurm-users <slurm-users-boun...@lists.schedmd.com> *On Behalf >> Of *Oytun Peksel >> *Sent:* den 11 oktober 2019 09:10 >> *To:* slurm-users@lists.schedmd.com >> *Subject:* [slurm-users] Execute scripts on suspend and cancel >> >> Hi, >> >> I was wondering is there an option in Slurm to execute custom scripts >> before Suspend signal. What I need to do is to tell an application to >> release it’s licenses before sending the suspend signal during >> preemption. I think went through all the documentation but could not >> find a mechanism like this. >> >> BR >> >> /Oytun >> >> >> >> /When you communicate with us or otherwise interact with Semcon, we >> will process personal data that you provide to us or we collect about >> you, please read more in our Privacy Policy >> <https://semcon.com/data-privacy-policy/>./ >>