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World Community Grid Forums
Category: Active Research
Forum: OpenPandemics - COVID-19 Project
Thread: OPN1 WU memory leaks? |
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Thread Status: Active Total posts in this thread: 41
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biini
Senior Cruncher Finland Joined: Jan 25, 2007 Post Count: 334 Status: Offline Project Badges: 
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Is there any estimates when the problem would be fixed? It seems that without CPU units, my intel laptops cannot download GPU WUs either
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Mike.Gibson
Ace Cruncher England Joined: Aug 23, 2007 Post Count: 12363 Status: Offline Project Badges: 
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biini
Are they doing any other projects (ARP or MCM)? Then you should be able to download OPNG. If you don't really want to do them, just set your profile to a maximum of 1 MCM. That is much quicker than ARP and so would request new work more often. Mike |
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Mike.Gibson
Ace Cruncher England Joined: Aug 23, 2007 Post Count: 12363 Status: Offline Project Badges:
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I now have 3 units from batches 0063600, 0063610 & 0063616. 2 of them have unit numbers in the thousands.
----------------------------------------These are resends for no reply from before problems started. Mike [Edit 1 times, last edit by Mike.Gibson at Oct 6, 2021 11:36:11 PM] |
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KerSamson
Master Cruncher Switzerland Joined: Jan 29, 2007 Post Count: 1672 Status: Offline Project Badges: 
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The current OPN1 WU size makes more or less impossible for Raspberry Pi (RPi) with 1GB RAM to concurrently run more than 2 WUs without starting to swap.
----------------------------------------Cheers, Yves ---------------------------------------- [Edit 1 times, last edit by KerSamson at Oct 12, 2021 12:36:25 PM] |
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Crystal Pellet
Veteran Cruncher Joined: May 21, 2008 Post Count: 1320 Status: Offline Project Badges: 
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I am able to run 4 concurrently (without clearing memory by suspend during the run)
on two 2GB RAM laptops with Win10, just because the tasks are running in cascade: Task -------------- Progress - Virtual - Memory |
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KerSamson
Master Cruncher Switzerland Joined: Jan 29, 2007 Post Count: 1672 Status: Offline Project Badges:
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because the tasks are running in cascade Since the tasks do not have always the same duration, "cascading" is very close to lottery. It will run well as long as no task will not be significantly shorter or longer. As mentioned, on Raspberry Pi with only 1 GB RAM (what was sufficient since the start of OPN1 project) it is not really recommended to concurrently compute more than 2 WUs (instead of 4). Cheers, Yves |
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wcgmac
Cruncher Joined: Jul 16, 2016 Post Count: 15 Status: Offline Project Badges: 
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I have several headless RaspberryPi running OpenPandemics-Covid19 and recently noticed that all are having problems completing the work. One has an 8GB card that is now completely filled. Two others show that two processes ("rsyslogd" and "systemd-j+") that are taking 20-40 percent of CPU use, significantly slowing the computers' operation.
Are these problems due to the recently reported "OPN1 WU memory leak"? Does the memory leak still exist and, if so, what can I do to make these Raspberry Pi's successfully run OpenPandemics again? Previously, all were working fine with the OPN1 project. Thank you for help. |
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Crystal Pellet
Veteran Cruncher Joined: May 21, 2008 Post Count: 1320 Status: Offline Project Badges:
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Are these problems due to the recently reported "OPN1 WU memory leak"? Does the memory leak still exist ... Yes and yes. The problem is reduced by packing only 20 jobs within one task instead of >60 up to 130....and, if so, what can I do to make these Raspberry Pi's successfully run OpenPandemics again? Previously, all were working fine with the OPN1 project The only way to work around is to free memory now and then by suspending tasks or suspend the WCG-project for a short moment and resume.Untick in BOINC's preferences "Leave non-GPU tasks in memory while suspended". With boinccmd you could create a script to suspend the project for 10 or 20 seconds and resume thereafter every hour or so [Edit 3 times, last edit by Crystal Pellet at Oct 12, 2021 5:55:07 PM] |
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wcgmac
Cruncher Joined: Jul 16, 2016 Post Count: 15 Status: Offline Project Badges:
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Thank you, Crystal Pellet, for the suggestion to untick non-GPU tasks in memory. I've made that change to all the RPi's.
What about changing the Preferences for "Page/swap file use" to something less than the default 75 percent? Would that help in this case? |
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Crystal Pellet
Veteran Cruncher Joined: May 21, 2008 Post Count: 1320 Status: Offline Project Badges:
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What about changing the Preferences for "Page/swap file use" to something less than the default 75 percent? Would that help in this case? Less? I've set it to 90% on my crunchers. |
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