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World Community Grid Forums
Category: Support
Forum: BOINC Agent Support
Thread: Leave applications in memory while preempted? |
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Thread Status: Active Total posts in this thread: 19
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
What is that supposed to do? I Googled around, didn't find much... Except that it's recommended for multiple projects? I'm only running WCG. Can anyone go more in depth? I thought it was a "permanent" checkpointer but doesn't seem so.
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
Does exactly what it says on the tin.
:-) |
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
The tin? I'm not sure what "preempts" mean. Does that mean that it's "permanently" checkpointing?
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
No, it's when you are running more than one project at once, and BOINC stops working on one project to work on another.
Keeping the application in memory avoids losing any progress if the application doesn't checkpoint very often. The downside is it can use a lot of memory. You can ignore it completely.... |
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retsof
Former Community Advisor USA Joined: Jul 31, 2005 Post Count: 6824 Status: Offline Project Badges: 
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If projects are swapped out of memory, I have had a few projects get confused and mess up on their calculations. They get aborted. WCG is not one of these. it works fine. I will try to leave the projects in memory to see whether the problem happens again.
----------------------------------------If memory is scarce, swapping it out will free up some space if you run multiple projects.
SUPPORT ADVISOR
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Sekerob
Ace Cruncher Joined: Jul 24, 2005 Post Count: 20043 Status: Offline |
What is that supposed to do? I Googled around, didn't find much... Except that it's recommended for multiple projects? I'm only running WCG. Can anyone go more in depth? I thought it was a "permanent" checkpointer but doesn't seem so. It still does what's printed on that tin, but has become a little superfluous as the project switching (preempting) by the new rules of BOINC 5.8.15 does not take place until a first or next checkpoint has been reached. This to maximize progress and minimize lost CPU time. Visit the new BOINC FAQ (even in Dutch available), the Unofficial BOINC Wiki , the WCG Wiki (in several languages) and other info sources like Start Here and Help . Those answer most questions you have and you have many so far..... old inter-nettiquete adage is: RTFM (Read the Friendly Manuals ;>) and the fora of course. cheers from Italy where I'm re-reading 'Baudolino' presently (Umberto Eco)
WCG
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
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KAMasud
Cruncher Joined: Nov 18, 2006 Post Count: 20 Status: Offline Project Badges: 
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 does not make much of a difference  even with two GB RAM i do not leave it in memory  reason being unexpected power failures in this part of the world.Regards Masud. What is that supposed to do? I Googled around, didn't find much... Except that it's recommended for multiple projects? I'm only running WCG. Can anyone go more in depth? I thought it was a "permanent" checkpointer but doesn't seem so. |
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Sekerob
Ace Cruncher Joined: Jul 24, 2005 Post Count: 20043 Status: Offline |
The tin? I'm not sure what "preempts" mean. Does that mean that it's "permanently" checkpointing? I think some countries in particular political phases put diplomacy aside and adopted the "preemptive" strike doctrine.  The "Leave In Memory" option as earlier eluded has lost much of its function since the project switching is now done at checkpoints saved. BUT, if you manually suspend a job and the LIM is not on, the job will unload and you will surely have lost the time since the last checkpoint save. Thus, for those on emergency schedules / micromanage schemes, use the function and get ahold of a cheap UPS. Mine supports 20 minutes without mains and will start to hibernate the boxes after 5 minutes. When power returns, it auto-resumes and crunches again, whilst safely behind a password screen (whilst shuteye or away).
WCG
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
So LIM doesn't work if I shutdown? Still, I understand it to be "permanently" checkpointing at least when leaving BOINC open then. And what in the world is a tin?
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