Checkpoint interval

Message boards : Number crunching : Checkpoint interval

Author	Message
jjwhalen Send message Joined: 23 Nov 09 Posts: 29 Credit: 12,013,749 RAC: 12,415 Level Scientific publications	Message 18386 - Posted: 23 Aug 2010 \| 0:49:01 UTC Last modified: 23 Aug 2010 \| 1:14:09 UTC
	I have my GPU host set to "Write to disk at most every 300 seconds". Monitoring ACEMD2 6.11 with BoincTasks (which has a checkpoint counter/timer) I find that it is checkpointing approximately every 50 seconds, +/- the BT refresh rate of 3 seconds. This is on an Intel Core2 Quad Q9400/GTX 465SC machine running BOINC 6.11.4 under WinVista SP2. Are GPU tasks exempt from the core client's write to disk setting? Other GPU projects I crunch either don't checkpoint at all (i.e., DNETC) or are close to the 5 minute interval I have set. ____________
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Toni Volunteer moderator Project administrator Project developer Project scientist Send message Joined: 9 Dec 08 Posts: 505 Credit: 4,020,487 RAC: 0 Level Scientific publications	Message 18388 - Posted: 23 Aug 2010 \| 10:32:17 UTC - in response to Message 18386. Last modified: 23 Aug 2010 \| 10:32:42 UTC
	I suspect that setting applies to saving the boinc client state only, not to the applications (which have their own checkpointing mechanism)
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Saenger Send message Joined: 20 Jul 08 Posts: 134 Credit: 3,732,401 RAC: 9,763 Level Scientific publications	Message 18390 - Posted: 23 Aug 2010 \| 14:18:30 UTC
	Officially checkpointing of the scientific apps is the one thing this preference setting is meant for. Look in the unofficial Wiki ____________ Gruesse vom Saenger For questions about Boinc look in the BOINC-Wiki
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jjwhalen Send message Joined: 23 Nov 09 Posts: 29 Credit: 12,013,749 RAC: 12,415 Level Scientific publications	Message 18391 - Posted: 24 Aug 2010 \| 13:34:29 UTC - in response to Message 18390. Last modified: 24 Aug 2010 \| 13:51:41 UTC
	Officially checkpointing of the scientific apps is the one thing this preference setting is meant for. Look in the unofficial Wiki Exactly, TG. And with this in mind, I reiterate my question ;) (BTW, "unofficial" WIKI doesn't = "uninformed.") Some users, myself included, have found it useful to limit the amount of checkpointing certain application do, because this can improve their performance at the risk of losing more data in the event of a crash or deliberate restart. This is why Fred Melgert added the checkpoint counter/timer to his BoincTasks utility. ____________
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GDF Volunteer moderator Project administrator Project developer Project scientist Send message Joined: 14 Mar 07 Posts: 1811 Credit: 629,344 RAC: 0 Level Scientific publications	Message 18392 - Posted: 24 Aug 2010 \| 14:57:56 UTC - in response to Message 18391.
	Our application does not take the value given by the BOINC client to checkpoint because for us it must be a multiple of the output file frequency. In this way all works nice when you stop and restart the application. gdf
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jjwhalen Send message Joined: 23 Nov 09 Posts: 29 Credit: 12,013,749 RAC: 12,415 Level Scientific publications	Message 18393 - Posted: 25 Aug 2010 \| 2:02:13 UTC - in response to Message 18392.
	Our application does not take the value given by the BOINC client to checkpoint because for us it must be a multiple of the output file frequency. In this way all works nice when you stop and restart the application. gdf OK gdf, thanks for the clarification :) ____________
	ID: 18393 \| Rating: 0 \| rate: / Reply Quote

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Message boards : Number crunching : Checkpoint interval