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World Community Grid Forums
Category: Completed Research
Forum: AfricanClimate@Home
Thread: AC@H with 512Mb machine |
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Thread Status: Active Total posts in this thread: 8
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retsof
Former Community Advisor USA Joined: Jul 31, 2005 Post Count: 6824 Status: Offline Project Badges: 
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I happened to be sitting here when the small computer got 5 AC@H that were released for download this morning.
----------------------------------------Page fault delta for AC@H on two systems ranges all over the place from 0 to 12,000/second. That's not unreasonable, compared to the HCC which were giving a constant 45,000/second. (The new beta should fix that one.) One phenomenon I'm noticing is that the 512Mb machine is very sluggish when running AC@H. That just means that there's not much memory left for anything else. They are completing correctly and run smoothly on this AMD64 2.0GHz OC to 2.4GHz. One just finished and a new one is starting. DDD-T doesn't have a large impact there. It's mainly a crunch-only machine. I'll surf elsewhere on the 3Gb or 1.5Gb AMD64 2.4GHz stock speed computers until they are done.
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----------------------------------------Work+GPU i7 8700 12threads School i7 4770 8threads Default+GPU Ryzen 7 3700X 16threads Ryzen 7 3800X 16 threads Ryzen 9 3900X 24threads Home i7 3540M 4threads50% [Edit 6 times, last edit by retsof at Feb 20, 2008 5:02:00 PM] |
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
One phenomenon I'm noticing is that the 512Mb machine is very sluggish when running AC@H. That just means that there's not much memory left for anything else. More specifically, under Linux (and I would guess Windows too, unless you limit your disk cache size) AC@H writes such massive files that it causes the operating system to cache hundreds of MB in RAM, causing programs (including AC@H itself) to have to swap. I wonder if AC@H really needs 2 identical huge files? (output.ckp.nc and wcg_checkpoint_00.ckp) Some of the time, output.nc is also identical to the other 2, making 3 identical copies of a ~150MB file. If it only wrote out one of them, the OS would do much less disk caching and system performance would be better. |
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retsof
Former Community Advisor USA Joined: Jul 31, 2005 Post Count: 6824 Status: Offline Project Badges:
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It does do a broadband test to see whether you can handle a 10 Mb download quickly.
----------------------------------------There are only a bit more than 800 workunits per batch, so we'll make do. We're well into the first phase, with batch #22.
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----------------------------------------Work+GPU i7 8700 12threads School i7 4770 8threads Default+GPU Ryzen 7 3700X 16threads Ryzen 7 3800X 16 threads Ryzen 9 3900X 24threads Home i7 3540M 4threads50% [Edit 2 times, last edit by retsof at Feb 21, 2008 10:38:56 PM] |
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Sekerob
Ace Cruncher Joined: Jul 24, 2005 Post Count: 20043 Status: Offline |
Actually, 80% completion is imminent with ACH1_22 of 27
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WCG
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retsof
Former Community Advisor USA Joined: Jul 31, 2005 Post Count: 6824 Status: Offline Project Badges:
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Actually, 80% completion is imminent with ACH1_22 of 27 If you see #28, you'll know that they are going to 52, unless something changed.http://www.worldcommunitygrid.org/forums/wcg/viewthread?thread=18388#150719 As you know we are currently running through 52 weeks of simulations through 82 different parameter variations.
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----------------------------------------Work+GPU i7 8700 12threads School i7 4770 8threads Default+GPU Ryzen 7 3700X 16threads Ryzen 7 3800X 16 threads Ryzen 9 3900X 24threads Home i7 3540M 4threads50% [Edit 1 times, last edit by retsof at Feb 22, 2008 2:46:28 AM] |
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
Each work unit covers 2 weeks. 27 work units cover a year plus several days.
Lawrence |
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Sekerob
Ace Cruncher Joined: Jul 24, 2005 Post Count: 20043 Status: Offline |
Bits and Bops LH is close-r me thinketh
----------------------------------------Think the simulations cover 2003 when looking in the result log and last I saw it said 2003/9/10 and the one falling in yesterday night and just completing said <core_client_version>5.10.42</core_client_version> <![CDATA[ <stderr_txt> Failed to get VersionInfo size: 2 World Community Grid ACAH (projects/www.worldcommunitygrid.org/wcg_acah_wrf_5.14_windows_intelx86) version INFO: No state to restore from. Starting from beginning Start_year/Start_Month/Start_Day::Start_Hour:Start_Minute:Start_Second Restart2003/10/8::0:0:0 1 </stderr_txt> ]]> As for the files, at least there is a rename of a previous checkpoint before the writing of a new checkpoint following the timestamps. Guess it's fair as system crashing during a checkpoint write leaves no recovery point to go back to. There are approx 54 of these events (coincidence as 27x2 is also 54). And as i just compared using Process Explorer 'it' on a Vista/Q6600 v a XP/P4 (with 1.5gRam) there could be some gained by looking at PF and PF Delta before moving from small to large scale predicting for Africa. Vista had 60 million versus 6.5 billion page faults for XP. Vista showed 6 minutes kernel time. Did not record the amount on XP. Anyone volunteering? Just know that on P4 the credits have consistently been cut by about 33% (similar to old HCC 5.15)! Today is pasta day.... going for the linguini .... and lots of wise guys here ;-)
WCG
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retsof
Former Community Advisor USA Joined: Jul 31, 2005 Post Count: 6824 Status: Offline Project Badges:
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Now, with one more change to the 90000 hectares to make the units compatible...
----------------------------------------Each 2 week period covers 82 adjacent 'areas' of 30x30km in SA. 82 areas of 149.129086 x 149.129086 furlongs per fortnight.
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----------------------------------------Work+GPU i7 8700 12threads School i7 4770 8threads Default+GPU Ryzen 7 3700X 16threads Ryzen 7 3800X 16 threads Ryzen 9 3900X 24threads Home i7 3540M 4threads50% [Edit 2 times, last edit by retsof at Feb 22, 2008 2:06:51 PM] |
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