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World Community Grid Forums
Category: Completed Research
Forum: The Clean Energy Project - Phase 2 Forum
Thread: Questions about participation drive for CEP2 |
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Thread Status: Active Total posts in this thread: 152
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oliverstirling
Advanced Cruncher United Kingdom Joined: May 7, 2007 Post Count: 107 Status: Offline Project Badges: 
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I suspect I know the answer to this one already (no...or variants on that theme) but I was looking to start running on CEP2 on my rigs at home, which sadly aren't on JANET so no super-fast up/downloads
 Currently I have a 1MB line (a long way from the exchange and my area's been missed off the fibre rollout by BT and Virgin) so I don't get any work CEP2 units from the servers. I'm not averse to my broadband line being tied up for several hours as it doesn't get much use (primarily as it's so rubbish) so would it be possible to have an opt-in option for those wishing to participate who have sub-standard internet connection speeds? |
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Randzo
Senior Cruncher Slovakia Joined: Jan 10, 2008 Post Count: 339 Status: Offline Project Badges: 
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Hello
go to My Grid -> Device manager-> Device profiles-> Default->Custom profile and edit Project Specific Settings "Number of workunits per host for The Clean Energy Project - Phase 2? The Clean Energy Project - Phase 2 is limited on how many workunits a computer can have downloaded at a time and what minimum bandwidth the computer must have in order to receive any workunits. Changing this value from the default of 1 will override both of these restrictions." So this should help you. |
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oliverstirling
Advanced Cruncher United Kingdom Joined: May 7, 2007 Post Count: 107 Status: Offline Project Badges:
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what minimum bandwidth the computer must have in order to receive any workunits. Changing this value from the default of 1 will override both of these restrictions Thanks, I missed that (rather obviously) |
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Wiyosaya
Cruncher Joined: Nov 22, 2009 Post Count: 9 Status: Offline Project Badges:
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I would certainly love to rejoin this project, however, with the checkpointing issue and the fact that since I shut my machines down, tasks restart from 0 on all my machines, I cannot consider CEP2 a good match for the way I run my machines. If there were another scheme for handling the checkpointing such that WUs did not restart from 0 each time I shut down my machines, I would be happy to run the project again.
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anhhai
Veteran Cruncher Joined: Mar 22, 2005 Post Count: 839 Status: Offline Project Badges: 
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I would certainly love to rejoin this project, however, with the checkpointing issue and the fact that since I shut my machines down, tasks restart from 0 on all my machines, I cannot consider CEP2 a good match for the way I run my machines. If there were another scheme for handling the checkpointing such that WUs did not restart from 0 each time I shut down my machines, I would be happy to run the project again. Wiyosava, it doesn't restart from 0. The WU restart from the last checkpoint. However, some checkpoints are hours apart  |
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
As there is no save/checkpoint on exit and the first checkpoint could be an hour on a good system (many hours on an entry level system), this project is not for normal computer use, hence it's opt-in only. I'm back running one CEP2 task at a time on my quad. Might up that to 2 tasks in a day or two, when I stop running HFCC tasks.
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
Yes, it is correct that the CEP2 checkpoints are relatively far apart. That means that slow machines that are regularly shut down or interrupted without LAIM will loose a good chunk of time in the restarts and these may be better off running one of the other great WCG projects.
Best wishes Your Harvard CEP team |
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Rickjb
Veteran Cruncher Australia Joined: Sep 17, 2006 Post Count: 666 Status: Offline Project Badges: 
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@Wiyosaya: If your computer & operating system support it, you may be able to avoid losing crunching time by shutting down the computer using "Hibernate" instead of full Shutdown. To hibernate, the o/s suspends all processing then saves the state of the whole machine, including an image of the entire RAM contents, to a file on the disc before cutting power. When the machine starts again, the process is reversed and WUs resume without losing any crunching time. Hints: It's a good idea to suspend BOINC activity before you hibernate, as some WUs occasionally don't survive the sudden revival. (Don't forget to resume BOINC when you start up though). In XP, you must have hibernation enabled in Control Panel >> Power Settings. [Edit] - In Win7, to enable full hibernation: Control Panel >> Power options. Click "Change plan settings" for your current plan, then "Change advanced power settings" >> Sleep >> Allow Hybrid sleep. Changing this to OFF will enable the Hibernate option in the shutdown menu, but in fact Hybrid Sleep might do what we want, too. Has anyone tried it?
----------------------------------------[Edit 2 times, last edit by Rickjb at Mar 31, 2011 10:54:20 AM] |
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
Very good point Rickjb!
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Flapper
Cruncher Joined: Nov 15, 2010 Post Count: 1 Status: Offline |
Hibernation in combination with leave applications in memory while suspended, seems to work for me.
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