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World Community Grid Forums
Category: Support
Forum: BOINC Agent Support
Thread: Number of Simultaneous Projects |
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Thread Status: Active Total posts in this thread: 5
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MDHC
Cruncher Joined: Dec 8, 2008 Post Count: 11 Status: Offline Project Badges: 
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Why does BOINC give me multiple projects simultaneously? Wouldn't it be better to focus all computer resources on one job at a time and finish each more rapidly? How can I adjust the settings to work on only one project at a time?
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Sekerob
Ace Cruncher Joined: Jul 24, 2005 Post Count: 20043 Status: Offline |
Hi MDHC,
----------------------------------------What do you mean with working on 1 project/job at the time... multithreaded on one CPU that can do that, but quicker? It can not... WCG has only 1 task one thread science applications [there are maybe 1 or 2 in the whole BOINC world that can]! You mean to say for WCG to let the other researchers wait until we're finished with, say FightAIDS e.g.? That would not be fair and the purpose of WCG hosting multiple science for you to choose from. According your badges you've contributed towards 6 sciences. If you wish to change that go to either My Grid > My Projects of My Grid > Device Manager > Device Profiles. Let us know if that answers your questions.
WCG
----------------------------------------Please help to make the Forums an enjoyable experience for All! [Edit 1 times, last edit by Sekerob at May 19, 2010 6:42:22 AM] |
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MDHC
Cruncher Joined: Dec 8, 2008 Post Count: 11 Status: Offline Project Badges:
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Ah perhaps rather than "project" I meant job/task. Rather than running 8 jobs/tasks simultaneously (CMD20490... * 8) and devoting 1/8th of comp time to each, can I not just focus on one task at a time?
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I'm here to spread love all over the world.
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gb009761
Master Cruncher Scotland Joined: Apr 6, 2005 Post Count: 3010 Status: Offline Project Badges: 
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Hi MDHC, by your last comment, I'm presuming that you've got a quad-core computer that has hyperthreading switched on - which gives you 8 cores in total (i.e., the equivalent of 8 separate single-core computers). Thus, you've got the ability to process up to 8 Work Units (WU's) at any one time.
----------------------------------------If you just wanted the 1 WU to process on your computer, due to the nature of the science (which doesn't allow the WU to be split up between cores), it'd actually do 8 times LESS work than it currently can handle - i.e., the WU wouldn't be processed 8 times quicker. I hope this makes sense   |
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
Hi MDHC,
I will get a little technical. Assuming you have enough memory to run 8 projects simultaneously, a hyperthreading quad-core is most productive running 8 tasks. With hyperthreading turned off, each core runs one task at maximum speed. Actually, memory contention means that the 4 tasks will run slightly longer than a single task would, but this is a very minor effect, so we will ignore it. With hyperthreading turned on, the situation becomes more complex. The rule of thumb says that a core running 2 threads will produce 1.15 to 1.25 the output per unit time as it would running only one thread. So each individual thread will run much slower, but total throughput will be 15 to 25% greater. 4 cores hyperthreading will produce as much as 5 non-hyperthreading cores. Lawrence |
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