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World Community Grid Forums
Category: Community
Forum: Hardware Chat Room
Thread: CPU and granted time |
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Thread Status: Active Total posts in this thread: 24
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Nope.avi
Cruncher Joined: Sep 17, 2013 Post Count: 8 Status: Offline Project Badges: 
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When it comes to being granted time, does it really matter what kind of CPU you use?
Will running a 4 year old cpu still grant you the same amount of time as running a 2017 cpu? What kind of CPU is best for gaining as much time as possible? Specifically, what aspect of the CPU is the most crucial for getting as much time as possible e.g.: number of cores, clock speed, microarchitecture, cache etc.....? Also, will running your system at 60% generate less time than if it was running at 90% utilization? |
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Sgt.Joe
Ace Cruncher USA Joined: Jul 4, 2006 Post Count: 7655 Status: Offline Project Badges: 
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When it comes to being granted time, does it really matter what kind of CPU you use? Will running a 4 year old cpu still grant you the same amount of time as running a 2017 cpu? It makes no difference what cpu you use, the time granted for completing a work unit is that for which you get credit. A newer or more powerful cpu will finish the work units faster and get more work done per unit of time, and thus more points, but it still only gets credit for its own accrued time. Each thread in a multi core cpu accrues its own time. For instance a single core non-hyperthreaded cpu running for 24 hours will accrue 1 day of time. A 4 core hyperthreaded cpu running for 24 hours will accrue 192 hours or 8 days (4 cores times 2 threads per core times 24 hours.) What kind of CPU is best for gaining as much time as possible? Specifically, what aspect of the CPU is the most crucial for getting as much time as possible e.g.: number of cores, clock speed, microarchitecture, cache etc.....? The more cores or threads you have, the more time you will accrue. Also, will running your system at 60% generate less time than if it was running at 90% utilization? Yes Cheers
Sgt. Joe
*Minnesota Crunchers* |
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TonyEllis
Senior Cruncher Australia Joined: Jul 9, 2008 Post Count: 261 Status: Offline Project Badges: 
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To maximise your time granted you need to run the CPU at 100% utilization in the BOINC setting. If that causes over-heating problems - you need to reduce the CPU power to bring the CPU temperature down to a safe level.
----------------------------------------Have a laptop running Windows 8.1 that I also use for WCG when it's not needed for other use. Initially could only run the CPU BOINC setting at 65% to stay within safe limits. By reducing the CPU power to 85% am able to run with BOINC set at 100% CPU utilization and stay within the same safe temperature with a bonus of slightly shorter effective times to complete WUs. Gkrellm confirms 100% use... I used the instructions at http://www.addictivetips.com/windows-tips/how...om-overheating-windows-7/ - worked the same for Windows 8.1 and would expect Windows 10 to be very similar. The desktops here run Linux - so a few simple scripts adjust the CPU frequency automatically to stop the CPUs from over-heating during the hot Australian summers. (No air conditioners). see http://www.sraellis.tk/master-frame-control_cpu_temp.html for details if interested.
Run Time Stats https://grassmere-productions.no-ip.biz/
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vlado101
Senior Cruncher Joined: Jul 23, 2013 Post Count: 226 Status: Offline Project Badges: 
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Hi TonyEllis,
----------------------------------------Thank you for providing the guide :) I am going to see if Win10 will have the same options.  |
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Nope.avi
Cruncher Joined: Sep 17, 2013 Post Count: 8 Status: Offline Project Badges:
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Thanks.
Does more cores/threads=more time apply to both Intel and AMD CPU's? |
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Sgt.Joe
Ace Cruncher USA Joined: Jul 4, 2006 Post Count: 7655 Status: Offline Project Badges:
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Thanks. Does more cores/threads=more time apply to both Intel and AMD CPU's? Yes Cheers
Sgt. Joe
*Minnesota Crunchers* |
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KLiK
Master Cruncher Croatia Joined: Nov 13, 2006 Post Count: 3108 Status: Offline Project Badges: 
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When it comes to being granted time, does it really matter what kind of CPU you use? Will running a 4 year old cpu still grant you the same amount of time as running a 2017 cpu? What kind of CPU is best for gaining as much time as possible? Specifically, what aspect of the CPU is the most crucial for getting as much time as possible e.g.: number of cores, clock speed, microarchitecture, cache etc.....? Also, will running your system at 60% generate less time than if it was running at 90% utilization? No, the time for computation is same on newer CPUs, then on older... BUT, newer CPUs got bigger cores...so running system on 4yo CPU is 2-3% of CPU, while on newer CPU it's 0,5-1% CPU time...so that time can be used for WCG calcs... Essentially, it's a small difference!  Best CPUs are the multi-core HT units & I'd suggest intel...cache is always good to have! Clock speed doesn't matter, unless you want to get more results back...about microarchitecture: Xeons or similars are better than normal. Personally on Win (as I'm running also SETi@home & have overcooked several GPUs with it) I run Tthrottle: https://efmer.com/ Just set it on some nice 75°C & enjoy it...works like a charm!  |
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KerSamson
Master Cruncher Switzerland Joined: Jan 29, 2007 Post Count: 1672 Status: Offline Project Badges:
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Just set it on some nice 75°C & enjoy it On my side, I maintain a core temperature < 65°C (Intel i7), or < 60°C (AMD Phenom II x6). For a 24/7/365.25 operation, I consider that 75°C core temperature is too hot (even if it is allowed by the BIOS). With a good CPU air cooler and a reasonable case, it should not be an issue, even at 100% CPU load. Cheers, Yves |
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KLiK
Master Cruncher Croatia Joined: Nov 13, 2006 Post Count: 3108 Status: Offline Project Badges:
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Just set it on some nice 75°C & enjoy it On my side, I maintain a core temperature < 65°C (Intel i7), or < 60°C (AMD Phenom II x6). For a 24/7/365.25 operation, I consider that 75°C core temperature is too hot (even if it is allowed by the BIOS). With a good CPU air cooler and a reasonable case, it should not be an issue, even at 100% CPU load. Cheers, Yves Maybe for i7...but I run Kentsfields & Yorkfields CPUs, which have 100°C TDP, so I gave them 20% margin on Tthrottle. They are cheap, after all... |
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
If you are interested in WCG run time only just for hunting badges then you may want to try a bare metal hypervisor like hyperv. Each vCPU will account for CPU time.
Example: An i7 would allow to assign up to 8 vCPUs per VM. Install three ubuntuvms with boinc client and let the boinc client run at 100% in the VM and you get 8 x 3 = 24 hours run time per day. Some BIOS allow to set the clock speed to static low running the CPU at is minimal frequency or disable Intel Turbo Speed. No overheating issues. |
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