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Forum: Teams
Thread: Minnesota Crunchers |
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Thread Status: Active Total posts in this thread: 6196
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kateiacy
Veteran Cruncher USA Joined: Jan 23, 2010 Post Count: 1027 Status: Offline Project Badges: 
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I throttle by cores because that reduces the RAM footprint too. Also, changing the CPU time is very ungranular. For instance, setting it to 80% ends up being like 4 seconds of 100% and 1 second of 0%. On my laptop that makes the fans spin up and down in rhythm. Kinda useless. The "old" WCG client was actually much better about this, it was probably sliced the time into miliseconds. I wish BOINC was granular like that... Thanks! That makes sense. Here's a follow-up question. On a dual core that hyperthreads, if I reduce the number of cores from 4 to 2, I believe each core is still fully utilized, just for one job at a time instead of 2. So would I have to reduce from 4 to 1 to make sure only 1 core was being used? Thanks again. This is my first summer as a very involved cruncher. Last summer I was just running one low-end HTPC 24/7 and didn't think about these questions very much.  |
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ultimaThule
Veteran Cruncher Joined: Apr 27, 2007 Post Count: 825 Status: Offline Project Badges: 
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Had a small set back a few days ago. Maybe this will cheer you up little.. Funny.. http://www.youtube.com/watch?v=sHzdsFiBbFc  [Edit 1 times, last edit by ultimaThule at Apr 11, 2011 8:06:47 PM] |
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Bearcat
Master Cruncher USA Joined: Jan 6, 2007 Post Count: 2803 Status: Offline Project Badges:
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You can reduce the heat a few different ways. Move your systems into a cool place, such as the basement. Little extreme for me so I reduce cores and crank up the fans a bit until I am comfortable with the temps. I use xeons so there made to take some heavy work. Regular cpu's probable shouldn't be stressed as much. As for GPU grid, am running win7, I had to finish all my work, uninstall boinc, then reinstall BUT make sure you do NOT run it as a service. Once I did that, my GPU was recognized and started crunching. Thanks, Bearcat (especially for answering when you're having a lot of pain. I hope your recovery gets much easier very soon.). Hmm, I wonder what my problem with GPUgrid is on the AMD Fusion machine. When BOINC comes up, it recognizes the graphics card, but I can't get any GPUgrid WUs. Collatz is running just fine. No problem. New prescription got most under control. You might have to many wu's in the hopper (GPU) to get more. Try draining, then try to get some from gpugrid.
Crunching for humanity since 2007!
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Warpedcow
Advanced Cruncher Joined: Mar 21, 2009 Post Count: 148 Status: Offline |
Thanks! That makes sense. Here's a follow-up question. On a dual core that hyperthreads, if I reduce the number of cores from 4 to 2, I believe each core is still fully utilized, just for one job at a time instead of 2. So would I have to reduce from 4 to 1 to make sure only 1 core was being used? Yes, but.... You could maybe use a third party tool to pin the BOINC processes to certain processors. I used to use a tool that would automatically pin processes based on wildcard match of the process name to whatever processors you wanted, but I stopped using that tool and the name escapes me... Also, this would only work if there isn't some abstraction layer between that and the processor itself. I wouldn't know if PID 0 and 1 are the "real" cores and PID 2 and 3 are the "HT" cores, or if it's numbered some other way, or if some abstraction layer shifts it around as needed so you have no chance of doing what you really want... I wish the BOINC client could be set to use X processors during hours A-B and Y processors during hours C-D. In Spring/Fall the nights are cool enough to run 4 cores... Right now the above is possible only if X or Y is zero! :)
Gaming/HTPC: Intel Q9550 @ 3.5ghz, 4GB DDR2, Radeon HD 4850
Primary Server: Intel Q9550 @ 3.0ghz, 8GB DDR2, Radeon HD 4830 Backup Server/Gaming: Intel Q9550 @ 3.4ghz, 8GB DDR2, Radeon HD 4870 My ICF Home Build: http://icfbuild.blogspot.com/ |
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Bearcat
Master Cruncher USA Joined: Jan 6, 2007 Post Count: 2803 Status: Offline Project Badges:
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Had a small set back a few days ago. Maybe this will cheer you up little.. Funny.. http://www.youtube.com/watch?v=sHzdsFiBbFc Have seen that before but thanks. Still funny. Got a good laugh again.
Crunching for humanity since 2007!
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Sgt.Joe
Ace Cruncher USA Joined: Jul 4, 2006 Post Count: 7701 Status: Offline Project Badges: 
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I throttle by cores because that reduces the RAM footprint too. Also, changing the CPU time is very ungranular. For instance, setting it to 80% ends up being like 4 seconds of 100% and 1 second of 0%. On my laptop that makes the fans spin up and down in rhythm. Kinda useless. The "old" WCG client was actually much better about this, it was probably sliced the time into miliseconds. I wish BOINC was granular like that... Thanks! That makes sense. Here's a follow-up question. On a dual core that hyperthreads, if I reduce the number of cores from 4 to 2, I believe each core is still fully utilized, just for one job at a time instead of 2. So would I have to reduce from 4 to 1 to make sure only 1 core was being used? Thanks again. This is my first summer as a very involved cruncher. Last summer I was just running one low-end HTPC 24/7 and didn't think about these questions very much. I think you are confusing core use with hyperthreading. You would enable/disable hyperthreading in the BIOS. If you disable hyperthreading and specify 1 core, you will have only one job running at a time on one core. Hope this helps. Cheers
Sgt. Joe
*Minnesota Crunchers* |
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Khyron
Advanced Cruncher Joined: Mar 17, 2006 Post Count: 103 Status: Offline Project Badges:
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Somebody put the pedal to metal yesterday. We don't go over a million (10^6) often but it sure is nice when we do. Nice crunchin all. Cheers   |
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Bearcat
Master Cruncher USA Joined: Jan 6, 2007 Post Count: 2803 Status: Offline Project Badges:
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Kate, another thing to check is your bios. Not sure on your setup but in both my asus and super micro boards, I can adjust how I want the fans to react. The asus has temp thresholds while the super micro let's me chose 4 options (can't remember the terminology). Not sure how loud you want the fans cranking though. My harpertowns run hot but after my last adjustment, my highest temp on one of my cores is 140f. Fans kick up about medium. Come hotter weather, got to reduce the cores or listen to a jet engine.
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Crunching for humanity since 2007!
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kateiacy
Veteran Cruncher USA Joined: Jan 23, 2010 Post Count: 1027 Status: Offline Project Badges:
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I think you are confusing core use with hyperthreading. You would enable/disable hyperthreading in the BIOS. If you disable hyperthreading and specify 1 core, you will have only one job running at a time on one core. Hope this helps. Cheers True confessions: my hottest-running machine is a Zotac MAG HTPC (ATOM/ION) with an ancient AMI BIOS. It's running under Ubuntu 10.04. For some reason, when I set hyperthreading off in the BIOS, BOINC doesn't see it, and I still get 4 WUs running at once. The only way I've found so far to cut that down to 2 WUs at a time is by specifying number or percent of cores to use. So I do understand the difference between HT and core use -- just haven't been able to successfully disable HT in the BIOS. |
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kateiacy
Veteran Cruncher USA Joined: Jan 23, 2010 Post Count: 1027 Status: Offline Project Badges:
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Kate, another thing to check is your bios. Not sure on your setup but in both my asus and super micro boards, I can adjust how I want the fans to react. The asus has temp thresholds while the super micro let's me chose 4 options (can't remember the terminology). Not sure how loud you want the fans cranking though. My harpertowns run hot but after my last adjustment, my highest temp on one of my cores is 140f. Fans kick up about medium. Come hotter weather, got to reduce the cores or listen to a jet engine. Thanks for another good thought. I'm pretty sure I can do that with the ASUS board in my AMD Phenom II machine, and I really do need to tinker with that. (Two of our dogs spend a lot of their time in my home office where my computers are, and they hate loud fan noise even more than I do!) I don't think the BIOS in my little machines can do that, although I need to look again. I don't know how they decide which menus to put functions under in some AMIBIOS. (My favorite is that to set up to boot from a USB flash drive, you do NOT go to the "Set boot device" menu, even though there is one. Oh no, that would be too easy. Instead you go to "Hard drive configuration.") I'd retire that crazy Zotac machine from crunching except that it's so reliable. It never makes errors -- just plods along doing 4 WCG WUs and one Collatz or Prime Grid 24/7 and producing valid results. Edit to fix typo. [Edit 1 times, last edit by kateiacy at Apr 12, 2011 10:56:26 PM] |
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