Message boards :
Number crunching :
CPU time difference
Message board moderation
Author | Message |
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Matthew@SETI@home Send message Joined: 14 Feb 16 Posts: 40 Credit: 9,278,146 RAC: 6 |
Re: http://setiathome.berkeley.edu/workunit.php?wuid=2173961623 How can two computers rated at roughly the same speed produce the same result, one consuming 8X the CPU time as the other? |
Raistmer Send message Joined: 16 Jun 01 Posts: 6325 Credit: 106,370,077 RAC: 121 |
Re: http://setiathome.berkeley.edu/workunit.php?wuid=2173961623 Hm... very interesting case. What about cache (L2 cache) size of your i3 and wingman's i5? |
HAL9000 Send message Joined: 11 Sep 99 Posts: 6534 Credit: 196,805,888 RAC: 57 |
Re: http://setiathome.berkeley.edu/workunit.php?wuid=2173961623 All CPU tasks on your i3-6100 are taking a very long time. You may want to use an app like CPUz to confirm that your CPU is running at its rated clock speed. If it isn't perhaps there could be a thermal issue. If everything looks OK I would suggest suspending GPU processing and see if the CPU times improve. SETI@home classic workunits: 93,865 CPU time: 863,447 hours Join the [url=http://tinyurl.com/8y46zvu]BP6/VP6 User Group[ |
HAL9000 Send message Joined: 11 Sep 99 Posts: 6534 Credit: 196,805,888 RAC: 57 |
Re: http://setiathome.berkeley.edu/workunit.php?wuid=2173961623 i3-6100 3MB i5-2500 6MB http://ark.intel.com/compare/52209,90729 SETI@home classic workunits: 93,865 CPU time: 863,447 hours Join the [url=http://tinyurl.com/8y46zvu]BP6/VP6 User Group[ |
Matthew@SETI@home Send message Joined: 14 Feb 16 Posts: 40 Credit: 9,278,146 RAC: 6 |
If everything looks OK I would suggest suspending GPU processing and see if the CPU times improve. How do you suspend GPU processing on just one machine of three? |
Al Send message Joined: 3 Apr 99 Posts: 1682 Credit: 477,343,364 RAC: 482 |
Right click on the BOINC icon in the task tray down by the clock, and choose Snooze GPU tasks. That should do it. |
Matthew@SETI@home Send message Joined: 14 Feb 16 Posts: 40 Credit: 9,278,146 RAC: 6 |
Ah, ok. Different definition of "snooze" from what I'm used to, which means automatic resume after x time. I'll try that if it comes to it. But I suspect it wouldn't survive a restart, so it wouldn't do as a long-term solution. I haven't installed CPU-Z yet, but I did install Core Temp, which shows core temps around 60-65C with brief spikes as high as 75C. Is that high? If so, what should I do to address it? Take it to the shop and have them make sure the fan is working as designed? There is little if any noise, but I can feel warm air exiting the rear (very slowly). The computer is a 2-month-old Acer desktop. What about cache (L2 cache) size of your i3 and wingman's i5? Per Core Temp: L1 128KB, L2 512KB, L3 3MB |
Richard Haselgrove Send message Joined: 4 Jul 99 Posts: 14653 Credit: 200,643,578 RAC: 874 |
'Snooze' is for a fixed interval of 1 hour. |
HAL9000 Send message Joined: 11 Sep 99 Posts: 6534 Credit: 196,805,888 RAC: 57 |
Right click on the BOINC icon in the task tray down by the clock, and choose Snooze GPU tasks. That should do it. That will only cause GPU processing to stop for 1 hr. Using the menu option to select suspend GPU processing will remain active until changed again by the user. SETI@home classic workunits: 93,865 CPU time: 863,447 hours Join the [url=http://tinyurl.com/8y46zvu]BP6/VP6 User Group[ |
Matthew@SETI@home Send message Joined: 14 Feb 16 Posts: 40 Credit: 9,278,146 RAC: 6 |
Using the menu option to select suspend GPU processing will remain active until changed again by the user. Got it, that does survive a restart. Thought I knew the BOINC manager better than that! |
Raistmer Send message Joined: 16 Jun 01 Posts: 6325 Credit: 106,370,077 RAC: 121 |
do you have similar difference with MultiBeam tasks too? |
Matthew@SETI@home Send message Joined: 14 Feb 16 Posts: 40 Credit: 9,278,146 RAC: 6 |
I don't know, I don't have many in the current tasks list that look like apples-to-apples comparisons. See for yourself: http://setiathome.berkeley.edu/results.php?hostid=7973906&offset=0&show_names=0&state=4&appid=29 Here's one that shows a 3X difference instead of 8X: http://setiathome.berkeley.edu/workunit.php?wuid=2174577485 |
Raistmer Send message Joined: 16 Jun 01 Posts: 6325 Credit: 106,370,077 RAC: 121 |
I don't know, I don't have many in the current tasks list that look like apples-to-apples comparisons. See for yourself: http://setiathome.berkeley.edu/results.php?hostid=7973906&offset=0&show_names=0&state=4&appid=29 Check if CPU operates on stock (3,7GHz) freq indeed and no iGPU tasks running. If big difference still remain then it's smaller cache effect perhaps. For MB it should be smaller than for AP (just as you see right now). |
Stephen "Heretic" Send message Joined: 20 Sep 12 Posts: 5557 Credit: 192,787,363 RAC: 628 |
Re: http://setiathome.berkeley.edu/workunit.php?wuid=2173961623 . . HI, . . I have a core i5-6400 and disabled crunching on the iGPU (same as yours a HD530) some time ago because it was crippling the output of this machine. . . Your i3 will probably be a little slower than the i5 you were comparing it to but if you go your home page and in seti@home preferences turn of iGPU processing you will be doing yourself a favour. You may want to update some drivers as well. There may also be some other issues, how hot is the climate you are in? My machine is only running at 53 deg C with 3 CPU.s crunching and running an Nvidia graphics card. But as others have advised you running Seti on iGPU's can be problematical, it slows down the CPU performace surpisingly badly. When I was using the GPU my CPU tasks were taking 3.5 hours to run, when I stopped it the runtimes dropped to about 2 hours. I then did a Lunatics install and the times are now just over an hour per WU running under AVX. . . Running just 3 CPU's my output has been far better than when I was running 3CPUs and the iGPU. Of course it is getting better again since I added the Nvidia graphics card :) |
Wiggo Send message Joined: 24 Jan 00 Posts: 34831 Credit: 261,360,520 RAC: 489 |
Yep, you can't compare i3 CPU times to i5 times as the i3 is 4 virtual cores made out of 2 physical cores whereas the i5 is just 4 pure cores, no comparison at all. Cheers. |
HAL9000 Send message Joined: 11 Sep 99 Posts: 6534 Credit: 196,805,888 RAC: 57 |
Yep, you can't compare i3 CPU times to i5 times as the i3 is 4 virtual cores made out of 2 physical cores whereas the i5 is just 4 pure cores, no comparison at all. Their i3 host is clearly having some other issue. My old i3-390M can complete work several times faster than what they are presently seeing. SETI@home classic workunits: 93,865 CPU time: 863,447 hours Join the [url=http://tinyurl.com/8y46zvu]BP6/VP6 User Group[ |
Matthew@SETI@home Send message Joined: 14 Feb 16 Posts: 40 Credit: 9,278,146 RAC: 6 |
Core Temp shows Frequency as: 3688.27MHz (99.68 x 37.0). With that info is there any need to install CPU-Z? After about a day, Core Temp now shows Max Core Temp as 79C, up from 75C after 30 minutes. Immediate temps still in the 60-65 range. Any other suggestions as to how to proceed? I can't live with a significantly underperforming computer, but this problem exceeds my geek level. |
Raistmer Send message Joined: 16 Jun 01 Posts: 6325 Credit: 106,370,077 RAC: 121 |
I can't live with a significantly underperforming computer, but this problem exceeds my geek level. Try to limit number of cores BOINC use to 2 instead of 4. How this will affect runtime? |
Matthew@SETI@home Send message Joined: 14 Feb 16 Posts: 40 Credit: 9,278,146 RAC: 6 |
Try to limit number of cores BOINC use to 2 instead of 4. This is by specifying "Use at most 50% of the CPUs" in Computing preferences? How this will affect runtime? I wouldn't know how to measure that with any accuracy, without running the same task before and after the change, which I assume is not possible. Host RAC might be useful, although it has yet to level out for this computer. |
Raistmer Send message Joined: 16 Jun 01 Posts: 6325 Credit: 106,370,077 RAC: 121 |
Just do same comparison for few tasks as at thread start. If the reason is hyperthreaded cores change will be quite significant. |
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