Bug 1038283
| Summary: | Boinc doesn't load all CPU cores. | ||||||||||||||
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| Product: | [Fedora] Fedora | Reporter: | Sergejs Svoboda <sparc64> | ||||||||||||
| Component: | boinc-client | Assignee: | Mattia Verga <mattia.verga> | ||||||||||||
| Status: | CLOSED ERRATA | QA Contact: | Fedora Extras Quality Assurance <extras-qa> | ||||||||||||
| Severity: | unspecified | Docs Contact: | |||||||||||||
| Priority: | unspecified | ||||||||||||||
| Version: | 20 | CC: | cheekyboinc, floydbarber, mattia.verga, mmahut, raphael.brandis, sparc64, xjakub | ||||||||||||
| Target Milestone: | --- | ||||||||||||||
| Target Release: | --- | ||||||||||||||
| Hardware: | x86_64 | ||||||||||||||
| OS: | Unspecified | ||||||||||||||
| Whiteboard: | |||||||||||||||
| Fixed In Version: | boinc-client-7.2.33-3.git1994cc8.fc20 | Doc Type: | Bug Fix | ||||||||||||
| Doc Text: | Story Points: | --- | |||||||||||||
| Clone Of: | Environment: | ||||||||||||||
| Last Closed: | 2014-02-16 23:15:26 UTC | Type: | Bug | ||||||||||||
| Regression: | --- | Mount Type: | --- | ||||||||||||
| Documentation: | --- | CRM: | |||||||||||||
| Verified Versions: | Category: | --- | |||||||||||||
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |||||||||||||
| Cloudforms Team: | --- | Target Upstream Version: | |||||||||||||
| Embargoed: | |||||||||||||||
| Bug Depends On: | 1039258 | ||||||||||||||
| Bug Blocks: | |||||||||||||||
| Attachments: |
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Created attachment 832850 [details]
System-monitor screenshot 2
I cannot reproduce this bug. Please take a look in the first lines of the "Event log" (open boinc manager and press SHIFT+E). You should see a line starting with "max CPUs used:". What it says? Also, from the screenshots it seems you're running only one project (Poem) that has a multithreaded app, is that right? It seems there are 4 instances of that project running, so it seems everything ok (if you have a 4 core CPU). I had the exact same problem running World Community Grid. Please also take a look at this thread, where there are a couple of users who experienced this bug, all using Fedora: http://boinc.berkeley.edu/dev/forum_thread.php?id=8715 To make it clear: The log does say "Number of CPUs: 4" and 4 tasks are started, but they only use about 75% of the total CPU time, so that when a task is finished, the figures "Elapsed time" and "CPU time" differ significantly more than usual. Number of cores = number of active BOINC tasks. But, as you could see from my screenshots - 2 cores loaded almost 100%, but remaining 2 cores only ~50% each. I believe - those tasks using 1 core for both. Comparing with Fedora 17: its highly visible that Boinc crunch less tasks and CPU temperature is much lower for some cores. CPU usage graph also shows higher load. (always 100% for all cores) For now it is unachievable on Fedora 20. I noticed that on my system I have high cpu usage by Ksoftirqd when I run boinc (I'm on KDE). This takes a lot of CPU, in F17 it didn't do that. Maybe it's the same problem for you, if you're using Gnome it's maybe some other process that controls IRQs that eats a lot of CPU. Can you please look in a console what 'top' command says? Do you see any process not boinc related that eats a lot of CPU (in my case ksoftirqd eats 7% of each core when GPU is not used and 16% of each core when using GPU apps....). Created attachment 840027 [details]
CPU usage diagram
You could distinctly see, that most of the time 1 core is idle.
Of course some other running processes eats CPU ( 4% - 8% ). But anyway, even if this value is 25% - why BOINC doesn't load other 75% ??? Created attachment 840034 [details]
CPU with/without GPU
I don't know why, but as you can see from my screenshot I have your exact problem with GPU enabled (in the graph you can see that in the first seconds there is always a core idle and three at 100%), but as soon as I disable GPU all four cores become active at 100% and ksoftirqd does not eat CPU cicles anymore.
I'm using boinc 7.2.33 available in updates-testing. Before updating (boinc 7.0.65) ksoftirqd had high cpu usage even with GPU disabled. Please try out the updates-testing version and see if it resolve the problem (but I still think this is something due to how kernel handles CPU load/interrupts rather than a boinc problem).
I opened a bug against kernel about my problem, but seems not to be considered: #1016797
Didn't help me. I enabled "updates-testing" repo and installed all available updates. Also I added to Boinc "cc_config.xml" configuration file "<no_gpus>1</no_gpus>" line. Can you try to remove CPUShares=2 from /lib/systemd/system/boinc-client.service ? Seems to me very low (according with systemd.exec man default is 1024) and I have removed it long time ago Created attachment 842342 [details]
CPU usage without "CPUShares=2"
Seems that helped. Now all cores have ~ 100% load.
Just tried if the problem does still occur with the new BOINC 7.2.33 packages - it does. But: Removing CPUShares=2 from /lib/systemd/system/boinc-client.service (as suggested by Lorenzo Mastrogiacomi) indeed solved it for me. Thanks! I've already applied the change in rawhide, it will be fixed in the next boinc build. boinc-client-7.2.33-3.git1994cc8.fc20 has been submitted as an update for Fedora 20. https://admin.fedoraproject.org/updates/boinc-client-7.2.33-3.git1994cc8.fc20 Package boinc-client-7.2.33-3.git1994cc8.fc20: * should fix your issue, * was pushed to the Fedora 20 testing repository, * should be available at your local mirror within two days. Update it with: # su -c 'yum update --enablerepo=updates-testing boinc-client-7.2.33-3.git1994cc8.fc20' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/FEDORA-2014-2160/boinc-client-7.2.33-3.git1994cc8.fc20 then log in and leave karma (feedback). boinc-client-7.2.33-3.git1994cc8.fc20 has been pushed to the Fedora 20 stable repository. If problems still persist, please make note of it in this bug report. |
Created attachment 832849 [details] System-monitor screenshot Description of problem: Boinc can't load all 4 cores on my system. Even on freshly installed Fedora 19 or 20 beta. Version-Release number of selected component (if applicable): Boinc-client version: 7.0.65 How reproducible: Steps to Reproduce: 1. Adjust Boinc settings to use all cores, all the time - 100%. 2. Run any single Boinc project. Actual results: One core is almost idle all the time. Expected results: All 4 cores loaded 100%. Additional info: Fedora 17 with Boinc 7.0.29 (Latest from its repository) loads processor cores much better. Almost 100% for all cores all the time. At least based on standard gnome system-monitor readings.