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World Community Grid Forums
Category: Support
Forum: BOINC Agent Support
Thread: Much smaller performance under linux? |
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Thread Status: Active Total posts in this thread: 18
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
Hallo,
I ran the integrated benchmark of Boinc. On Windows with Boinc 6.2.19 on Linux with Boinc 6.2.15 Of course on the same machine. On Windows I got 1997 floating point MIPS (Whetstone) per CPU 3549 integer MIPS (Dhrystone) per CPU On Linux 1526 floating point MIPS (Whetstone) per CPU 2368 integer MIPS (Dhrystone) per CPU Why is there so much less performance under Linux? Thanks for your answers. |
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JmBoullier
Former Community Advisor Normandy - France Joined: Jan 26, 2007 Post Count: 3716 Status: Offline Project Badges: 
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Have a look at your power management or cpufreq settings.
----------------------------------------By default Ubuntu (and probably some other Linux distros) installs with the energy saving settings. And since Boinc is running at the lowest priority it does not trigger the change to full power when it is running alone in the machine. Cheers. Jean. |
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
Is this a laptop?
I have a Lenovo/IBM laptop where I had to go into the BIOS a turn off the CPU Frequency setting to get it to use the entire CPU under Ubuntu and other distros. The power management driver for my laptop in windows can be set to run full bore but I still can't get the Linux driver it to work the way I want in Ubuntu. My 2 cents  |
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
Under ubuntu try disabling powernowd. Install sysv-rc-conf, run as root, scroll down to powernowd, use space to uncheck the boxes to disable starting on boot, then press minus to stop the service. Also there are probably a dozen easier ways to do that.
----------------------------------------Just went from 1604/4582 to 2386/6778. Would have been nice to find this out before running 4 years of CPU time at 2/3 speed. :p [Edit 1 times, last edit by Former Member at Nov 21, 2008 8:49:17 AM] |
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JmBoullier
Former Community Advisor Normandy - France Joined: Jan 26, 2007 Post Count: 3716 Status: Offline Project Badges:
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Is this a laptop? Laptops are more exposed to this problem because most of them have power management features. But many desktops have it too now, which might explain why we are seeing this problem reported more and more. Cheers. Jean. |
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
It is a laptop, but Powermanagment is not running. There is a systemmonitor within the distribution (=Slax) and there it shows that the Processor runs at 2 GHz which is also the maximum clock frequency the processor supports.
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JmBoullier
Former Community Advisor Normandy - France Joined: Jan 26, 2007 Post Count: 3716 Status: Offline Project Badges:
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OK. I assume that you have watched it long enough while Boinc is crunching and that we can eliminate the case of some excessive temperature which would trigger the processor self-protection feature.
----------------------------------------Other things that you can check, with apologies if you find them obvious: - Boinc throttling. Is it allowed to run at 100 % ? (although I don't think the benchmark would be affected, but I am not sure) - have you run top to make sure that you have no other process which would suck some of the processor's power? For example a web browser "idle" on some of these Home pages with lots of ads flashing all over the screen... Cheers. Jean. |
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
I did the benchmark in Windows and Linux when Boinc wasn't registered to a project yet.
I'm pretty sure that there was no throttling since the fan works correct. Boinc was allowed on Windows and Linux to use 100 % CPU. There weren't running any other application on linux, just the bash from where I started Boinc. Under Windows there ran something like antivir. |
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JmBoullier
Former Community Advisor Normandy - France Joined: Jan 26, 2007 Post Count: 3716 Status: Offline Project Badges:
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I am sorry I am a little short of new ideas at this stage. I hope Didactylos will read this thread and suggest other things to check. If he has missed it I will send him a message backstage.
----------------------------------------The only thing I can add right now is that it is possible to have the same FP benchmark under Windows and Linux. For the integer benchmark you can even have a better one if like me your Windows is 32-bit and your Linux is 64-bit!  Cheers. Jean. |
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jal2
Senior Cruncher USA Joined: Apr 28, 2007 Post Count: 422 Status: Offline Project Badges: 
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I'm not sure you mentioned which distro are you using (slacware?), or which utility you used to see what tasks are running, such as the top command.
----------------------------------------I had a similar problem in SuSE where the Beagle search engine background task was stuck in a loop. Once I disabled that program (I didn't need it on my file server) my Boinc performance improved significantly. |
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