Messages in this thread | | | Date | Mon, 20 Aug 2012 07:51:52 -0700 | Subject | Re: changing timeslice in linux | From | Xin Tong <> |
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On Sun, Aug 19, 2012 at 10:54 PM, Mike Galbraith <efault@gmx.de> wrote: > On Sun, 2012-08-19 at 11:58 -0700, Xin Tong wrote: >> I have 2 questions about linux 2.6 x86_64 scheduler. >> >> 1. is the default scheduling algorithm SCHED_NORMAL in linux ? > > Yes. Is there any document describing what the sched_normal is ? it is more difficult than SCHED_RR to infer its meaning just based on its name ? > >> 2. how do i change the time slice in linux source code ? > > You shouldn't need to. You can tune "slice" by adjusting > sched_latency_ns and sched_min_granularity_ns, but note that "slice" is > not a fixed quantum. Also note that CFS preemption decisions are based > upon instantaneous state. A task may have received a full (variable) > "slice" of CPU time, but preemption will be triggered only if a more > deserving task is available, so a "slice" is not the "max uninterrupted > CPU time" that you may expect it to be.. but it is somewhat similar. > > -Mike > This can be done without recompiling and reinstalling the kernel ? maybe one simply needs to write to a device file under /dev ?
Xin
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