![]() You can set sysctl's temporarily until the next reboot, or permanently in a configuration file which is applied on each boot. CFS can be tuned using a few sysctl settings. On current Linux kernels, CPU time slices are allocated to tasks by CFS, the Completely Fair Scheduler. We can try to understand this suggestion in more detail. Technically this link says 10 μs, which would be 1000 times smaller. If tuning the time-slice is still relevant, is there is a new method which does not lock it down at build-time?įor most RHEL7 servers, RedHat suggest increasing sched_min_granularity_ns to 10ms and sched_wakeup_granularity_ns to 15ms. For Linux distributions, it is much more practical if they can have a single kernel per CPU architecture, and allow configuring it at runtime or at least at boot-time. Is the CPU scheduler time-slice still based on CONFIG_HZ?Īlso, in practice build-time tuning is very limiting. So I want to know what the current situation is. However I vaguely remember this being a thing, with the CONFIG_HZ build-time option. I do not personally want to change the timeslice. I am posting this based on my initial reaction to the question How to change Linux context-switch frequency? If you have two processes which use all the CPU time they can get, then switching less frequently can allow them to get more work done in the same time. If you have one process which uses all the CPU time it can get, and another process which interacts with the user, then switching more frequently can reduce delayed responses. However switching between processes has a cost, therefore there is a tradeoff. ![]() This feature is generally good, because it stops an individual process hogging the CPU and making the system completely non-responsive. This is the kernel feature described as "pre-emptive multi-tasking". This question asks how to reduce how frequently the kernel will force a switch between different processes running on the same CPU. Is it possible to increase the length of time-slices, which the Linux CPU scheduler allows a process to run for? How could I do this? Background knowledge
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