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The nix.daemonNiceLevel options allows for setting the nice level of the Nix daemon process. On a modern Linux kernel with group scheduling the nice level only affects threads relative to other threads in the same task group (see sched(7)). Therefore this option has not the effect one might expect. The options daemonCPUSchedPolicy and daemonIOSchedClass are introduced and the daemonIONiceLevel option renamed to daemonIOSchedPrority for consistency. These options allow for more effective control over CPU and I/O scheduling. Instead of setting daemonNiceLevel to a high value to increase the responsiveness of an interactive system during builds -- which would not have the desired effect, as described above -- one could set both daemonCPUSchedPolicy and daemonIOSchedClass to idle. |
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