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modules/nix-daemon: Amend daemon(CPU|IO)Sched(Policy|Class) description (#147497)

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Suggest appropriate values for various types of systems and add some
formatting.
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Mikael 2021-12-10 11:30:51 +01:00 committed by GitHub
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nixos/modules/services/misc/nix-daemon.nix
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@ -192,15 +192,28 @@ in
example = "batch";
description = ''
Nix daemon process CPU scheduling policy. This policy propagates to
build processes. other is the default scheduling policy for regular
tasks. The batch policy is similar to other, but optimised for
non-interactive tasks. idle is for extremely low-priority tasks
that should only be run when no other task requires CPU time.
build processes. <literal>other</literal> is the default scheduling
policy for regular tasks. The <literal>batch</literal> policy is
similar to <literal>other</literal>, but optimised for
non-interactive tasks. <literal>idle</literal> is for extremely
low-priority tasks that should only be run when no other task
requires CPU time.
Please note that while using the idle policy may greatly improve
responsiveness of a system performing expensive builds, it may also
slow down and potentially starve crucial configuration updates
during load.
Please note that while using the <literal>idle</literal> policy may
greatly improve responsiveness of a system performing expensive
builds, it may also slow down and potentially starve crucial
configuration updates during load.
<literal>idle</literal> may therefore be a sensible policy for
systems that experience only intermittent phases of high CPU load,
such as desktop or portable computers used interactively. Other
systems should use the <literal>other</literal> or
<literal>batch</literal> policy instead.
For more fine-grained resource control, please refer to
<citerefentry><refentrytitle>systemd.resource-control
</refentrytitle><manvolnum>5</manvolnum></citerefentry> and adjust
<option>systemd.services.nix-daemon</option> directly.
'';
};
@ -210,13 +223,20 @@ in
example = "idle";
description = ''
Nix daemon process I/O scheduling class. This class propagates to
build processes. best-effort is the default class for regular tasks.
The idle class is for extremely low-priority tasks that should only
perform I/O when no other task does.
build processes. <literal>best-effort</literal> is the default
class for regular tasks. The <literal>idle</literal> class is for
extremely low-priority tasks that should only perform I/O when no
other task does.
Please note that while using the idle scheduling class can improve
responsiveness of a system performing expensive builds, it might also
slow down or starve crucial configuration updates during load.
Please note that while using the <literal>idle</literal> scheduling
class can improve responsiveness of a system performing expensive
builds, it might also slow down or starve crucial configuration
updates during load.
<literal>idle</literal> may therefore be a sensible class for
systems that experience only intermittent phases of high I/O load,
such as desktop or portable computers used interactively. Other
systems should use the <literal>best-effort</literal> class.
'';
};