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thread/Util: lower the real-time priority from 50 to 40

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On linux-rt, kernel IRQ threads are configured with priority=50, and
this change configures MPD somewhat below that priority, leaving some
room for other programs to be configured in between.

Closes https://github.com/MusicPlayerDaemon/MPD/issues/643
This commit is contained in:
Max Kellermann
2019-10-09 14:40:02 +02:00
parent 2f3e94f8d0
commit c89c7f71a2
5 changed files with 10 additions and 9 deletions
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8
doc/user.rst
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@@ -804,13 +804,13 @@ This is only possible you allow :program:`MPD` to do it. This privilege is contr
.. code-block:: none
ulimit -HS -r 50; mpd
ulimit -HS -r 40; mpd
Or you can use the :command:`prlimit` program from the util-linux package:
.. code-block:: none
prlimit --rtprio=50 --rttime=unlimited mpd
prlimit --rtprio=40 --rttime=unlimited mpd
The systemd service file shipped with :program:`MPD` comes with this setting.
@@ -828,10 +828,10 @@ You can verify whether the real-time scheduler is active with the ps command:
PID TID CLS RTPRIO COMMAND
16257 16257 TS - mpd
16257 16258 TS - io
16257 16259 FF 50 rtio
16257 16259 FF 40 rtio
16257 16260 TS - player
16257 16261 TS - decoder
16257 16262 FF 50 output:ALSA
16257 16262 FF 40 output:ALSA
16257 16263 IDL 0 update
The CLS column shows the CPU scheduler; TS is the normal scheduler; FF and RR are real-time schedulers. In this example, two threads use the real-time scheduler: the output thread and the rtio (real-time I/O) thread; these two are the important ones. The database update thread uses the idle scheduler ("IDL in ps), which only gets CPU when no other process needs it.