Re: [linux-audio-dev] Re: costs of IPC

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Subject: Re: [linux-audio-dev] Re: costs of IPC
From: Steve Harris (S.W.Harris_AT_ecs.soton.ac.uk)
Date: Wed May 16 2001 - 15:24:23 EEST

In ctx mp mode, do all the processes get run with a high priority
(SCHED_FIFO or whatever), or are they run as normal userland processes?
They look pretty normal in top:

  PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME COMMAND
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 1461 root 15 0 105M 105M 7092 S 4.3 21.0 47:05 XFree86
23676 swh 15 0 1104 1104 840 R 2.7 0.2 0:06 top
29956 root 12 0 692 692 560 S 2.5 0.1 0:00 ctx.tmp
29960 root 12 0 692 692 560 S 1.9 0.1 0:00 ctx.tmp
29958 root 12 0 692 692 560 R 1.5 0.1 0:00 ctx.tmp
29955 root 13 0 692 692 560 S 1.3 0.1 0:00 ctx.tmp
29959 root 14 0 692 692 560 R 1.1 0.1 0:00 ctx.tmp
29929 root 14 0 576 576 520 S 0.9 0.1 0:00 ctx.tmp
29961 root 13 0 692 692 560 R 0.9 0.1 0:00 ctx.tmp
29962 root 12 0 692 692 564 S 0.9 0.1 0:00 ctx.tmp
29957 root 15 0 692 692 560 R 0.5 0.1 0:00 ctx.tmp
 1472 swh 9 0 3104 3104 2480 S 0.1 0.6 3:00 magicdev
 1501 swh 9 0 4280 4280 3464 S 0.1 0.8 0:13 deskguide_ap
    7 root -1 -20 0 0 0 SW< 0.0 0.0 0:00 mdrecoveryd

Theres the "Scheduler set to Round Robin with priority 99..." message, but
I'm not sure if/how that applies to processes or just threads.

- Steve

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