Messages in this thread | | | Date | Sat, 12 Apr 1997 13:41:36 +0200 | From | Harald Koenig <> | Subject | Re: how to set priority for idle process ? |
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On Apr 12, Charlie Ross wrote:
> you can nice with negative values up to -20... from what I understand, a > process at -20 wont swap, or relinquish any cpu time unless its fighting > with another -20 process...
even this is only theory:
PID USER PRI NI SIZE RES SHRD STAT %CPU %MEM TIME COMMAND 1096 root 15 -20 780 220 172 R < 63.5 0.7 0:30 niceloop -20 1095 root 17 0 780 220 172 R 33.0 0.7 0:18 niceloop 0
and I don't want to run the whole system at negative priorities (I need them for a few other almost realtime tasks) just to be able to have a real and only "idle task" in user space...
Harald ------------------------------------------------------------------------------- /* niceloop.c */
#include <stdio.h> #include <stdlib.h> #include <sys/time.h> #include <sys/resource.h>
void main(int argc, char *argv[]) { if (argc>1) { int p = atoi(argv[1]); printf("prio %d",getpriority(PRIO_PROCESS, 0)); setpriority(PRIO_PROCESS, 0, p); printf(" -> %d\n",getpriority(PRIO_PROCESS, 0)); }
while(1); }
-- All SCSI disks will from now on ___ _____ be required to send an email notice 0--,| /OOOOOOO\ 24 hours prior to complete hardware failure! <_/ / /OOOOOOOOOOO\ \ \/OOOOOOOOOOOOOOO\ \ OOOOOOOOOOOOOOOOO|// Harald Koenig, \/\/\/\/\/\/\/\/\/ Inst.f.Theoret.Astrophysik // / \\ \ koenig@tat.physik.uni-tuebingen.de ^^^^^ ^^^^^
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