> 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 ^^^^^ ^^^^^