Changing the nice() value of a running process.
Leo de Wit
leo at philmds.UUCP
Thu Jan 26 04:13:01 AEST 1989
In article <8818 at alice.UUCP> debra at alice.UUCP () writes:
[]
|If all processes run at the same lowered priority the scheduling should
|remain the same. What you did however had 2 effects:
|1) The database program runs at a lower priority than your user interface
| which means that the user interface will respond better. This explains
| why the cursor is no longer hesitating.
|2) It looks like you are running the program from a shell script. The
| "nice" command is not build in (in the bourne shell), which means you
| are now invoking twice as many processes, which aren't doing much, but
| the nice process sits waiting for the database program to finish.
If nice was implemented to wait for a child to terminate, this would be
the case. But this wouldn't be a nice implementation of nice (8-), since
all it has to do is lower the priority, then execve() its own (shifted)
arguments. On Ultrix:
$ nice -10 ps gx
PID TT STAT TIME COMMAND
4766 ia TW 0:43 rn
5914 ia R N 0:01 ps gx
17932 ia S 0:18 esh
$
No sign of a waiting nice process...
Leo.
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