[ale] Putting an arbitrary process to sleep

[James Kinney]

How 'bout a cron job? Every minute, test the temp/voltage/etc. If temp is
high, renice the high cpu offenders to 20 until the temp drops.

Of course, if you are having consistent heat problems, you need to address
the hardware side of the problem with more cooling. The system should be
able to dissipate all the heat it produces even when under 100% CPU load
24x7. The sensors are to warn of temp problems due to cooling system
failure. Throttling back cpu usage is a rather cludgy way to avoid another
noisy fan (or three).

JimK
Local Net Solutions

On Thu, 4 Jan 2001, Wandered Inn wrote:

> "Joseph A. Knapka" wrote:
> > 
> > Does anyone know of a command or system call that
> > one can issue to make an arbitrary process sleep
> > for a given amount of time? "[u]sleep" puts the current
> > process to sleep, but that's not what I need.
> > 
> > Rationale: I want to write a daemon that will monitor
> > CPU temp and put certain processes (Seti at home, etc)
> > to sleep for a while if it gets too high. Maybe
> > there's already something like this around? Or maybe
> > there's an easier way to accomplish the task that
> > someone can suggest?
> 
> The only way I can see to do this would be to have the processes you
> want to be able to make go to sleep look for a signal and when the
> signal is received, the process goes to sleep.  Since you probably don't
> want to modify a bunch of programs, you could write a wrapper program,
> or even a script that would do this.  I just threw together the
> following script I called 'sleepy':
> 
> trap 'echo I am tired; sleep 10' 16
> while :; do
>         date
>         sleep 2
> done
> 
> If you fire off this script, it writes the date out and sleeps.  If you
> send it a signal 16, it will print out 'I am tired', sleep 10 seconds
> and then resume.  Now this doesn't solve your problem completely as you
> couldn't just replace the 'date' with your programs.  What you might
> have to do is to kill the process you want to go to sleep, sleep the
> specified time, then fire the process up again.
> 
> Maybe someone will come up with a better solution?
> 
> 
> 
> 
> > 
> > Thanks,
> > 
> > -- Joe Knapka
> > --
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> 
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