Trick to low CPU usage?

[Jakob Bieling]

OT: Re: Trick to low CPU usage?

"Mike Smith" <mike_UNDERSCOR E_smith@acm.DOT .org> wrote in message
news:vr50pue06k rp9c@news.super news.com...[color=blue]
> Jakob Bieling wrote:[color=green]
> >
> > <Platform-Specific> On Windows you can use "Sleep" to have your[/color][/color]
process[color=blue][color=green]
> > sleep for n milliseconds. For other platforms I do not know.
> > </Platform-Specific>[/color]
>
> <more-platform-specific> Sleep() does not guarantee an exact time. If
> no other threads are ready to run, the Sleep()ing thread could
> conceivably resume immediately[/color]

It's right that it is not exact, but when you say 80ms, your thread is
going to sleep for at least 80ms - guaranteed. This is why I suggested
roughly 80-90ms for the timeout; the remaining 10-20ms are for executing
code and for the inaccuracies.

regards
--
jb

(replace y with x if you want to reply by e-mail)

[Frank Schmitt]

Re: Trick to low CPU usage?

Mike Smith <mike_UNDERSCOR E_smith@acm.DOT .org> writes:
[color=blue]
> Jakob Bieling wrote:[color=green]
> > <Platform-Specific> On Windows you can use "Sleep" to have your
> > process
> > sleep for n milliseconds. For other platforms I do not know.
> > </Platform-Specific>[/color]
>
> <more-platform-specific> Sleep() does not guarantee an exact time. If
> no other threads are ready to run, the Sleep()ing thread could
> conceivably resume immediately. A timer event might a the better way
> to go. Does a corresponding thingy exist in Linux?</m-p-s>[/color]

man nanosleep
man 3 usleep

HTH & kind regards
frank

--
Frank Schmitt
4SC AG phone: +49 89 700763-0
e-mail: frankNO DOT SPAMschmitt AT 4sc DOT com

[Eternally]

Re: Trick to low CPU usage?


"Eternally" <m@r.com> wrote in message
news:kokrb.2989 8$1N3.3032@twis ter.nyroc.rr.co m...[color=blue]
> Hey folks,
>
> I'm writing a simple C++ application which runs continuously. I'm running
> the program from the command line in Cygwin from XP, and it's
> cross-compatible with Linux.
>
> While running the program, I notice that the CPU usage is 100%, with my
> application stealing 97% of it.
>
> I'd like to bring that down to at most 10% of the CPU usage. What's the
> trick to that?
>
> I noticed that on certain applications like those used to decode video,[/color]
you[color=blue]
> can specify how much CPU to use (high priority, low priority...), how is
> that accomplished? How can I bring my applications CPU usage down to 10%?
>
> Note: I tried running sleep(1), and that brought it down below 10%,[/color]
however[color=blue]
> telling it to sleep for a full second is too much. A tenth of a second
> would be fine, but sleep only takes ints. I then tried using clock() and
> making it pause until a certain amount of time had passed like .005 of a
> second, but the cpu sticks at 100% with that method (since it's running in[/color]
a[color=blue]
> while loop testing the amount of time passed....i.e. it's not really
> sleeping).
>
> Thanks in advance for the help!
>
>[/color]

Thanks everyone! usleep did the trick!