Re: limiting CPU usage
Re: limiting CPU usage
- Subject: Re: limiting CPU usage
- From: "Shawn Erickson" <email@hidden>
- Date: Fri, 30 Nov 2007 12:30:52 -0800
On Nov 30, 2007 12:05 PM, Murat Konar <email@hidden> wrote:
>
> On Nov 30, 2007, at 8:36 AM, Alexander Cohen wrote:
>
> > In that case, maybe you have an idea for me. I have a daemon that
> > runs and indexes all the images on a system. For each image, it
> > needs to open it up, get some info, close it and store that info.
> > This is very CPU consuming and can pretty much bring the system to
> > a halt after a while.
>
> That doesn't seem right. Your daemon shouldn't be able to monopolize
> the CPU. Are you sure that's what's going on?
>
> I wonder if what is really happening is that you're memory usage is
> getting out of hand and causing virtual memory thrashing.
Likely because the image files he is processing are being loading into
the UBC (universal buffer cache) when they don't really need to be
(forcing user related items out of the cache).
man fcntl and look at F_NOCACHE
Review...
<http://developer.apple.com/documentation/Performance/Conceptual/FileSystem/Articles/FilePerformance.html#//apple_ref/doc/uid/20001987-99732>
-Shawn
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