What are these processes doing?

Denys Vlasenko dvlasenk at redhat.com
Sun Jan 25 21:04:31 UTC 2009

On Fri, 2009-01-23 at 15:28 -0800, Ken Teague wrote:
> Ken Teague wrote:
> > I have two processes running on a Linux box that are consuming quite a
> > lot of CPU time.
> Scratch that.  After digging around a bit more, I found that these
> processes were waiting for I/O from other threads... just hanging out,
> drinking a beer and consuming a lot of (CPU) time.

I don't understand.

Waiting properly and consuming a lot of CPU time are different things.
Waiting processes should use no CPU at all, unless they are poorly coded
and wait for something by periodically polling: "did it happen?" "did it
happen?" "did it happen?"...

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