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Re: Process priorities

Subject: Re: Process priorities
From: Jonas Maebe <email@hidden>
Date: Tue, 17 Sep 2002 15:13:30 +0200

On dinsdag, september 17, 2002, at 02:51 , James Whitwell wrote:

I've noticed if I run 2 CPU-bound processes (for testing, 2 copies of
seti@home), leave one at the normal priority and nice 20 the other, the
nice'd process still consumes about 40% of CPU (this is with 'ps l' -- 'top'
shows about 20%). I thought that setting nice 20 would mean the process
would run only when nothing else was running -- is that right?

It's right under Linux and probably under most *nix OS'es, but not under Darwin (at least not under 5.x and below, I don't know whether this had been changed in 6.x). Under Darwin, priority 20 simply means "a very low priority" (which is still dynamically adjustable).

Jonas
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References:
	>Process priorities (From: James Whitwell <email@hidden>)

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