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Re: Process priorities

On woensdag, september 18, 2002, at 04:06 , Scott Boone wrote:

I am interested in the answer to this very same question. I asked Apple-folk
at MWNYC, and they poo-poo'd me (the conference technique of sidestepping
your question by questioning how much YOU know). They basically tried to say
that Darwin was doing "more work" and that FreeBSD's top couldn't be
consuming so few cycles. Both are BS. This issue is of particular concern to
me because I use FreeBSD so frequently...and most of the processes on that
platform FEEL like they execute more quickly, dramatically more
quickly--doing so on hardware that shouldn't be (isn't) faster.

If you use "top -d" (or "top -ud"), Darwin's top won't consume that many cycles either (it's still slightly more than under the other OS'es though). It's the gathering of memory statistics that consumes so much time. On darwin-development, Apple engineers also always say this is because traversing the mach memory maps is a lot of work. Maybe the memory mapping under FreeBSD (and Linux) is in fact much simpler than under mach... Anyway, the source of all things involved is available, so nothing prevents you from finding out what the real cause is (except for time, probably :)


Jonas
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 >Re: Process priorities (From: Scott Boone <email@hidden>)



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