Re: Generic Monitoring Framework Proposal

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От Chris Browne
Тема Re: Generic Monitoring Framework Proposal
Дата
Msg-id 60k67cyhjs.fsf@dba2.int.libertyrms.com
обсуждение исходный текст
Ответ на Generic Monitoring Framework Proposal  (Robert Lor <Robert.Lor@Sun.COM>)
Ответы Re: Generic Monitoring Framework Proposal  (Martijn van Oosterhout <kleptog@svana.org>)
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Robert.Lor@Sun.COM (Robert Lor) writes:
> For DTrace, probes can be enabled using a D script. When the probes
> are not enabled, there is absolutely no performance hit whatsoever.

That seems inconceivable.

In order to have a way of deciding whether or not the probes are
enabled, there has *got* to be at least one instruction executed, and
that can't be costless.
-- 
output = reverse("gro.mca" "@" "enworbbc")
http://www.ntlug.org/~cbbrowne/wp.html
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reincarnation, I have  never met or read one  who could satisfactorily
explain population growth." -- Spider Robinson


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