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Re: Generic Monitoring Framework Proposal

From: Chris Browne <cbbrowne(at)acm(dot)org>
To: pgsql-hackers(at)postgresql(dot)org
Subject: Re: Generic Monitoring Framework Proposal
Date: 2006-06-19 21:14:15
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-hackers
Robert(dot)Lor(at)Sun(dot)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")
"...while   I   know  many   people   who   emphatically  believe   in
reincarnation, I have  never met or read one  who could satisfactorily
explain population growth." -- Spider Robinson

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