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[Bug 1376857] poor pmlogconf performance, esp. with derived metrics

To: pcp@xxxxxxxxxxx
Subject: [Bug 1376857] poor pmlogconf performance, esp. with derived metrics
From: bugzilla@xxxxxxxxxx
Date: Mon, 19 Sep 2016 04:28:44 +0000
Auto-submitted: auto-generated
Delivered-to: pcp@xxxxxxxxxxx
In-reply-to: <bug-1376857-355098@xxxxxxxxxxxxxxxxxxx>
References: <bug-1376857-355098@xxxxxxxxxxxxxxxxxxx>
https://bugzilla.redhat.com/show_bug.cgi?id=1376857



--- Comment #1 from Mark Goodwin <mgoodwin@xxxxxxxxxx> ---

That patch looks good to me and is basically the agreed solution as discussed
http://www.pcp.io/pipermail/pcp/2016-May/010545.html i.e. turn off derived
metrics in pmlogconf by setting PCP_DERIVED_CONFIG to an empty string, along
with suitable man page updates. Not sure if we'd still want to honor
PCP_DERIVED_CONFIG if it is already set to something (as opposed to not being
set) ??

>
> But really it should be rewritten in python or something.

I don't see how reimplementing pmlogconf in another language will reduce the
probe overheads - we'd still have the same number of probes being called, which
is surely where most of the time is being spent. But the above patch should
help.

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