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Re: [pcp] PCP JMX PMDA

To: Paul Smith <psmith@xxxxxxxxxx>
Subject: Re: [pcp] PCP JMX PMDA
From: Nathan Scott <nathans@xxxxxxxxxx>
Date: Thu, 24 Mar 2016 00:33:40 -0400 (EDT)
Cc: pcp developers <pcp@xxxxxxxxxxx>
Delivered-to: pcp@xxxxxxxxxxx
In-reply-to: <D9B89914-50FA-4847-9D57-12117B60949B@xxxxxxxxxx>
References: <56D8858A.3020407@xxxxxxxxxx> <56E05862.7040707@xxxxxxxxxx> <282702840.33546644.1458721199633.JavaMail.zimbra@xxxxxxxxxx> <D9B89914-50FA-4847-9D57-12117B60949B@xxxxxxxxxx>
Reply-to: Nathan Scott <nathans@xxxxxxxxxx>
Thread-index: DiAlwIor0Pq1EalGTX4Ym8kJQGE18Q==
Thread-topic: PCP JMX PMDA

----- Original Message -----
> [...]
> Stop-the-World-Make-Coffee-and-perhaps-have-some-biscuits; you get values,
> likely 'stale'.  In the GC paused state, not much is happening in the JVM
> _anyway_ so whatever values are available aren't likely to change much
> (other than the GC values themselves..)

Right - for all counter metrics (the best kind of metrics), those values are
still 100% correct.  IOW the right thing to do is for tools to report a zero
rate-of-change - which, happily, is exactly what happens.

cheers.

--
Nathan

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