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Re: [pcp] [resend] Derived Metrics - RFC

To: kenj@xxxxxxxxxxxxxxxx
Subject: Re: [pcp] [resend] Derived Metrics - RFC
From: Max Matveev <makc@xxxxxxxxx>
Date: Fri, 6 Nov 2009 00:15:06 +1100
Cc: pcp@xxxxxxxxxxx
In-reply-to: <1257384538.4706.76.camel@xxxxxxxxxxxxxxxx>
References: <1257384538.4706.76.camel@xxxxxxxxxxxxxxxx>
On Thu, 05 Nov 2009 12:28:58 +1100, Ken McDonell wrote:

 kenj> The most common examples are ...
 kenj>       * the requirement to compute something that is "delta(value) /
 kenj>         delta(other_value)", e.g. average time per message where both
 kenj>         "time" and "number of messages" are counters
 kenj>       * aggregation of existing metrics, e.g. "messages" being the sum
 kenj>         of synchronous and asynchrous message sent and received, or
 kenj>         total packet rate across all gigE interfaces
Do you have any plans to support "avergage of last 10 samples" thing
or rates? Or is it just the metrics from a single pmfetch?

 kenj>         As an aside does any know of a living user of these asynchronous
 kenj>         interface extensions to the original PMAPI?
Yes, I do - when collecting metrics from multiple hosts I cannot
afford for TCP to pick its nose when one of the hosts go down.

max

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