Understanding Iago metrics- is the content of parrot-server-stats.log per time bin or commulative?

[Julian Rendell]

Hi-

I noticed that the content of parrot-server-stats.log was not monotonically increasing from entry-to-entry for custom stats I am collecting.

Which had me greatly confused when comparing to the stats summary shown in Ostrich.

I then realised, and confirmed for one stat, that the adding up each of the entries in parrot-server-stats.log added up to the same value as appeared in the Ostrich stats at the end of the test run, or the output of println(Stats.get()) that I added to the shutdown method of my load test.

I'd just like to confirm that this assumption is correct: the parrot-server-stats.log entries are for each time interval, for all stats, where as the Ostrich summary at the end is the final accumulation across the entire load test.

Thanks!

Julian

[James Waldrop]

correct. In general we care about the time intervals, not the aggregates, but YMMV.

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[Julian Rendell]

Doh- hit the wrong "reply" - replying to the group this time-

Great! 

I was just confused by seeing different values for the same thing, in different places. It makes sense now :)

At the very worst, I'll have to review the basic rules of statistics.

Cheers,

Julian