[Orca-users] working with mixed-column data sources...

[Cockcroft, Adrian]

Its not really that different to an http access log, you should
summarize on a longer time interval, 5 minutes at least, and sum up all
the activity in each interval. In orca log files, each line is the
average activity in the interval ending at that time. In most cases
normalized to per-seconnd rates.
You would start with the number of invocations of your app in that
interval, then add up all the other metrics in whatever way makes most
sense to you.

Adrian

-----Original Message-----
From: Attila Mezei-Horvati [mailto:attila_mh at yahoo.com] 
Sent: Tuesday, February 07, 2006 1:35 PM
To: Cockcroft, Adrian
Cc: orca-users at orcaware.com
Subject: RE: [Orca-users] working with mixed-column data sources...

Thanks for the reply. I like the article and plan on
checking the others, too. 

My problem however is a little different. I am trying
to monitor the performance of a web application on the
server. It is called only from time to time, so I do
have complete metrics (timestamp, startup time,
communication with the network, operations, total
duration) but I don't have it layed out based on a
specific interval. Sometimes I have an entry at 5
seconds, sometimes I have it after two three hours. I
can set the interval to 5 seconds but then what should
I use for the non-existing timestamps? I cannot put 0
since that would alter my statistics, make it look
like everything was alright (bringing down the total
avg, too).

Attila

--- "Cockcroft, Adrian" <acockcroft at ebay.com> wrote:

> 
> The original idea for the file format was to have
> collated performance
> metrics using a single timestamp, rather than trying
> to merge lots of
> unsynchronized **stat tools output. The original
> name was percolator,
> before Blair made it into orcallator and built the
> display components.
> See
> 
> http://www.itworld.com/AppDev/1609/UIR960301perf/
> for the original
> description and
>
http://perfcap.blogspot.com/2005/10/sunworld-columns-at-itworld.html
> for
> a list of info on similar topics.
> 
> So the ideal way to include a new metric is to add a
> column for it and
> report it at the same frequency as everything else.
> You can convert
> another logfile by counting its event rate, the same
> way as http access
> logs are summarized into orca.
> 
> Adrian
> 


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