[Melbourne-pm] Monitoring Starman apps

Toby Corkindale toby.corkindale at strategicdata.com.au
Tue Mar 13 23:59:20 PDT 2012

Starman, a Plack webserver, is configured to have a certain number of 
worker children, which it forks. You may be familiar with the concept 
from using Apache and configuring it to have a min/max of workers? Well, 
on Starman it's fixed. (Which is probably better, as you're not going to 
get into situations where the number of workers spirals out of control 
due to lengthening request durations due to larger numbers of workers.)

Anyway.. I want to have some way to measure how many processes are 
active at once, so I can tell when we're getting close to saturating the 
current number of workers.

I could hack up a script that runs regularly, and counts the number of 
established connections to port 8080 or whatever, but.. surely this kind 
of thing has already been done?

Any words of wisdom from the crowd?


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