z3c.requestlet 0.9

Introduction

Log and show ram usage of a zope instance per request.

By calling @@requestlet, you’ll get a nice graph and (if you mark something in it) a table with ram usage, difference to the last request and the URI over time.

This product was created in the hope to see patterns on which requests how much ram is “lost”. It was inspired by http://code.google.com/p/zope-memory-readings/ and uses the graph-code from there.

The logging was taken from seletz’ requestlet code and was extended by the ram usage.

Installation / Usage

Add this to your buildout.cfg

[buildout] eggs = z3c.requestlet

[instance] zcml = z3c.requestlet

Then install the product using plone’s portal_quickinstaller. If the product is not installed, it will not log and it won’t provide the @@requestlet view.

After installation you may call

http://yoursite/@@requestlet

The default logfile is /tmp/requestlet.txt and may be set using an environment variable called “REQUESTLET_LOGNAME”.

You may also log only hits that take more than a specific time to render using an environment variable called “MIN_LOG_TIME”.

The logfile will provide detailled page generation information like this:

2009-07-01 16:21:39,755 requestlet INFO ELAPSED 0.038s (min 0s) METHOD GET RAM 423124kB URL: localhost:10054/site/++resource++z3c.requestlet.data/layout.css rinfo: last-modified=’Wed, 01 Jul 2009 12:51:28 GMT’ content-length=’169’ content-type=’text/css; charset=utf-8’ cache-control=’public,max-age=86400’

This provides:

• time to render the page in plone (ELAPSED)

• request method (METHOD)

• total vmsize of the zope process (RAM)

• the called URL (URL)

• the request info (rinfo)

Compatibility

This product will only work with systems, where you can get the memory-info from /proc/<pid>/status. This is linux.

Contribution

To contribute, feel free to send patches as we don’t have this in a public svn currently. It’s managed with bzr ;)

Authors

• Daniel Kraft <dk@d9t.de>

• Stefan Eletzhofer <info@inquant.de>

Changelog

0.9 - Initial useful release [20090107] [Daniel Kraft, Stefan Eletzhofer]

• view ram usage per request