[Mongrel] Threshold of mongrel node processes

Alexey Verkhovsky alexey.verkhovsky at gmail.com
Tue Feb 27 08:45:29 EST 2007

> 1) Is this normal behavior for mongrel?
Not really.

First of all, it's hardly about Mongrel, which is rather light on CPU time.
More likely than not 95 out of those 98% CPU spends within your app code
(that runs on the same ruby process as Mongrel).

Normal CPU utilization profile includes significant amount of database work
(30 to 70%). Unless your Rails app uses SQLite (an in process database), or
doesn't use database at all, you should see some CPU (20 to 70%) utilized by

Make sure that you did change Rails environment to production with -e
production option.

> 2) Is there way to configure mongrel to only go after a threshold or
percentage of max cpu utilization?
No, not within Mongrel. You shouldn't need it.

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