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 mysqld. 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. Alex
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