Profiling tools?

I am using Django 1.3.1

I want to know in my application how much time is taken by a) database access b) creation of XML c) other parts of code. What would be some good tools to profile my application?

The code to be profiled is in django view and uses Django ORM and Python 2.6 and lxml to generate XML. It is called from AJAX request and returns XML.

Please recommend both open source and commercial tools.

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