CPU usage by sqls

Hi

Is there a way to get cpu utilization of various sql statements during a specific time period on postgresql ?

Say I start a performance test, I would like to collect a top sql report at the end of the test (like in sql server) that gives details of the top cpu consuming sqls..

Also wondering if there is a sql profiler on postgressql that indicates the number of rows read and written to by sql statements, cpu cost, elapsed time etc during a profiled session.

thanks,

thara.