Application Performance And Stress Testing?

Jul 29, 2010

I want to test application for stress, load and performance. Please guide me what free tools should be used for this ? Is there any tool which particularly can be used to analyse individual components, functions and scripts and resources they use ?

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Some more history as requested in the comments:

In the peak hours the sites gets around 20,000 visitors an hour.
The site is an webforms application with a lot of AJAX/POSTs
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Deadlocks (!syncblk only gives one lock)
Disk I/O (checked via sysinternals procesexplorer: 3.5 mB/s)
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CPU utilization 6%
Worker Thread: Total: 95 Running: 72 Idle: 23 MaxLimit: 200 MinLimit: 100
Work Request in Queue: 1
Number of Timers: 64

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CPU utilization 9%
Worker Thread: Total: 111 Running: 111 Idle: 0 MaxLimit: 200 MinLimit: 100
Work Request in Queue: 1589

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