How to do load/traffic testing for a website?

I have a website now I want to do a load testing to assess how much traffic it can handle. How can I achieve it?
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Muhammad BurhanManager I.T.Commented: and both are for simulating traffic load to a web
a nice other one:

the better thing is to use something like
 JMeter , or Selenium Can be a bit hard to learn and configure, but it's usually worth it.

Although Selenium as an automated test tool will run quite fast, making a mini stress test. If you put the same automation running on a couple of computers on your network at the same time you'll be able to see how it behaves.

If you want to record response timings, they have a cool api you can use to write some scripts to run your automations.

Selenium is quite easy to use, and it does asserts to page contents if you want to test the contents. It also copies your movement through the page if you wish (this would be my suggestion) just navigate the page a lot, and then save it for automation. Avoid putting asserts so selenium might run faster.
Lucas BishopClick TrackerCommented:
You can use Apache Benchmark. It's built into Apache.

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