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Re:Post mortem of a failed HackerNews launch by chacham15 on Thursday November 29, 2012 @10:54AM (#4848340)
Is there a way to run simulated traffic to determine how your server will react based upon heavier load to try and determine how many people it can serve?
Re:Post mortem of a failed HackerNews launch by gingerjoos on Thursday November 29, 2012 @11:34AM (#4848571)
Yes, there are. A previous comment by TeeWEE [1] mentions 2 tools. There are others as well - Siege [2] and Apache Bench [3] come to mind.

[1] http://news.ycombinator.com/item?id=4847949 [2] http://www.joedog.org/siege-home/ [3] http://httpd.apache.org/docs/2.2/programs/ab.html

Re:Post mortem of a failed HackerNews launch by pearkes on Thursday November 29, 2012 @11:42AM (#4848612)
Blitz is also worth a mention.

http://www.blitz.io/

Re:Post mortem of a failed HackerNews launch by ohashi on Thursday November 29, 2012 @12:24PM (#4848900)
Can also connect newrelic with it and get stack traces logging how much time each component of your app is taking including DB queries.
Re:Post mortem of a failed HackerNews launch by druiid on Friday November 30, 2012 @01:59AM (#4852184)
Blitz is good, but I've found the way to build test-cases fairly limiting. I've used http://www.loadimpact.com to good success.

Addendum: Oh, load impact is pricey though.