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I've deployed a ruby on rails website to a ec2 micro instance. Can someone give some input on how much this instance can "handle" (e.g. number of users and/or transactions per second, etc.)


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up vote 4 down vote accepted

Not much.

Here's a great paper that describes how a micro's performance compared to a Nokia N900 smart phone.

The NET was that micros are very low end and can give irregular performance results.

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It depends heavily on what your application does, there's no fix number! Of course it'll be more limited on CPU time and memory than a bigger instance, but your only shot at getting a coherent number is to run a stress test.

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See if you can get another EC2 instance and get the two to communicate to each other over non-public interfaces. Then, run Siege against it and see how it performs as you adjust your application or web server settings.

Here's a Siege command I use: siege -c 10 -b -t 90s >/dev/null

This will simulate 10 concurrent connections repeatedly for 90 seconds.

You can also try ab, which ships with Apache: ab -c 100 -n 20000

This will use 100 concurrent connections for a total of 20000 page views.

Siege is preferred and is more powerful, but ab is easy to use and already on most systems.

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