On 7/21/2012 11:09 AM, chris derham wrote:
...
1. Create a automated test script to simulate some load
2. You increase the load until the bring the webapp to its knees -
either>80% CPU or responses taking>1/2 sec to return
3. Critical step - you tell your bosses the maximum level that the app
can currently support, e.g. X concurrent users performing A and B and C
routes through the app.
4. If they say that's all they need, then stop
5. Otherwise use a profiler to establish where the bottle neck is
6. Fix it
7. Repeat from step 2
Using this technique you make sure that you don't waste time fixing issues
that aren't really issues. As a programmer, its kind of hurts to admit it,
but programmers are wrong when thy guess where the performance issues are.
Always. This isn't my idea - read the performance tuning books. You'll just
make code more complicated, and less maintainable.
I disagree here. Once in a great while (maybe 10% of the time), I think
I know where my bottlenecks are going to be, and testing proves me
right. Of course the other 90% of the time...
D
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