Re: Creating a correct and real benchmark

> I'm developing a search engine using the postgresql's databas. I've
> already doing some tunnings looking increase the perform.
>
> Now, I'd like of do a realistic test of perfom with number X of queries
> for know the performance with many queries.
>
> What the corret way to do this?


	I guess the only way to know how it will perform with your own  
application is to benchmark it with queries coming from your own  
application. You can create a test suite with a number of typical queries  
and use your favourite scripting language to spawn a number of threads and  
hammer the database. I find it interesting to measure the responsiveness  
of the server while torturing it, simply by measuring the time it takes to  
respond to a simple query and graphing it. Also you should not have N  
threads issue the exact same queries, because then you will hit a too  
small dataset. Introduce some randomness in the testing, for instance.  
Benchmarking from another machine makes sure the test client's CPU usage  
is not a part of the problem.