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Re: Creating a correct and real benchmark

From: Chris <dmagick(at)gmail(dot)com>
To: Marcos <mjs_ops(at)gmx(dot)net>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: Creating a correct and real benchmark
Date: 2006-02-21 00:21:52
Message-ID: 43FA5D20.2080805@gmail.com (view raw or flat)
Thread:
Lists: pgsql-performance
PFC wrote:
> 
>> 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.

The other advice on top of this is don't just import a small amount of data.

If your application is going to end up with 200,000 rows - then test 
with 200,000 rows or more so you know exactly how it will handle under 
"production" conditions.

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Subject: Cost Issue - How do I force a Hash Join
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