Ruby On Rails is slow…?

Question

I\'m writing a web application to monitor a furniture factory production flow. It has thousand of data to handle. So far, I run RoR on Mongrel + MySQL and it\'s really really sl

Answer 1

I'll agree with everyone else. You have to profile. There is no point in doing anything to your code until you know what specifically is causing the slowness. Trying to fixing a problem without understanding the cause is like feeling ill and deciding to have lots of surgery until you feel better. Diagnose your problem first. It might be something small like a network setting or it could be one bad line in your code.

Some tips for profiling:

How to Profile Your Rails Application

Performance Testing Rails Applications

At the Forge - Profiling Rails Applications

Once you have found the bottleneck you can figure out what to do.

I recommend these videos: Railslab Scaling Rails

Revised now based on prof results:

OK. Now that you can see that your problem is that you are doing some sort of calculation using a query based on looping through the results of another active record query I'd advise you to look into building a custom SQL statement combining your initial selection criteria and the loop calculation to get what you need. You can definitely speed this up by optimizing the SQL.