TomcatExpert

Factors to consider in determining number of concurrent instances for your hardware

posted by SpringSource on April 16, 2010 06:20 AM

Determining the best configuration for concurrency is dependent upon the application running on Tomcat.

Because every application is so different, there are no general guidelines for how many instances you setup on different kinds of hardware, but there is a way to determine how your application will best run on your given hardware.

To determine what is the best config:

1. You need some sort of load test or measurement of performance
2. Start out with one instance, the reason for this is simplicity. Have this instance setup with maxThreads="400"
3. Run the load test

At this point, you'll get a sense for what the application is doing. Repeat the process with threads counts of 50, 200 and 800. Most applications do a bit better with lower counts.

Lets say that 50 gives you some good performance, then you can scale up the number of instances to 2,3 or 4.
You'd only scale up the instances if you have more CPU resources available.

The goal is always to have the least amount of instances running, simply cause its easier to manage, monitor, troubleshoot and all the other good stuff. However, not all applications handle concurrency very well. In that case, you should lower the thread counts and increase the instance number

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My hardware knows how to make your homework fun. I can't even study. I thought that something has broken, but technical engineer said the device is working appropriately and I should check all applications on it. I will definitely reconsider the applications installed that slow down the work of my PC.

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