Cloud Based Server-Side Load Testing

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Just recently we announced the release of our Server Metrics agent. A feature that makes it possible to gather internal data from your server.

To get started with Server Metrics, please check out this tutorial that will guide you through the installation and setup process.

When Load Impact runs a test, the test server will collect a wide array of externally measured data. By measuring the load target from our end, we can quite easily pick up and store data about clients active, response time, transactions per second – just to name a few. We present this data to you in our web UI online, exported in CSV file or via our API for further analysis.

But there are a lot of other measurements that most of our users need to have to be able to do a better analysis of the performance and that is exactly what Load Impact Server Metrics tries to solve.

Fig 1. Memory and CPU usage of the target system

By installing the Server Metrics Agent on one or more target systems, our load testing server can pick up some internal measurements during the test and add those to the same data set. Load Impact  supports collecting data from several different target machines during a test, so it’s possible to get internal measurements from a fairly complex setup as well. The advantage of this is quite obvious.

Even if it would be possible to log this data separately on the target machines, you would end up with the task of trying to synchronize the time stamps of the internally generated data series with the data from Load Impact. Even if that’s of course possible to do, it’s going to be a bit of a hassle that you can easily avoid.

Technically, the Server Metric Agent software is a Python based script that will run as a service/daemon  on your target systems. It will require Python 2.6 and a fairly common library called psutil. Both Python 2.6 and psutil are open source and will run on pretty much every operating system we know of.  We offer installers for 32 and 64 bit Debian based Linux distributions, including Ubuntu, as well as for 64-bit Windows Server 2008 R2 and 2012.  For other systems, we offer the Python source code for download. Also note that in order to connect a Server Metric Agent installation to your, and only your, Load Impact account, you are required to generate a Server Metric token on your account settings page.

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