Simulating Different-Network Speeds using JMETER
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The document discusses the importance of testing mobile app performance given the rise of mobile usage. It notes that mobile users have varying internet speeds depending on their location and network. It then provides instructions on how to configure JMeter to throttle bandwidth and simulate different network speeds when load testing a mobile app. This allows for more realistic performance testing of how an app might perform for mobile users on cellular networks.
Simulating Different-Network Speeds using JMETER
- 2. In the current digital world mobile app usage has overtaken desktop traffic - and this trend just looks set to rise. But what does this mean for us? For performance engineers, it means that now, more than ever, we need to focus on mobile users when running performance tests. If our mobile app doesn’t perform well - our business will be at stake.
- 3. In most of the cases, mobile device users access the internet via the cellular network. The network coverage will vary depending on the location. Hence it is very critical to ensure that the system can fully handle mobile and tablets - even when they have different internet connection speeds. By default, Jmeter will send the requests to the target server as fast as it can. This is great for generating the load on the server - but not very realistic as real users don’t hit the server non-stop, they will have some time to think between operations. On top of that, mobile users are limited by network bandwidth, which can slow them down considerably.
- 4. Option to throttle outgoing bandwidth in order to simulate different network speeds Bandwidth can be controlled through these two properties: ◦ httpclient.socket.http.cps=0 ◦ httpclient.socket.https.cps=0 “cps” stands for “characters per second” The properties default to zero, which means no limitations The formula for calculating “cps” For example: to emulate the GPRS cellular network speed (which is 171 Kbits/second downstream), the relevant CPS value would be: 21888 (171 * 1024/8) cps = (target bandwidth in kbps * 1024) / 8
- 5. 1. Add these two lines to the user.properties file (you’ll find this in the bin folder of your JMeter installation) ◦ httpclient.socket.http.cps=21888 httpclient.socket.https.cps=21888 ◦ You’ll need to restart Jmeter to pick these properties up 2. Alternatively, you can pass the properties’ values via the -J command line argument, like this: ◦ jmeter -Jhttpclient.socket.http.cps=21888 - Jhttpclient.socket.https.cps=21888 -t /path/to/your/testplan.jmx