JVM performance: OpenJ9 uses least memory. GraalVM most. OpenJDK distributions differ.

In a previous blog post I created a setup to compare JVM performance of several JVMs. I received some valuable feedback on the measures I conducted and requests to add additional JVMs. In this second post I'll look at some more JVMs and I've added some measures like process memory usage and startup time. Also I've automated the test and reduced the complexity of the setup by removing haproxy and testing a single JVM at a time.

A first look at Splunk. Monitor Oracle SOA Suite service response times

Measuring performance of services can be done in various ways. In this blog I will describe a method of measuring Oracle SOA service response times with Splunk a popular monitoring tool. In order to monitor service response times with Splunk, Splunk needs to obtain its data from somewhere. In this example I'll use the HTTP access log which I expand with a time-taken field. Disclaimer; my experience with Splunk is something like 2 hours. This might also be an indication of what can quickly be achieved with Splunk with little knowledge.