Hi, awesome work Claus :) Just to add that you can do a lot with just VisualVM (bundled with JDK), or if you run Oracle JDK Mission Control/Java Flight Recorder which does not require a license when used in development[1].
And let me throw a few things into the mix: there is a great tool for finding leaked file handles[2]; and one potential performance gain we can work on is using java.nio.file.Files.newInputStream/newOutputStream instead of FileInputStream/FileOutputStream as demonstrated by Hadoop[3]. zoran [1] http://www.oracle.com/technetwork/java/javase/terms/license/index.html [2] http://file-leak-detector.kohsuke.org/ [3] https://issues.apache.org/jira/browse/HDFS-8562 On Fri, May 26, 2017 at 3:59 PM, Claus Ibsen <claus.ib...@gmail.com> wrote: > Hi > > We have found a few spots to optimize the camel-core source code for > thread contention and something else. > > You can use a profile tool such as YourKit which is excellent at > identifying spots and visualizing what goes on in the JVM. > > We have used it in the past to optimise stuff. However recently Luca > asked about making Camel startup faster: > https://issues.apache.org/jira/browse/CAMEL-11321 > > And although fast startup is not excatly the same as runtime > performance then they are still related. A profile can help identify > places for improvements. > > I have pushed a sample project at > https://github.com/davsclaus/camel-profile-sample > > You can then run this via > > mvn spring-boot:run > > And then attach YourKit profiler. > > However if you use IDEA then you can start YourKit, then from YourKit > you can choose Integrate with IDE ... and then chose IDEA and then say > ok even if IDEA is also running. > > In IDEA you should see a YourKit icon if you right-click on the > SampleCamelApplication to run this application, then you can chose > that to profile, and it run the app with profiler. > > You then switch to YourKit and you should start see data. > To check for thread contention, then select the "Monitor Usage" tab, > and then click the gear button with the play icon "Start Monitor > Profile" which then starts capture data. > > For YourKit you can request a trial license that works for 2 weeks. > > > -- > Claus Ibsen > ----------------- > http://davsclaus.com @davsclaus > Camel in Action 2: https://www.manning.com/ibsen2 -- Zoran Regvart
