0pg / jvm-perf

Materials for a workshop on JVM performance optimization

Overview

The JVM is a rock-solid, battle-proven platform for developing and deploying applications. Thousands of engineering years have been invested into the facilities available on it, resulting in sophisticated garbage collection and just-in-time compilation mechanisms. The interaction between this platform and our applications is nuanced and often misunderstood.

In this 5-day workshop, the participants will learn about the two major runtime mechanisms of the JVM affecting performance - the JIT compiler and the garbage collector; techniques for writing performant JVM code and effective use of tools for analyzing performance.

Who Should Attend

Engineers, SREs and tech leads responsible for production JVM applications.

Prerequisites

Basic knowledge of the JVM; basic experience running JVM applications in production.

Topics

• Overview of the JVM
• Garbage collection on the JVM
• Types of garbage collectors and choosing a garbage collector for a workload
• Analyzing allocations in JVM code
• Writing JVM code that is lean on allocations
• Analyzing bytecode to pinpoint allocations
• Monitoring garbage collector performance at runtime
• Understanding JIT compilation on the JVM
• Benchmarking code using JMH
• Analyzing JIT behaviour at runtime
• Writing JIT-friendly JVM code

Daily Structure

5 days, 4 hours a day starting.

Attendance

Attendance at this workshop is fully remote. Attendees will be provided with a link to a remote meeting session the day before the event, in which they can see and hear the workshop, ask the instructor questions, and chat with other attendees.

Usage

From the UI

1. Download the repository as a zip archive.
2. Unzip the archive, usually by double-clicking on the file.
3. Configure the source code files in the IDE or text editor of your choice.

From the Command Line

1. Open up a terminal window.

2. Clone the repository.

   git clone https://github.com/jdegoes/jvm-perf

3. Launch project provided sbt.

   cd jvm-perf; ./sbt

4. Enter continuous compilation mode.

   sbt:jvm-perf> ~ test:compile

Hint: You might get the following error when starting sbt:

[error] typesafe-ivy-releases: unable to get resource for com.geirsson#sbt-scalafmt;1.6.0-RC4: res=https://repo.typesafe.com/typesafe/ivy-releases/com.geirsson/sbt-scalafmt/1.6.0-RC4/jars/sbt-scalafmt.jar: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested targe

It's because you have an outdated Java version, missing some newer certificates. Install a newer Java version, e.g. using Jabba, a Java version manager. See Stackoverflow for more details about the error.

Legal

Copyright© 2023 John A. De Goes. All rights reserved.