Java Concurrency Troubleshooting: Latency and Throughput

Learn how to identify, prevent, and solve latency issues in a multithreaded Java application.

Introduction

• Welcome to high-performing Java applications
• So your Java application is slow
• Troubleshooting latency vs. throughput
• Parallelism vs. concurrency

1. Identify Sources of Blocked Threads

• Synchronization and locking
• Garbage collection
• Resource chokepoints and long-running operations
• Bad component defaults
• Java stream issues

2. Troubleshoot Blocked Threads

• Find the source of a blockage
• Collect thread dumps
• Challenge: Find the sleeping method
• Solution: Find the sleeping method
• Identify blocked threads in thread dumps
• View blocked threads with Java Mission Control
• View blocked threads with Java Flight Recorder
• Microbenchmarks in Java with JMH
• Challenge: Run JMH benchmarks and compare
• Solution: Run JMH benchmarks and compare

Conclusion

• Conquer your threads