Presentation: Performance Beyond Throughput:An OpenJ9 Case Study

Track: Performance Mythbusting

Location: Bayview AB

Duration: 2:55pm - 3:45pm

Day of week: Monday

Level: Intermediate

Persona: Architect, Backend Developer, CTO/CIO/Leadership, Developer, Developer, JVM, DevOps Engineer, General Software, Technical Engineering Manager


Curious about Java application and JVM performance and how they are continuing to evolve? Come to this talk to learn more about exciting results and new advancements in the area of JVM performance using the latest open source JVM technology at Eclipse OpenJ9 running with OpenJDK! We'll talk about new performance boosts across a wide variety of applications and present results using different workloads and metrics to give you a fuller picture of what to expect from OpenJ9. We will also explore some common low-level Java performance problems and show how to look for these issues in an application. Low-level performance bottlenecks can be more challenging to diagnose since they can arise either from the OS kernel or from performance critical parts of the JVM such as the garbage collector (GC) or the just-in-time compiler (JIT). Rather than focusing on any single monitoring tool, we will explain the data you need to gather and provide you some examples of how to do so using system commands and profiling tools (like Linux Perf) as well as explaining different JVM tracing and logging capabilities. The view from “the bottom of the stack” can help in finding and fixing some stubborn performance problems often missed by high-level performance analysis tools.

Speaker: Marius Pirvu

Advisory Software Developer @IBM

Marius Pirvu is an Advisory Software Developer in the IBM Runtime Technologies Group. After receiving his Ph.D. degree in Computer Science from Texas A&M University in 2000 he joined HP where he designed the chipset architecture of next generation servers. For the last 14 years he has been working at the IBM Canada Lab on the design and implementation of Testarossa Just-In-Time compiler used in IBM’s J9 JVM (now Eclipse OpenJ9). His main focus is optimizing the JVM to improve start-up, ramp-up and footprint.

Find Marius Pirvu at

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