Douglas Hawkins
Lead Developer Java Performance Monitoring at Datadog
Douglas Hawkins has been passionately developing software for the past 20 years.Throughout Doug's career, he has focused on creating performance intensive applications
in Java ranging from bioinformatics to financial exchanges.
After 10 years as a Java developer, Doug transitioned to working on Azul's Java Virtual Machine.
Today, Doug continues his interest in building performance tools for developers working on Datadog's Java Application Performance Monitoring.
While Doug's passion for developing software remains, his true passion is in sharing his
interest in low-level details and JVM performance with others.
Presentations
Java Performance Puzzlers
8:30 AM MDT
Everyone worries about performance but few of us have the time to truly understand it. Fortunately, our modern JVMs and CPUs are capable of some amazing performance tricks, but those same tricks only make reasoning about performance that much harder.
In this talk, we'll take a look at some surprising and often unintuitive performance problems and solutions. Not simply with the goal of memorizing solutions but also to better understand the complexity that lies inside both JVMs and CPUs.
Java Performance Puzzlers - Part 2
10:30 AM MDT
Everyone worries about performance but few of us have the time to truly understand it. Fortunately, our modern JVMs and CPUs are capable of some amazing performance tricks, but those same tricks only make reasoning about performance that much harder.
In this talk, we'll take a look at some surprising and often unintuitive performance problems and solutions. But not simply with the goal of memorizing solutions, but to better understand the complexity that lies inside both JVMs and CPUs.
How (Not) To Measure and Profile Java Performance
1:00 PM MDT
Today, we all benefit from the sophistication of modern compilers and hardware, but that extra complexity can also make it difficult to reason about performance.
In this talk, we'll examine some surprising performance cases and learn how to
use profiling and benchmarking tools to better understand our modern execution environments.
Concurrency Concepts in Java
2:45 PM MDT
Unlike other languages, Java had a well-defined memory model from the very beginning, but over the years additional packages and low-level features have been added to make the most of today's hardware.
In this talk, we'll discuss concurrency in detail starting at the hardware up to Java's latest synchronization mechanisms and finally onto high-level concurrent collections.
This talk will cover hardware memory fences, Java's synchronized and volatile, Atomic classes, newer capabilities added by VarHandles, and some select high-level concurrent collections.
Architecting with Garbage Collection in Mind
4:30 PM MDT
HotSpot provides a variety of garbage collectors with a variety of strengths and weaknesses. To get the most out of our applications, we need to pick the right garbage collector and design to take advantage of its strengths and avoid its
weaknesses.
In this presentation, you'll learn about criteria for picking a garbage collector, how to measure GC performance, and how to write code that works with rather than against the GC.