Lin Hu
Staff Software Developer at IBM
Ottawa, Ontario, Canada
Summary
🤩
Rockstar🎓
Top SchoolLin Hu is a Staff Software Developer with over 15 years of experience building and optimizing complex systems, currently at IBM in Ottawa. He brings deep language expertise in C, C++ and Java, strong design-pattern discipline, and a track record across embedded, client-server, mobile and web platforms. Lin has contributed to high-profile open-source JVM projects (Eclipse OMR and OpenJ9), where his work improved garbage collection, memory management and reference processing to reduce runtime footprint and boost stability. Comfortable leading or working hands-on, he pairs rigorous troubleshooting with cross-platform systems knowledge spanning Unix, Windows and macOS. Collected from years in telecom and enterprise environments, his practical focus on low-overhead runtime improvements distinguishes his engineering approach.
10 years of coding experience
12 years of employment as a software developer
Bachelor of Computer Science (BS), Bachelor of Computer Science (BS) at Beijing University of Technology
Github Skills (15)
memory-management10
javas10
jna10
g10
jvm10
performance-optimization10
omr10
garbage10
collector10
java10
runtime-environment10
garbage-collection10
concurrency9
cprogramming-language9
c-language9
Programming languages (4)
Github contributions (5)
eclipse-omr/omr
May 2016 - Sep 2022
Eclipse OMR™ Cross platform components for building reliable, high performance language runtimes
Role in this project:
Back-end Developer
Back-end DeveloperContributions:22 reviews, 55 commits, 75 PRs in 6 years 5 months
Contributions summary:Lin primarily contributed to the Eclipse OMR project by optimizing the garbage collection (GC) components. Their work involved reducing the initial native footprint of the scanCache, adding a new public API for accessing the ratio of LOA (Large Object Area), updating overflow states, and preparing for reporting macro fragmentation. The user also fixed an issue related to a missing memory element and added new methods to support an arbitrarily low-overhead garbage collector.
jitruntimesomrruntimeportability
eclipse-openj9/openj9
Sep 2017 - Jan 2023
Eclipse OpenJ9: A Java Virtual Machine for OpenJDK that's optimized for small footprint, fast start-up, and high throughput. Builds on Eclipse OMR (https://github.com/eclipse/omr) and combines with the Extensions for OpenJDK for OpenJ9 repo.
Role in this project:Back-end Developer
Back-end DeveloperContributions:83 reviews, 81 commits, 162 PRs in 5 years 4 months
Contributions summary:Lin primarily contributed to the Eclipse OpenJ9 JVM, focusing on improvements and enhancements within the Java runtime environment. Their work involved modifying the `MemoryPoolMXBean` javadoc for common behavior changes and implementing `Reference.waitForReferenceProcessing()` to improve performance. They also addressed several bugs and made improvements to memory management, particularly concerning Garbage Collection. These changes indicate a focus on enhancing the JVM's stability and performance, specifically in garbage collection and reference handling.
runtimecompilerextensionseclipseomr
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