Mark Stoodley
Senior Technical Staff Member at IBM
Markham, Ontario, Canada
Summary
🤩
Rockstar🎓
Top SchoolMark Stoodley is a Senior Technical Staff Member and long-time compiler engineer who has led the Eclipse OMR and OpenJ9 projects at IBM, bringing deep expertise in JIT compilers since 2002. He combines hands-on system and backend architecture work—contributing core OMR features and JVM optimizations—with leadership as technical lead for OpenJ9 and OMR. His contributions span low-level, performance-critical fixes (e.g., control-flow primitives, address arithmetic, and JVM flag handling for Elasticsearch compatibility) that reflect a strong command of compiler internals and runtime engineering. Holding advanced degrees from the University of Toronto, he pairs rigorous academic training with decades of production experience shipping high-performance language runtimes. An inventor of the JitBuilder library, he’s comfortable moving between tactical debugging and broad architectural decisions that materially improve runtime performance and compatibility.
10 years of coding experience
18 years of employment as a software developer
Ph.D., Ph.D. at University of Toronto
Stackoverflow
71reputation
20kreached
1answer
0questions
Github Skills (23)
debug10
c-language10
jvm10
runtimes10
architecture10
virtual-machine10
java10
javas10
system10
low-level-programming10
compiler-design10
compiler-compiler10
performance-optimization10
compiler10
architectures10
Programming languages (16)
Github contributions (5)
eclipse-omr/omr
Mar 2016 - Nov 2022
Eclipse OMR™ Cross platform components for building reliable, high performance language runtimes
Role in this project:
Back-end Developer & System Architect
Back-end Developer & System ArchitectContributions:1 release, 77 reviews, 362 commits in 6 years 9 months
Contributions summary:Mark contributed to the Eclipse OMR project by addressing compiler warnings and enhancing core functionalities. Their work included converting shifts of negative constants and improving the handling of integer subtractions from addresses. They added features like the virtual machine's control flow capabilities by adding IfAnd and IfOr along with addressing code quality improvements. The contributions suggest a strong understanding of compiler internals and system-level programming.
jitruntimesomrruntimeportability
eclipse-openj9/openj9
Sep 2017 - Sep 2021
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:72 reviews, 56 commits, 55 PRs in 4 years
Contributions summary:Mark contributed to the OpenJ9 JVM project by addressing several optimization and debugging issues. Their work included removing unnecessary calls in the compiler, refactoring tracing statements, and removing unused code. Furthermore, the user implemented a tactical solution to print the -XX:+PrintFlagsFinal output, specifically targeting the MaxHeapSize and MaxDirectMemorySize flags for elasticsearch compatibility. These changes indicate a focus on improving the JVM's performance, debugging capabilities, and compatibility with other software.
runtimecompilerextensionseclipseomr
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