Amit Kumar Email & Phone Number

Bengaluru, Karnataka, India

I am embarking on my journey as a Lead Developer for OpenJDK s390 Port Project. Here are few of my Individual contributions: * Added Port for JEP 475: Late Barrier Expansion for G1 Garbage Collector* Implemented Recursive Object Locking for C2 Compiler.* Improved Profiled Data collection for heavily Polluted Profiles. * Added fast path check in Thread Initialiser to avoid repeated interpreter calls for classes being initialised.* Added Port for Relocation of Field Information out of the Constant Pool Cache.* Added Port for Relocation of Method Resolution Information out of the Constant Pool Cache.* Restructured representation of whole Register class to use Values instead of pointers.* Added port for issue of frequent updates in the secondary_super_cache, as multiple threads attempting regular updates.

Bengaluru, Karnataka, India

As OpenJDK Contributor specializing in the IBM-s390 Port and Hotspot (Runtime) component, actively involved in the development and improvement of the project. Here are some key highlights of my contributions:* Successfully Fixed multiple broken builds across various debug levels* Finished the porting of new standalone functionalities specifically designed for S390 Architectures, such as the highly efficient Use for Heavy Monitors and Fast Locking Scheme.* Co-authored pull requests to enhance the overall functionality and performance of the project, catering to all architectures.* Addressed and resolved multiple failing test cases* Implemented code enhancements to elevate code readability, enabling ease of comprehension and facilitating future modifications.* Improved the build process by implementing advanced calculations for new build job creation, resulting in reduced build time. * Recognized for the substantial impact of my contributions to the community, attaining the esteemed Committer Status.

Bengaluru, Karnataka, India

I was part of the IBM-zSCC (Z Security and Compliance Center) team, where I have worked on Integration Test repository.* started by learning LCC framework, despite its unfamiliarity at the outset, and implement tests and checks for around 64% of the APIs.* Used parallel execution method for tests, resulting in execution time reductions of up to 81%. This significantly reduced the time taken by testing process.

From May2024 onwards, I have started my new journey as s390x Port Project Lead. I look after the new JEPs/Issues/Ports done for other architecture which could be beneficial for s390s architecture as well.

I have established myself as a valuable asset within the project. With a proven track record of contributions and accomplishments, I have been granted the status of Committer, showing my record of actively contributing in OpenJDK Project.

With author status, I have the privilege to open new issues in the Java Bug System (JBS) and nominate myself for working on existing issues.