Tomislav Janjusic
Dallas, Texas, United States
Summary
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RockstarTomislav Janjusic is a software engineer based in Dallas with 10 years of experience focused on computer systems research and engineering, particularly computer architecture, memory allocation, cache performance, and parallel computing. He currently applies this expertise at Mellanox Technologies, working on low-level systems where performance and concurrency matter. An active contributor to Open MPI, he has deep practical experience optimizing the UCX communication layer, simplifying core code paths, and resolving tricky issues around dynamic windows and atomic operations. His background blends academic-style systems research with production-grade optimization, making him adept at turning theoretical performance insights into robust, maintainable code.
10 years of coding experience
Github Skills (7)
c1710
ucx10
mpi10
hpc10
openmpi10
c1110
fortran5
Programming languages (5)
Github contributions (5)
open-mpi/ompi
Jul 2020 - Jan 2023
Open MPI main development repository
Role in this project:
Back-end Developer
Back-end DeveloperContributions:382 reviews, 174 commits, 430 PRs in 2 years 6 months
Contributions summary:Tomislav's contributions focused on optimizing and refining the Open MPI library, with a strong emphasis on the UCX communication layer. Their work involved code reduction, simplification, and bug fixes within core files related to worker pools, context records, and memory management. Furthermore, the user demonstrated expertise in identifying and resolving issues related to dynamic windows and atomic operations. The user's commits suggest a detailed understanding of UCX integration within the MPI framework.
openmpichpcmpifortran
janjust/mpich
Jul 2017 - Feb 2026
Official MPICH Repository
Contributions:18 pushes, 6 branches in 8 years 9 months
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