Developed shared memory communication for the ath3 array in the schism-dev/schism repository, focusing on optimizing intra-node data sharing for high-performance computing workloads. Leveraged Fortran and MPI to implement a conditional SH_MEM_COMM path, utilizing MPI window allocation and management to enable fast, efficient communication between processes on the same node. This approach reduced inter-process latency and established a scalable foundation for multi-process workloads within a single node. The work concentrated on feature delivery and integration, with no major bug fixes reported, and demonstrated a strong emphasis on performance improvements through shared memory and advanced parallel computing techniques.