NUMA NUMA NUMA

Understanding NUMA in modern CPU architecture

This question tests your grasp of Non-Uniform Memory Access (NUMA), a fundamental concept in modern multiprocessor system design. NUMA describes how memory latency and bandwidth vary depending on which processor accesses which region of the address space—a reality that shapes performance in servers, data centers, and high-frequency trading infrastructure.

The question rewards candidates who understand why NUMA matters: on large systems with multiple CPU sockets, local memory access is dramatically faster than remote access. Strong answers explain the architectural distinction between local and remote memory, the role of interconnects between sockets, and how this affects algorithm design and system tuning. This is essential knowledge for anyone writing latency-sensitive code or optimizing systems at scale.

• Cache coherency protocols across sockets
• Memory controllers and NUMA topology
• Impact on thread affinity and scheduling
• Performance implications for distributed algorithms