What are the challenges in designing multi-core embedded systems?

Multi-core embedded systems offer increased performance but introduce significant complexity. Challenges: Resource sharing: Cache coherency overhead. Memory bandwidth contention. Shared peripheral access. Interconnect bottlenecks. Timing analysis: WCET affected by other cores' activity. Cache interference from shared caches. Memory controller delays from concurrent access. Determinism harder to guarantee. Software partitioning: Deciding what runs where. Load balancing across cores. Minimizing inter-core communication. Asymmetric multiprocessing (AMP) vs symmetric (SMP). Synchronization: Lock contention scaling. Avoiding priority inversion across cores. Memory ordering and barriers. Debugging: Race conditions harder to reproduce. Non-deterministic behavior. Limited visibility into all cores simultaneously. Design patterns: Core affinity for critical tasks. Memory partitioning to reduce interference. Inter-processor communication (shared memory, message passing). Dedicated cores for I/O or safety functions. Hypervisors for isolation in mixed-criticality.