What is remote procedure call (RPC) in the context of distributed mission computers, and what challenges arise in real-time deterministic RPC?

What is remote procedure call (RPC) in the context of distributed mission computers, and what challenges arise in real-time deterministic RPC?

• A. RPC enables modules to invoke functions across networks.
• B. RPC is always deterministic and has no latency.
• C. RPC enables modules to invoke functions across networks; challenges include latency, determinism, synchronization, error handling; address with bounded latency and real-time RPC patterns.
• D. RPC is not used in distributed mission computers.

Answer: (C)

Remote procedure call is a way for modules across a distributed mission computer to invoke a function on a remote component as if it were a local call. In real-time deterministic RPC, the aim is to have predictable, bounded timing for every remote call so the overall system remains stable and responsive. The challenges include network latency and jitter, maintaining strict timing (determinism) across multiple nodes, keeping clocks synchronized, and handling errors or timeouts without robbing the control loop of predictability. To meet these needs, the design uses bounded latency transports, explicit deadlines, deterministic scheduling, and robust fault handling that keeps state consistent and operations idempotent. This approach focuses on delivering predictable communication and timing guarantees, handled through real-time RPC patterns and bounded latency strategies.

Remote procedure call is a way for modules across a distributed mission computer to invoke a function on a remote component as if it were a local call. In real-time deterministic RPC, the aim is to have predictable, bounded timing for every remote call so the overall system remains stable and responsive. The challenges include network latency and jitter, maintaining strict timing (determinism) across multiple nodes, keeping clocks synchronized, and handling errors or timeouts without robbing the control loop of predictability. To meet these needs, the design uses bounded latency transports, explicit deadlines, deterministic scheduling, and robust fault handling that keeps state consistent and operations idempotent. This approach focuses on delivering predictable communication and timing guarantees, handled through real-time RPC patterns and bounded latency strategies.