What is Out-of-order execution?
Executing instructions as soon as their dependencies allow, in a different order from the program, to improve performance. Results are committed in program order through a reorder buffer.
Field: CPUs and architecture
Out-of-order execution in the explanations
Combined with out-of-order execution it boosts performance, but dependency-checking logic grows roughly with the square of the width, so width cannot be increased indefinitely.
What is the processor design called that issues and execute…Out-of-order execution sets aside instructions waiting on earlier results or memory data and executes later, ready instructions first—especially valuable for doing useful work during cache-miss stalls.
Which technique examines instruction dependencies and execu…Superscalar issue, out-of-order execution, branch prediction and large caches all raise IPC.
Which metric indicates the number of instructions executed …
Questions that mention Out-of-order execution (3)
- What is the processor design called that issues and executes multiple instructions simultaneously in one clock cycle?
- Which technique examines instruction dependencies and executes ready instructions in an order different from the program order to improve performance?
- Which metric indicates the number of instructions executed per clock?
Related terms
Superscalar IPC Branch prediction Amdahl's law Cache coherency Cache memory DMA (direct memory access) DVFS (dynamic voltage and frequency scaling) GPU Instruction set architecture (ISA)