IPC (Instruction Per Clock) refers to how many instructions are executed in each clock cycle of the CPU.
HPC (High Performance Computing) high-performance computer group
Basically one instruction is one cycle.
The operation of accessing memory often takes more than 3 instruction cycles, and the ones with MMU and cache are even more uncertain.
Not only the execution time of each instruction of arm is fixed, but the instruction length is also fixed.
Cycle: is time, the time to complete a task
Instruction cycle: The sum of the time taken by the CPU to fetch an instruction from the memory and execute this instruction.
CPU cycle: also known as machine cycle. It takes a long time for the CPU to access the memory once, so it is defined by the shortest time to read an instruction word from the memory.
Clock period: Usually called the beat pulse or T period. A CPU cycle contains several clock cycles. The clock period is also called the oscillation period, which is defined as the reciprocal of the clock frequency. The clock cycle is the most basic and smallest unit of time in a computer.
Bus cycle (BUS Cycle): That is, the time used for a memory access or I/O port operation.