On the basis of the "modern processor design - the superscalar processor" wrote this book to measure processor performance available time/program
Where
1/performance/program==time (instructions/procedures) x (cycles/instruction) x (time/clock cycles)
Time/clock cycles in the book said that the time required for each clock cycle, which is the machine clock cycle time,
So the clock cycle time is refers to the CPU clock cycles?

CodePudding user response:

Can say so, such as samsung S3C410 frequency 533 MHZ, is refers to the frequency after PLL phase-locked loop CPU core after the actual frequency, general CPU instructions are 1 ~ 2 clock cycles, as for the instruction lines classification, can need not consider first, simple point, like on STC 51 single-chip microcomputer 89 c52, external clock 12 MHZ, actual 51 kernel running clock is 12 MHZ, machine clock cycles or instruction cycle=1/12 microseconds (the reciprocal of frequency)

CodePudding user response:

Is the clock cycle, the frequency of the CPU frequency doubling over the bottom

CodePudding user response:

Clock cycles: a clock pulse time, in the computer composition principle also called T cycle or clock pulse, is the basic unit of time of the CPU and other single chip microcomputer, it can be said for the crystal clock frequency (the number of clock pulse in 1 second) bottom (which is 1 s/clock pulse number, such as 1/12 MHZ), for the CPU, in one clock cycle, the CPU is only done a basic action, clock pulse is the basic work of computer, computer controls the pace of work, the higher the clock frequency, the shorter the clock cycle is, the faster pace of work may, in the description of the CPU clock cycle, also called beats, is divided into several equal a machine cycle time, each paragraph only complete a basic operation, with a corresponding level signal width, for example: personal understanding of working frequency of 100 MHZ chip clock cycles of 10000 ns, interpreted as 1 s (9 of 10 square ns) within the clock cycle number 8 to 10 to the power, so every clock cycle time of 9 to 10 square ns/10 8 times of the clock cycle, the results of 10 ns,

In conclusion, clock cycles as small as possible, this represents a week period there will be more instruction processing is completed, also means that the higher the performance ~

CodePudding user response:

The reciprocal of frequency, a pulse time