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  2. Cycles per instruction - Wikipedia

    en.wikipedia.org/wiki/Cycles_per_instruction

    In computer architecture, cycles per instruction (aka clock cycles per instruction, clocks per instruction, or CPI) is one aspect of a processor's performance: the average number of clock cycles per instruction for a program or program fragment. [1] It is the multiplicative inverse of instructions per cycle.

  3. Clock rate - Wikipedia

    en.wikipedia.org/wiki/Clock_rate

    As each instruction took 20 cycles, it had an instruction rate of 5 kHz. The first commercial PC, the Altair 8800 (by MITS), used an Intel 8080 CPU with a clock rate of 2 MHz (2 million cycles per second). The original IBM PC (c. 1981) had a clock rate of 4.77 MHz (4,772,727 cycles

  4. Instructions per second - Wikipedia

    en.wikipedia.org/wiki/Instructions_per_second

    Instructions per second (IPS) is a measure of a computer's processor speed. For complex instruction set computers (CISCs), different instructions take different amounts of time, so the value measured depends on the instruction mix; even for comparing processors in the same family the IPS measurement can be problematic.

  5. Instructions per cycle - Wikipedia

    en.wikipedia.org/wiki/Instructions_per_cycle

    The number of instructions per second and floating point operations per second for a processor can be derived by multiplying the number of instructions per cycle with the clock rate (cycles per second given in Hertz) of the processor in question. The number of instructions per second is an approximate indicator of the likely performance of the ...

  6. Computer performance - Wikipedia

    en.wikipedia.org/wiki/Computer_performance

    Computer performance metrics (things to measure) include availability, response time, channel capacity, latency, completion time, service time, bandwidth, throughput, relative efficiency, scalability, performance per watt, compression ratio, instruction path length and speed up.

  7. Iron law of processor performance - Wikipedia

    en.wikipedia.org/wiki/Iron_law_of_processor...

    Generally speaking, however, complex instructions inflate the number of clock cycles per instruction because they must be decoded into simpler micro-operations actually performed by the hardware. After converting X86 binary to the micro-operations used internally, the total number of operations is close to what is produced for a comparable RISC ...

  8. CPU time - Wikipedia

    en.wikipedia.org/wiki/CPU_time

    POSIX allows this clock to start at an arbitrary value, so to measure elapsed time, a program calls clock(), does some work, then calls clock() again. [1] The difference is the time needed to do the work. The POSIX function getrusage() returns more than just the CPU time consumed by a process in a POSIX environment.

  9. Clock cycles per instruction - Wikipedia

    en.wikipedia.org/?title=Clock_cycles_per...

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