MIPS:Million Instructions Per Second

MCPS:Million Cycles Per Second

MIPS = Total Instructions*Sampling frequency/(No of frames * Samples per frame*1000000)

MCPS = Total Cycles*Sampling frequency/(No of frames * Samples per frame*1000000)
MHz is same as MCPS

And as we know , some instructions may take more than 1 cycle ,so sometimesMIPS >= MCPS.

But as the Parallel Processing techniquedeveloping,one cyclecan excute more than oneinstruction, so sometime MCPS>=MIPS

Also some time the frame length is not uniform, so the they will be

MIPS = Total Instructions/(Total playout time *1000000)

MHz=MCPS = Total Cycles/(Total playout time*1000000)

For example:

struct timespec start, end;

unsinged long diff_ns;

clock_gettime(CLOCK_THREAD_CPUTIME_ID, &start);

process()// process fixed in CPU core, process N samples;

clock_gettime(CLOCK_THREAD_CPUTIME_ID, &end);

diff_ns = (end.tv_sec - start.tv_sec) * 1000000000 + (end.tv_nsec - start.tv_nsec) ;

cpu_freq: 1GHz. 1秒鐘經過的時鐘周期

Cycles是處理N個samples所需要的時鐘周期

Cyles:diff_ns * cpu_freq = (diff_ns / 1000000000) * 1 GHz =(diff_ns / 1000000000) * 1000000000Hz;

處理N個samples所需要的時間為：N samples / sampling frequency

MCPS = (Cycles / (N Samples / Sample Frequency)) / 1000000;

總結

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