使用 google-perftools 剖析程序性能瓶颈

voidconsumeSomeCPUTime1(intinput){

inti=0;

input++;

while(i++<10000){

i--;i++;i--;i++;

}

};

voidconsumeSomeCPUTime2(intinput){

input++;

consumeSomeCPUTime1(input);

inti=0;

while(i++<10000){

i--;i++;i--;i++;

}

};

intstupidComputing(inta,intb){

inti=0;

while(i++<10000){

consumeSomeCPUTime1(i);

}

intj=0;

while(j++<5000){

consumeSomeCPUTime2(j);

}

returna+b;

};

intsmartComputing(inta,intb){

returna+b;

};

voidmain(){

inti=0;

printf("reachedthestartpointofperformancebottleneck\n");

sleep(5);

//ProfilerStart("CPUProfile");

while(i++<10){

printf("Stupidcomputingreturn:%d\n",stupidComputing(i,i+1));

printf("Smartcomputingreturn%d\n",smartComputing(i+1,i+2));

}

printf("shouldteminateprofilingnow.\n");

sleep(5);

//ProfilerStop();

}