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Debug #3

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Debug #3

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bd5eef3
Debug
zhuodiliu Apr 25, 2017
7c13e2e
Merge remote-tracking branch 'refs/remotes/RemindD/master'
zhuodiliu Apr 26, 2017
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73 changes: 13 additions & 60 deletions src/CPU.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -109,30 +109,6 @@ void getProcedureOverhead(std::vector<double> &overhead){
}

double getSystemCallOverhead() {
uint64_t start, end;
int SUC_TIMES = 0;
pid_t pid;
double sum = 0;
for (int i=0; i<LOOP_TIMES; ++i) {
switch (pid = fork()) {
case -1:
exit(-1);
break;
case 0:
start = rdtsc();
getpid();
end = rdtsc();
sum += (end - start);
SUC_TIMES++;
exit(0);
default:
}
}
return sum / (double)SUC_TIMES;
}

// Test for cache of system call
double getSystemCallOverhead2() {
uint64_t start, end;
double sum = 0;
for (int i=0; i<LOOP_TIMES; ++i) {
Expand All @@ -153,28 +129,12 @@ double getThreadCreationOverhead() {
for (int i=0; i<LOOP_TIMES; ++i) {
start = rdtsc();
pthread_create(&threadId, NULL, newThread, NULL);
pthread_join(threadId, NULL);
end = rdtsc();
sum += (end - start);
}
return sum / (double)LOOP_TIMES;
}
// Test for succeed create
double getThreadCreationOverhead2() {
uint64_t start, end;
pthread_t threadId;
int SUC_TIMES = 0, res;
double sum = 0;
for (int i=0; i<LOOP_TIMES; ++i) {
start = rdtsc();
res = pthread_create(&threadId, NULL, newThread, NULL);
end = rdtsc();
if (res==0) {
sum += (end - start);
SUC_TIMES++;
}
}
return sum / (double)SUC_TIMES;
}

double getProcessCreationOverhead() {
uint64_t start, end;
Expand All @@ -184,13 +144,16 @@ double getProcessCreationOverhead() {
for (int i=0; i<LOOP_TIMES; ++i) {
start = rdtsc();
switch (pid = fork()) {
case 0:
exit(1);
case 1:
wait(NULL);
end = rdtsc();
sum += (end - start);
SUC_TIMES++;
case -1:
exit(-1);
break;
case 0:
exit(0);
default:
wait(NULL);
end = rdtsc();
sum += (end - start);
SUC_TIMES++;
}
}
return sum / (double)SUC_TIMES;
Expand All @@ -208,29 +171,19 @@ int main() {
std::vector<double> procedureOverhead;
getProcedureOverhead(procedureOverhead);
for (int i=0; i<8; ++i) {
printf("The average ovehead of a function with %d integer arguments is %f\n", i, procedureOverhead[i]);
printf("The average overhead of a function with %d integer arguments is %f\n", i, procedureOverhead[i]);
}

for (int i=0; i<REPEAT_TIMES; ++i) {
printf("system call overhead for %d times is %f\n", i, getSystemCallOverhead());
}

for (int i=0; i<REPEAT_TIMES; ++i) {
printf("system call overhead2 for %d times is %f\n", i, getSystemCallOverhead2());
printf("system call overhead for %d times is %f\n", i, getSystemCallOverhead()));
}

for (int i=0; i<REPEAT_TIMES; ++i) {
printf("thread creation overhead for %d times is %f\n", i, getThreadCreationOverhead());
}

for (int i=0; i<REPEAT_TIMES; ++i) {
printf("thread creation overhead2 for %d times is %f\n", i, getThreadCreationOverhead2());
}

for (int i=0; i<REPEAT_TIMES; ++i) {
printf("process creation overhead for %d times is %f\n", i, getProcessCreationOverhead());
}


return 0;
}