(原創) 如何對程式片段進行效能測試(benchmark) (C/C++) (C)
1
/*
2
(C) OOMusou 2006 http://oomusou.cnblogs.com
3
4Filename : Benchmark.cpp
5Compiler : Visual C++ 8.0
6Description : Demo how to caculate processing time of specified function.
7
*/
8
#include <iostream>
9#include <ctime>
10
11void sub();
12
13int main() {
14 // clock_t is typedef of (long)
15 clock_t t = clock();
16
17 sub();
18
19 t = clock() -t;
20
21 // CLOCKS_PER_SEC is macro
22 std::cout << "Process time:" << (double)t/CLOCKS_PER_SEC << " sec (" << t << " clocks)" << std::endl;
23
24 return 0;
25}
26
27void sub() {
28
for(int i=0; i != 10000; ++i) {
29 for(int j=0; j != 100000; ++j) {
30 ;
31
}
32 }
33}
/* 
2
(C) OOMusou 2006 http://oomusou.cnblogs.com3
4
Filename : Benchmark.cpp5
Compiler : Visual C++ 8.06
Description : Demo how to caculate processing time of specified function.7
*/8
#include <iostream>9
#include <ctime>10
11
void sub();12
13
int main() {
14
// clock_t is typedef of (long)15
clock_t t = clock(); 16
17
sub();18
19
t = clock() -t;20
21
// CLOCKS_PER_SEC is macro22
std::cout << "Process time:" << (double)t/CLOCKS_PER_SEC << " sec (" << t << " clocks)" << std::endl;23
24
return 0;25
}26
27
void sub() {28
for(int i=0; i != 10000; ++i) {
29
for(int j=0; j != 100000; ++j) {30
;31
}32
}33
}See Also
(原創) 如何對程式片段進行效能測試(benchmark) (.NET) (C#)
Reference
C程式設計 500個應用範例技巧大全集,平田 豐,P.468
