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przyklad: przyklad.cpp | |
g++ przyklad.cpp -o run | |
g++ przyklad.cpp -o run_o1 -O1 | |
g++ przyklad.cpp -o run_o2 -O2 | |
g++ przyklad.cpp -o run_o3 -O3 | |
suma: suma.cpp | |
g++ suma.cpp -o suma | |
g++ suma.cpp -o suma_o1 -O1 | |
g++ suma.cpp -o suma_o2 -O2 | |
g++ suma.cpp -o suma_o3 -O3 |
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#include <iostream> | |
#include <iomanip> | |
#include <ctime> | |
double duration(int (*f)(int), int n, int rep) | |
{ | |
std::clock_t tic = std::clock(); | |
for (int i = 0; i < rep; ++i) | |
f(n); | |
std::clock_t tac = std::clock(); | |
return static_cast<double>(tac - tic) / CLOCKS_PER_SEC; | |
} | |
int rekurencja(int n) | |
{ | |
if (n > 0) | |
rekurencja(n-1); | |
return 1; | |
} | |
int rekurencja_ogonowa(int n) | |
{ | |
if (n == 0) | |
return 1; | |
return rekurencja_ogonowa(n-1); | |
} | |
int iteracja(int n) | |
{ | |
for (int i = n; i >= 0; --i) | |
{ | |
if (n == 0) | |
return 1; | |
} | |
} | |
int main(int argc, char** argv) | |
{ | |
int n = 50; | |
int rep = 100000000; | |
std::cout << "Uruchomiono: " << argv[0] << "\n"; | |
std::cout << std::setw(10) << "zwykla:" << std::setw(10) << duration(rekurencja, n, rep) << "\n"; | |
std::cout << std::setw(10) << "ogonowa:" << std::setw(10) << duration(rekurencja_ogonowa, n, rep) << "\n"; | |
std::cout << std::setw(10) << "iteracja:" << std::setw(10) << duration(iteracja, n, rep) << "\n"; | |
return 0; | |
} |
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#include <iostream> | |
#include <iomanip> | |
#include <ctime> | |
double duration(int (*f)(int), int n, int rep) | |
{ | |
std::clock_t tic = std::clock(); | |
for (int i = 0; i < rep; ++i) | |
f(n); | |
std::clock_t tac = std::clock(); | |
return static_cast<double>(tac - tic) / CLOCKS_PER_SEC; | |
} | |
int iter(int n) | |
{ | |
int sum = 0; | |
for (int i = 0; true; ++i) | |
{ | |
sum += i; | |
if (i == n) | |
break; | |
} | |
return sum; | |
} | |
int rec(int n, int sum = 0) | |
{ | |
if (n == 0) | |
return sum; | |
return rec(n-1, sum+n); | |
} | |
int call_rec(int n) | |
{ | |
return rec(n); | |
} | |
int main(int argc, char** argv) | |
{ | |
int n = 50; | |
int rep = 50000000; | |
std::cout << "Uruchomiono: " << argv[0] << "\n"; | |
std::cout << std::setw(10) << "iteracja:" << std::setw(10) << duration(iter, n, rep) << "\n"; | |
std::cout << std::setw(10) << "rekurencja:" << std::setw(10) << duration(call_rec, n, rep) << "\n"; | |
return 0; | |
} |
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