129 lines
2.9 KiB
C++
129 lines
2.9 KiB
C++
#include <vector>
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#include <list>
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#include <iterator>
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#include <map>
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#include <set>
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#include <unordered_map>
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#include <stdlib.h>
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#include <stdio.h>
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#include <stdbool.h>
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#include <sys/types.h>
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#include <sys/resource.h>
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#include <sys/time.h>
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#define NDEBUG
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using namespace std;
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static unsigned long long
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cputime (void)
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{
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struct rusage rus;
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getrusage (0, &rus);
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return rus.ru_utime.tv_sec * 1000000ULL + rus.ru_utime.tv_usec;
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}
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static unsigned int randValue = 0;
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static void rand_init(void)
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{
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randValue = 0;
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}
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static unsigned int rand_get(void)
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{
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randValue = randValue * 31421U + 6927U;
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return (int) randValue;
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}
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static void test_function(const char str[], size_t n, void (*func)(size_t))
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{
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unsigned long long start, end;
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// (*func)(n);
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start = cputime();
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(*func)(n);
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end = cputime();
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end = (end - start) / 1000U;
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printf ("%s %Lu ms for n = %lu\n", str, end, n);
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}
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/********************************************************************************************/
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static void test_list(size_t n)
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{
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rand_init();
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list<unsigned int> a1, a2;
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for(size_t i = 0; i < n; i++) {
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a1.push_back(rand_get() );
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a2.push_back(rand_get() );
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}
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unsigned int s = 0;
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for (list<unsigned int>::const_iterator ci1 = a1.begin(), ci2 = a2.begin (); ci1 != a1.end(); ++ci1, ++ci2) {
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s += *ci1 * *ci2;
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}
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}
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/********************************************************************************************/
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static void test_array(size_t n)
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{
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rand_init();
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vector<unsigned int> a1, a2;
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for(size_t i = 0; i < n; i++) {
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a1.push_back(rand_get() );
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a2.push_back(rand_get() );
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}
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unsigned int s = 0;
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for(unsigned long i = 0; i < n; i++) {
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s += a1[i] * a2[i];
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}
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}
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/********************************************************************************************/
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static void test_rbtree(size_t n)
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{
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rand_init();
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set<unsigned long> tree;
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for (size_t i = 0; i < n; i++) {
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tree.insert(rand_get());
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}
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unsigned int s = 0;
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for (size_t i = 0; i < n; i++) {
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set<unsigned long>::iterator it = tree.find(rand_get());
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if (it != tree.end())
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s += *it;
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}
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}
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/********************************************************************************************/
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static void
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test_dict(unsigned long n)
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{
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rand_init();
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unordered_map<unsigned long, unsigned long> dict;
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for (size_t i = 0; i < n; i++) {
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dict[rand_get()] = rand_get();
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}
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unsigned int s = 0;
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for (size_t i = 0; i < n; i++) {
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unordered_map<unsigned long, unsigned long>::iterator it = dict.find(rand_get());
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if (it != dict.end())
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s += it->second;
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}
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}
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/********************************************************************************************/
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int main(int argc, const char *argv[])
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{
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test_function("List time",10000000, test_list);
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test_function("Array time", 100000000, test_array);
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test_function("Rbtree time", 1000000, test_rbtree);
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test_function("Dict time", 1000000, test_dict);
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}
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