《体系结构》实验报告模板封面.docVIP

《计算机体系结构》实验报告 姓 名 学 号 专 业 班 级 联系同组实验者实 验日 期课后写出对本次实验的体会。学到了什么知识、加深了对什么内容的理解等。#include stdlib.h #include stdio.h #include time.h #include sys/time.h #include unistd.h #define size 1000 #define step 1000 main() { int i, j, k, temp; char *a; clock_t end; struct timeval time1, time2; gettimeofday(time1, NULL); //取得当前系统时间 a = (char *) malloc(size * size); //为数组 a 申请内存空间 for (i = 0; i size; i++) for (j = 0; j size; j++) a[i * size + j] = (char) (10.0 * rand() / (RAND_MAX + 1.0)); for (i = 0; i size; i++) for (j = 0; j size; j++) for (k = 0; k step; k++) temp = a[i * size + j] * a[i * size + j]; end = clock(); //取得 CPU 时间 gettimeofday(time2, NULL); //取得当前的系统时间 time2.tv_sec -= time1.tv_sec; //计算响应时间 time2.tv_usec -= time1.tv_usec; if (time2.tv_usec 0L) { time2.tv_usec += 1000000L; time2.tv_sec -= 1; } printf(CPU time is: %f\n, end / 1000000.0); printf(Wall clock time is:%ld.%6ld seconds\n, time2.tv_sec,time2.tv_usec); free(a); return 0; } 程序2： #include stdlib.h #include stdio.h #include time.h #include sys/time.h #define size 1000 #define step 1000 main() { int i, j, k, temp; char *a; FILE *fp; clock_t end; struct timeval time1, time2; gettimeofday(time1, NULL); fp = fopen(data.dat, r); a = (char *) malloc(size * size); for (i = 0; i size; i++) for (j = 0; j size; j++) a[i * size + j] = fgetc(fp); fclose(fp); for (i = 0; i size; i++) for (j = 0; j size; j++) for (k = 0; k step; k++) temp = a[i * size + j] * a[i * size + j]; end = clock(); gettimeofday(time2, NULL); time2.tv_sec -= time1.tv_sec; time2.tv_usec -= time1.tv_usec; if (time2.tv_usec 0L) { time2.tv_usec += 1000000L; time2.tv_sec -= 1; } printf(CPU time is: %f\n, end / 1000000.0)