3

exp1/psum64.c

@@ -7,7 +7,14 @@
 #include <stdlib.h>
 #include <pthread.h>
 #include <semaphore.h>
-#include <time.h>
+#include <sys/time.h>
+
+double get_time()
+{
+    struct timeval tv;
+    gettimeofday(&tv, NULL);
+    return tv.tv_sec + tv.tv_usec / 1000000.0;
+}
 
 #define MAXTHREADS 16
 
@@ -32,6 +39,7 @@ int main(int argc, char **argv)
     nelems = (1LL << log_nelems);
     nelems_per_thread = nelems / nthreads;
     
+    double t_start = get_time();
     for ( i = 0; i < nthreads; i++)
     {
         myid[i] = i;
@@ -50,12 +58,14 @@ int main(int argc, char **argv)
     
     if (result == (nelems*(nelems-1))/2)
     {
-        printf("Correct result: %ld\n",result);
+        printf("Correct result: %llu\n",result);
     }
     else
     {
-        printf("Wrong result: %ld\n",result);
+        printf("Wrong result: %llu\n",result);
     }
+    double t_end = get_time();
+    printf("Time taken: %f seconds\n", t_end - t_start);
 
     exit(0);
 }