Premier push en tant que BUT2

SCR3.1/TP1/src/ij_ji.c

@@ -0,0 +1,38 @@
+/* accès mémoire */
+
+#include<stdio.h>
+#include<time.h>
+#include <stdlib.h>
+#define N 8192 
+
+int t[N][N];
+
+static inline double tstamp(void) 
+{                             
+	struct timespec tv;
+	clock_gettime(CLOCK_REALTIME, &tv);
+	return tv.tv_sec + tv.tv_nsec * 1.0e-9;
+}
+
+int main()
+{
+	int i,j;
+	double t1,t2;
+	t1=tstamp();
+
+	/* version 1 */     
+
+	for(i=0;i<N;i++) for(j=0;j<N;j++) 
+		t[i][j] = 1;  
+
+	/* version 2 */ 
+
+	//  for(i=0;i<N;i++) for(j=0;j<N;j++) 
+	//t[j][i] = 1;  
+	//
+	t2=tstamp();
+	printf("time = %lf\n",t2-t1);
+	return 0;
+
+}
+