init

1 files changed, 42 insertions, 0 deletions

diff --git a/testn.c b/testn.c
new file mode 100644
index 0000000..84815aa
--- /dev/null
+++ b/testn.c
@@ -0,0 +1,42 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#define ROWS 1024
+#define COLS 64
+#define VFL 6291456
+#ifndef OFF
+#define OFF 0
+#endif
+
+char arr[ROWS*4][(COLS+OFF)*4] __attribute__((aligned(4096)));
+char arr2[VFL];
+
+int main() {
+	int i, j, k;
+	time_t t;
+	volatile int xor;
+	srand(0x42069);
+	// init array with random values
+	for (i = 0; i < ROWS; i++) {
+		for (j = 0; j < COLS; j++) {
+			arr[i][j] = rand()%255;
+		}
+	}
+
+	// "flush" 6MiB cache
+	// for(i = 0; i < VFL; i++)arr2[i] = i*i;
+	// for(i = 0; i < VFL; i++)arr2[i] += 1;
+
+	// mem barrier
+	__sync_synchronize();
+	t = clock();
+	for (i = 1; i < ROWS; i++) {
+		for (j = 0; j < COLS; j++) {
+			arr[i][j] *= arr[i-1][j];
+			xor ^= arr[i][j];
+		}
+	}
+	t = clock() - t;
+	printf("%ld",t);
+}
+