From b5871ab969c66eb27974b078e0efe44e268d112c Mon Sep 17 00:00:00 2001
From: Tianhao Wang <wth@riseup.net>
Date: Thu, 2 Nov 2023 01:31:40 +0100
Subject: use char array

---
 testn.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/testn.c b/testn.c
index 84815aa..36a15c3 100644
--- a/testn.c
+++ b/testn.c
@@ -1,14 +1,19 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <time.h>
+// 256 bytes = 4 * 64 = 4 * cachelines
+// with 4-way associative cache one row
+// traverse each set.
+// With 8-way associative cache the col number
+// should be doubled.
+#define COLS 256
 #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 arr[ROWS][COLS+OFF*4] __attribute__((aligned(4096)));
 char arr2[VFL];
 
 int main() {
-- 
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