Fixed eviction time, which caused each value to be evicted

csim.c

@@ -1,174 +0,0 @@
-/**
- * Groupmembers:
- * 1. Anna Schlittenhardt
- * 2. Tuan-Dat Tran
- */
-
-#include <stdlib.h>
-#include <stdio.h>
-#include <getopt.h>
-#include <ctype.h>
-#include <string.h>
-#include <math.h>
-#include "cachelab.h"
-
-int v = 0; /* verbose */
-int s = 0; /* set index */
-int E = 0; /* Set of cache lines */
-int b = 0; /* Block offset */
-int S; /* Set of Set of cache lines*/
-int B; /* Block size */
-long long time = 0;
-FILE *tracefile; /* File to trace from */
-struct cache_line **cache; /* cache */
-
-int hit = 0, miss = 0, eviction = 0;
-
-struct cache_line {
-  unsigned char v;
-  unsigned int tag;
-  unsigned int time;
-};
-
-void print_help() {
-  printf("Usage: ./csim-ref [-hv] -s <s> -E <E> -b <b> -t <tracefile>\n");
-  printf("  -h: Optional help flag that prints usage info\n");
-  printf("  -v: Optional verbose flag that displays trace info\n");
-  printf("  -s <s>: Number of set index bits (S = 2 s is the number of sets)\n");
-  printf("  -E <E>: Associativity (number of lines per set)\n");
-  printf("  -b <b>: Number of block bits (B = 2 b is the block size)\n");
-  printf("  -t <tracefile>: Name of the valgrind trace to replay\n");
-}
-
-void init() {
-  cache = (struct cache_line **) malloc(S*sizeof(struct cache_line *));
-  for (int i = 0; i < S; i++) {
-    struct cache_line* cache_set =  (struct cache_line *) malloc(E*sizeof(struct cache_line));
-    cache[i] = cache_set;
-    for (int j = 0; j < E; j++) {
-      cache_set[j].v = 0;
-      cache_set[j].tag = 0;
-      cache_set[j].time = 0;
-    }
-  }
-}
-
-void clean() {
-  for (int i = 0; i < S; i++) {
-    free(cache[i]);
-  }
-  free(cache);
-  fclose(tracefile);
-}
-
-void accessMem (int addr) {
-  unsigned int set = ((addr >> b) & ((1LL << s) - 1));
-  unsigned int tag = addr >> (b + s);
-  struct cache_line *cache_set = cache[set];
-  long evic_time = 0;
-  int evic_line = 0;
-  for (int i = 0; i < E; i++) {
-    if (cache_set[i].tag == tag && cache_set[i].v != 0){
-      if (v) { printf("hit "); }
-      hit++;
-      cache_set[i].time = time;
-      time++;
-      return;
-    }
-  }
-
-  if (v) { printf("miss "); }
-  miss++;
-
-  for (int i = 0; i < E; i++) {
-    if (cache_set[i].time < evic_time) {
-      evic_line = i;
-      evic_time = cache_set[i].time;
-    }
-  }
-
-  if (cache_set[evic_line].v == 1) {
-    if (v) { printf("eviction "); }
-    eviction++;
-  }
-
-  cache_set[evic_line].v = 1;
-  cache_set[evic_line].tag = tag;
-  cache_set[evic_line].time = time;
-  time++;
-  return;
-}
-
-void trace() {
-  char op;
-  unsigned address;
-  int size;
-
-  while (fscanf(tracefile, " %c %x,%d", &op, &address, &size) > 0 ) {
-    switch (op) {
-    case 'M':
-      if (v) { printf("%c %x,%d ", op, address, size); }
-      accessMem(address);
-      accessMem(address);
-      printf("\n");
-      break;
-    case 'L':
-      if (v) { printf("%c %x,%d ", op, address, size); }
-      accessMem(address);
-      printf("\n");
-      break;
-    case 'S':
-      if (v) { printf("%c %x,%d ", op, address, size); }
-      accessMem(address);
-      printf("\n");
-      break;
-    }
-  }
-}
-
-int main(int argc, char *argv[]) {
-  char c;
-  while ((c = getopt(argc, argv, "s:E:b:t:vh")) != -1) {
-    switch (c) {
-    case 'h':
-      print_help();
-      exit(0);
-      break;
-    case 'v':
-      v = 1;
-      break;
-    case 's':
-      s = atoi(optarg);
-      break;
-    case 'E':
-      E = atoi(optarg);
-      break;
-    case 'b':
-      b = atoi(optarg);
-      break;
-    case 't':
-      tracefile = fopen(optarg, "r");
-      break;
-    }
-  }
-
-  if (s == 0 || E == 0 || b == 0 || tracefile == NULL) {
-    print_help();
-    exit(1);
-  }
-
-  S = pow(2, s);
-  B = pow(2, b);
-
-  init();
-  trace();
-  for (int i = 0; i < S; i++) {
-    for (int j = 0; j < E; j++) {
-      // printf("cache[%d][%d]: %c %x %ul\n", i, j, cache[i][j].v, cache[i][j].tag, cache[i][j].time);
-    }
-  }
-  clean();
-
-  printSummary(hit, miss, eviction);
-  return 0;
-}

src/csim.c

@@ -10,6 +10,7 @@
 #include <ctype.h>
 #include <string.h>
 #include <math.h>
+#include <limits.h>
 #include "cachelab.h"
 
 int v = 0; /* verbose */
@@ -51,6 +52,7 @@ void init() {
       cache_set[j].time = 0;
     }
   }
+  printf("cache: %ld, cache_set: %ld, cache_line: %ld\n", sizeof(cache), sizeof(cache[0]), sizeof(cache[0][0]));
 }
 
 void clean() {
@@ -64,11 +66,13 @@ void clean() {
 void accessMem (int addr) {
   unsigned int set = ((addr >> b) & ((1LL << s) - 1));
   unsigned int tag = addr >> (b + s);
+
   struct cache_line *cache_set = cache[set];
-  unsigned long evic_time = 0;
+  unsigned long evic_time = ULONG_MAX;
   unsigned int evic_line = 0;
+
   for (int i = 0; i < E; i++) {
-    if (cache_set[i].tag == tag && cache_set[i].v != 0){
+    if (cache_set[i].tag == tag && cache_set[i].v == 1){
       if (v) { printf("hit "); }
       hit++;
       cache_set[i].time = time;
@@ -164,11 +168,6 @@ int main(int argc, char *argv[]) {
 
   init();
   trace();
-  for (int i = 0; i < S; i++) {
-    for (int j = 0; j < E; j++) {
-      // printf("cache[%d][%d]: %c %x %ul\n", i, j, cache[i][j].v, cache[i][j].tag, cache[i][j].time);
-    }
-  }
   clean();
 
   printSummary(hit, miss, eviction);