diff --git a/fftma_module/gen/include/chunk_array.h b/fftma_module/gen/include/chunk_array.h
index 5dd2082..8e366e2 100644
--- a/fftma_module/gen/include/chunk_array.h
+++ b/fftma_module/gen/include/chunk_array.h
@@ -23,6 +23,7 @@ typedef struct chunk_array {
     buffer_t* buffer2;
     buffer_t** buffers;
     size_t n_buffers;
+    size_t last_updated;
 }chunk_array_t;
 
 chunk_array_t* chunk_array_create(char* filename, size_t total_size);
diff --git a/fftma_module/gen/lib_src/chunk_array.c b/fftma_module/gen/lib_src/chunk_array.c
index e28bfd6..db3140c 100644
--- a/fftma_module/gen/lib_src/chunk_array.c
+++ b/fftma_module/gen/lib_src/chunk_array.c
@@ -2,9 +2,10 @@
 #include "stdbool.h"
 #include "stdlib.h"
 #include <sys/mman.h>
+#include <time.h>
 
-#define MAX_CHUNK_SIZE 33554432*2
-#define N_BUFFERS 8
+#define MAX_CHUNK_SIZE 11248640
+#define N_BUFFERS 100
 
 int min(int value1, int value2) {
     if (value1 < value2) return value1;
@@ -22,9 +23,12 @@ int get_mod(chunk_array_t* chunk_array,int init_pos) {
 }
 
 bool inside_buffer(chunk_array_t* chunk_array,int init_pos, size_t pos) {
+    //printf("range: [%d; %d] pos: %d", init_pos, init_pos + chunk_array->chunk_size-1, pos);
     if (pos<init_pos || pos>init_pos + chunk_array->chunk_size-1) {
+        //printf(" FALSE\n");
         return false;
     }
+    //printf(" TRUE\n");
     return true;
 }
 
@@ -48,6 +52,8 @@ void buffer_flush(chunk_array_t* chunk_array, buffer_t* buffer) {
 
 
 void buffer_update(chunk_array_t* chunk_array, buffer_t* buffer, size_t pos) {
+    //printf("[UPDATE BUFFER][%s] old init_pos %d pos %d\n",chunk_array->filename, buffer->init_pos, pos);
+    //printf("miss pos: %d\n", pos);
     buffer_flush(chunk_array, buffer);
     
     if (chunk_array->mmap_array) {
@@ -58,7 +64,7 @@ void buffer_update(chunk_array_t* chunk_array, buffer_t* buffer, size_t pos) {
     }
 }
 
-buffer_t* buffer_create(int size) {
+buffer_t* buffer_create(int size, int init) {
     buffer_t * buffer = (buffer_t*)malloc(sizeof(buffer_t));
 
     if (buffer == NULL) return NULL;
@@ -70,7 +76,7 @@ buffer_t* buffer_create(int size) {
         return NULL;
     }
 
-    buffer->init_pos = 0;
+    buffer->init_pos = init;
     buffer->dirty = false;
 
     return buffer;
@@ -88,21 +94,21 @@ chunk_array_t* chunk_array_create(char* filename, size_t total_size) {
         return NULL;
     }
 
+    printf("totalsize %d\n", total_size);
+
     chunk_array->chunk_size = min(MAX_CHUNK_SIZE, total_size);
 
     chunk_array->buffers = malloc(sizeof(buffer_t) * N_BUFFERS);
 
-    chunk_array->buffers[0] = buffer_create(chunk_array->chunk_size);
-
-    chunk_array->buffers[0]->init_pos = 0;
+    chunk_array->buffers[0] = buffer_create(chunk_array->chunk_size, 0);
 
     chunk_array->n_buffers = 1;
+    chunk_array->last_updated = -1;
 
     for (int i = 1; i<N_BUFFERS; i++) {
         if (total_size > i*chunk_array->chunk_size) {
             chunk_array->n_buffers++;
-            chunk_array->buffers[i] = buffer_create(chunk_array->chunk_size);
-            chunk_array->buffers[i]->init_pos = i*chunk_array->chunk_size;
+            chunk_array->buffers[i] = buffer_create(chunk_array->chunk_size, i*chunk_array->chunk_size);
         } else {
             break;
         }
@@ -124,16 +130,28 @@ chunk_array_t* chunk_array_create(char* filename, size_t total_size) {
 }
 
 buffer_t* chunk_array_update(chunk_array_t* chunk_array, size_t pos) {
-    buffer_t* buffer = chunk_array->buffers[0];
-    int distance = abs(buffer->init_pos - pos);
+    ////printf("[%s] miss: %d\n",chunk_array->filename, pos);
+    //buffer_t* buffer = chunk_array->buffers[0];
+    //int distance = abs(buffer->init_pos - pos);
+
+    srand(time(NULL));   // Initialization, should only be called once.
+    int random = rand()%chunk_array->n_buffers;
+
+    while (random == chunk_array->last_updated) {
+        //printf("ACA!\n");
+        random = rand()%chunk_array->n_buffers;
+    }
 
-    for(int i=1; i<chunk_array->n_buffers; i++) {
+    chunk_array->last_updated = random;
+
+    /*for(int i=1; i<chunk_array->n_buffers; i++) {
         int new_distance = abs(chunk_array->buffers[i]->init_pos - pos);
         if (new_distance < distance) {
             distance = new_distance;
             buffer = chunk_array->buffers[i];
         }
-    }
+    }*/
+    buffer_t* buffer = chunk_array->buffers[random];
     buffer_update(chunk_array, buffer, pos);
     return buffer;
 }
@@ -150,6 +168,7 @@ bool chunk_array_get(chunk_array_t* chunk_array, size_t pos, double *valor) {
     for (int i = 0; i<chunk_array->n_buffers; i++) {
         if (inside_buffer(chunk_array, chunk_array->buffers[i]->init_pos, pos)) {
             buffer = chunk_array->buffers[i];
+            break;
         }
     }
 
@@ -177,6 +196,7 @@ bool chunk_array_save(chunk_array_t* chunk_array, size_t pos, double valor) {
     for (int i = 0; i<chunk_array->n_buffers; i++) {
         if (inside_buffer(chunk_array, chunk_array->buffers[i]->init_pos, pos)) {
             buffer = chunk_array->buffers[i];
+            break;
         }
     }