From df7e142665bcfd39cb5027f13858e51abf82136d Mon Sep 17 00:00:00 2001
From: Oli <olifer97@gmail.com>
Date: Sun, 6 Feb 2022 15:42:52 -0300
Subject: [PATCH] size for full memory analysis

---
 fftma_module/gen/lib_src/chunk_array.c | 35 +++++++++++++-------------
 1 file changed, 17 insertions(+), 18 deletions(-)

diff --git a/fftma_module/gen/lib_src/chunk_array.c b/fftma_module/gen/lib_src/chunk_array.c
index ba3e5fb..e28bfd6 100644
--- a/fftma_module/gen/lib_src/chunk_array.c
+++ b/fftma_module/gen/lib_src/chunk_array.c
@@ -3,8 +3,8 @@
 #include "stdlib.h"
 #include <sys/mman.h>
 
-#define MAX_CHUNK_SIZE 2048*2048
-#define N_BUFFERS 3
+#define MAX_CHUNK_SIZE 33554432*2
+#define N_BUFFERS 8
 
 int min(int value1, int value2) {
     if (value1 < value2) return value1;
@@ -49,11 +49,11 @@ 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) {
     buffer_flush(chunk_array, buffer);
-
-    int new_init = pos/chunk_array->chunk_size;
-    buffer->init_pos = new_init * chunk_array->chunk_size;
-    int mod = get_mod(chunk_array, buffer->init_pos);
+    
     if (chunk_array->mmap_array) {
+        int new_init = pos/chunk_array->chunk_size;
+        buffer->init_pos = new_init * chunk_array->chunk_size;
+        int mod = get_mod(chunk_array, buffer->init_pos);
         memcpy(buffer->data, &chunk_array->mmap_array[buffer->init_pos], mod * sizeof(double));
     }
 }
@@ -90,16 +90,6 @@ chunk_array_t* chunk_array_create(char* filename, size_t total_size) {
 
     chunk_array->chunk_size = min(MAX_CHUNK_SIZE, total_size);
 
-    if (chunk_array->chunk_size*N_BUFFERS < total_size) {
-
-        chunk_array->mmap_array = mmap ( NULL, total_size*sizeof(double), PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, 0, 0 );
-
-        if (chunk_array->mmap_array == NULL) {
-            return NULL;
-        }
-        
-    }
-
     chunk_array->buffers = malloc(sizeof(buffer_t) * N_BUFFERS);
 
     chunk_array->buffers[0] = buffer_create(chunk_array->chunk_size);
@@ -112,19 +102,28 @@ chunk_array_t* chunk_array_create(char* filename, size_t total_size) {
         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 = chunk_array->chunk_size;
+            chunk_array->buffers[i]->init_pos = i*chunk_array->chunk_size;
         } else {
             break;
         }
     }
 
+    if (chunk_array->chunk_size*chunk_array->n_buffers < total_size) {
+
+        chunk_array->mmap_array = mmap ( NULL, total_size*sizeof(double), PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, 0, 0 );
+
+        if (chunk_array->mmap_array == NULL) {
+            return NULL;
+        }
+        
+    }
+
     chunk_array->filename = filename;
     chunk_array->total_size = total_size;
     return chunk_array;
 }
 
 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);