X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/23f5bf52cc58cf837840f231cf638e9fcd45097b..d947ff7466b473eeec602007934f8336a9b17f3c:/src/mc/mc_compare.c

diff --git a/src/mc/mc_compare.c b/src/mc/mc_compare.c
index 0333affd90..f016ad3550 100644
--- a/src/mc/mc_compare.c
+++ b/src/mc/mc_compare.c
@@ -10,14 +10,11 @@
 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_compare, mc,
                                 "Logging specific to mc_compare");
 
-static int data_bss_program_region_compare(void *d1, void *d2, size_t size);
-static int data_bss_libsimgrid_region_compare(void *d1, void *d2, size_t size);
 static int heap_region_compare(void *d1, void *d2, size_t size);
 
 static int compare_stack(stack_region_t s1, stack_region_t s2, void *sp1, void *sp2, void *heap1, void *heap2, xbt_dynar_t equals);
 static int is_heap_equality(xbt_dynar_t equals, void *a1, void *a2);
 static size_t heap_ignore_size(void *address);
-static size_t data_bss_ignore_size(void *address);
 
 static void stack_region_free(stack_region_t s);
 static void heap_equality_free(heap_equality_t e);
@@ -45,84 +42,66 @@ static size_t heap_ignore_size(void *address){
   return 0;
 }
 
-static size_t data_bss_ignore_size(void *address){
-  unsigned int cursor = 0;
-  int start = 0;
-  int end = xbt_dynar_length(mc_data_bss_comparison_ignore) - 1;
-  mc_data_bss_ignore_variable_t var;
-
-  while(start <= end){
-    cursor = (start + end) / 2;
-    var = (mc_data_bss_ignore_variable_t)xbt_dynar_get_as(mc_data_bss_comparison_ignore, cursor, mc_data_bss_ignore_variable_t);
-    if(var->address == address)
-      return var->size;
-    if(var->address < address)
-      start = cursor + 1;
-    if(var->address > address)
-      end = cursor - 1;   
-  }
-
-  return 0;
-}
+static int compare_global_variables(int region_type, void *d1, void *d2){
 
-static int data_bss_program_region_compare(void *d1, void *d2, size_t size){
-
-  size_t i = 0;
-  int pointer_align;
-  void *addr_pointed1 = NULL, *addr_pointed2 = NULL;
-  
-  for(i=0; i<size; i++){
-    if(memcmp(((char *)d1) + i, ((char *)d2) + i, 1) != 0){
-      pointer_align = (i / sizeof(void*)) * sizeof(void*);
-      addr_pointed1 = *((void **)((char *)d1 + pointer_align));
-      addr_pointed2 = *((void **)((char *)d2 + pointer_align));
-      if((addr_pointed1 > start_plt_binary && addr_pointed1 < end_plt_binary) || (addr_pointed2 > start_plt_binary && addr_pointed2 < end_plt_binary)){
-        continue;
-      }else{
-        if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_verbose)){
-          XBT_VERB("Different byte (offset=%zu) (%p - %p) in data program region", i, (char *)d1 + i, (char *)d2 + i);
-          XBT_VERB("Addresses pointed : %p - %p\n", addr_pointed1, addr_pointed2);
-        }
-        return 1;
-      }
-    }
-  }
-  
-  return 0;
-}
-
-static int data_bss_libsimgrid_region_compare(void *d1, void *d2, size_t size){
-
-  size_t i = 0, ignore_size = 0;
-  int pointer_align;
+  unsigned int cursor = 0;
+  size_t offset; 
+  int i = 0;
+  global_variable_t current_var; 
+  int pointer_align; 
   void *addr_pointed1 = NULL, *addr_pointed2 = NULL;
 
-  for(i=0; i<size; i++){
-    if(memcmp(((char *)d1) + i, ((char *)d2) + i, 1) != 0){
-      if((ignore_size = data_bss_ignore_size((char *)start_data_libsimgrid+i)) > 0){
-        i = i + ignore_size;
-        continue;
-      }else if((ignore_size = data_bss_ignore_size((char *)start_bss_libsimgrid+i)) > 0){
-        i = i + ignore_size;
+  if(region_type == 1){ /* libsimgrid */
+    xbt_dynar_foreach(mc_global_variables, cursor, current_var){
+      if(current_var->address < start_data_libsimgrid)
         continue;
+      offset = (char *)current_var->address - (char *)start_data_libsimgrid;
+      i = 0;
+      while(i < current_var->size){
+        if(memcmp((char*)d1 + offset + i, (char*)d2 + offset + i, 1) != 0){
+          pointer_align = (i / sizeof(void*)) * sizeof(void*); 
+          addr_pointed1 = *((void **)((char *)d1 + offset + pointer_align));
+          addr_pointed2 = *((void **)((char *)d2 + offset + pointer_align));
+          if((addr_pointed1 > start_plt_libsimgrid && addr_pointed1 < end_plt_libsimgrid) || (addr_pointed2 > start_plt_libsimgrid && addr_pointed2 < end_plt_libsimgrid)){
+            i = current_var->size;
+            continue;
+          }else{
+            if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_verbose)){
+              XBT_VERB("Different global variable in libsimgrid : %s at addresses %p - %p (size = %zu)", current_var->name, (char *)d1+offset, (char *)d2+offset, current_var->size);
+            }
+            return 1;
+          }
+        } 
+        i++;
       }
-      pointer_align = (i / sizeof(void*)) * sizeof(void*);
-      addr_pointed1 = *((void **)((char *)d1 + pointer_align));
-      addr_pointed2 = *((void **)((char *)d2 + pointer_align));
-      if((addr_pointed1 > start_plt_libsimgrid && addr_pointed1 < end_plt_libsimgrid) || (addr_pointed2 > start_plt_libsimgrid && addr_pointed2 < end_plt_libsimgrid)){
-        continue;
-      }else if(addr_pointed1 >= raw_heap && addr_pointed1 <= end_raw_heap && addr_pointed2 >= raw_heap && addr_pointed2 <= end_raw_heap){
-        continue;
-      }else{
-        if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_verbose)){
-          XBT_VERB("Different byte (offset=%zu) (%p - %p) in libsimgrid region", i, (char *)d1 + i, (char *)d2 + i);
-          XBT_VERB("Addresses pointed : %p - %p\n", addr_pointed1, addr_pointed2);
-        }
-        return 1;
+    }
+  }else{ /* binary */
+    xbt_dynar_foreach(mc_global_variables, cursor, current_var){
+      if(current_var->address > start_data_libsimgrid)
+        break;
+      offset = (char *)current_var->address - (char *)start_data_binary;
+      i = 0;
+      while(i < current_var->size){
+        if(memcmp((char*)d1 + offset + i, (char*)d2 + offset + i, 1) != 0){
+          pointer_align = (i / sizeof(void*)) * sizeof(void*); 
+          addr_pointed1 = *((void **)((char *)d1 + offset + pointer_align));
+          addr_pointed2 = *((void **)((char *)d2 + offset + pointer_align));
+          if((addr_pointed1 > start_plt_binary && addr_pointed1 < end_plt_binary) || (addr_pointed2 > start_plt_binary && addr_pointed2 < end_plt_binary)){
+            i = current_var->size;
+            continue;
+          }else{
+            if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_verbose)){
+              XBT_VERB("Different global variable in binary : %s", current_var->name);
+            }
+            return 1;
+          }
+        } 
+        i++;
       }
+      
     }
   }
-  
+
   return 0;
 }
 
@@ -163,18 +142,40 @@ void heap_equality_free_voidp(void *e){
   heap_equality_free((heap_equality_t) * (void **) e);
 }
 
-int snapshot_compare(mc_snapshot_t s1, mc_snapshot_t s2){
+int SIMIX_pre_mc_compare_snapshots(smx_simcall_t simcall,
+                                   mc_snapshot_t s1, mc_snapshot_t s2){
+  return snapshot_compare(s1, s2, NULL, NULL);
+}
 
-  raw_mem_set = (mmalloc_get_current_heap() == raw_heap);
+int get_heap_region_index(mc_snapshot_t s){
+  int i =0;
+  while(i < s->num_reg){
+    switch(s->regions[i]->type){
+    case 0:
+      return i;
+      break;
+    default:
+      i++;
+      break;
+    }
+  }
+  return -1;
+}
+
+int snapshot_compare(mc_snapshot_t s1, mc_snapshot_t s2, mc_comparison_times_t ct1, mc_comparison_times_t ct2){
+
+  int raw_mem = (mmalloc_get_current_heap() == raw_heap);
   
   MC_SET_RAW_MEM;
-
+      
   int errors = 0, i = 0;
 
   if(s1->num_reg != s2->num_reg){
     if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_verbose)){
       XBT_VERB("Different num_reg (s1 = %u, s2 = %u)", s1->num_reg, s2->num_reg);
     }
+    if(!raw_mem)
+      MC_UNSET_RAW_MEM;
     return 1;
   }
 
@@ -202,27 +203,62 @@ int snapshot_compare(mc_snapshot_t s1, mc_snapshot_t s2){
     }
   }
 
+  if(ct1 != NULL)
+    ct1->nb_comparisons++;
+  if(ct2 != NULL)
+    ct2->nb_comparisons++;
+
+  xbt_os_timer_t global_timer = xbt_os_timer_new();
+  xbt_os_timer_t timer = xbt_os_timer_new();
+
+  xbt_os_timer_start(global_timer);
+
+  if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_debug))
+    xbt_os_timer_start(timer);
+
   /* Compare number of blocks/fragments used in each heap */
   size_t chunks_used1 = mmalloc_get_chunks_used((xbt_mheap_t)s1->regions[heap_index]->data);
   size_t chunks_used2 = mmalloc_get_chunks_used((xbt_mheap_t)s2->regions[heap_index]->data);
   if(chunks_used1 != chunks_used2){
     if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_debug)){
+      xbt_os_timer_stop(timer);
+      if(ct1 != NULL)
+        xbt_dynar_push_as(ct1->chunks_used_comparison_times, double, xbt_os_timer_elapsed(timer));
+      if(ct2 != NULL)
+        xbt_dynar_push_as(ct2->chunks_used_comparison_times, double, xbt_os_timer_elapsed(timer));
       XBT_DEBUG("Different number of chunks used in each heap : %zu - %zu", chunks_used1, chunks_used2);
       errors++;
     }else{
       if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_verbose))
         XBT_VERB("Different number of chunks used in each heap : %zu - %zu", chunks_used1, chunks_used2);
-      if(!raw_mem_set)
+     
+      xbt_os_timer_free(timer);
+      xbt_os_timer_stop(global_timer);
+      if(ct1 != NULL)
+        xbt_dynar_push_as(ct1->snapshot_comparison_times, double, xbt_os_timer_elapsed(global_timer));
+      if(ct2 != NULL)
+        xbt_dynar_push_as(ct2->snapshot_comparison_times, double, xbt_os_timer_elapsed(global_timer));
+      xbt_os_timer_free(global_timer);
+
+      if(!raw_mem)
         MC_UNSET_RAW_MEM;
+
       return 1;
     }
+  }else{
+    if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_debug))
+      xbt_os_timer_stop(timer);
   }
+  
+  if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_debug))
+    xbt_os_timer_start(timer);
 
   /* Compare size of stacks */
   unsigned int cursor = 0;
   void *addr_stack1, *addr_stack2;
   void *sp1, *sp2;
   size_t size_used1, size_used2;
+  int is_diff = 0;
   while(cursor < xbt_dynar_length(stacks_areas)){
     addr_stack1 = (char *)s1->regions[heap_index]->data + ((char *)((stack_region_t)xbt_dynar_get_as(stacks_areas, cursor, stack_region_t))->address - (char *)std_heap);
     addr_stack2 = (char *)s2->regions[heap_index]->data + ((char *)((stack_region_t)xbt_dynar_get_as(stacks_areas, cursor, stack_region_t))->address - (char *)std_heap);
@@ -232,54 +268,111 @@ int snapshot_compare(mc_snapshot_t s1, mc_snapshot_t s2){
     size_used2 = ((stack_region_t)xbt_dynar_get_as(stacks_areas, cursor, stack_region_t))->size - ((char*)sp2 - (char*)addr_stack2);
     if(size_used1 != size_used2){
       if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_debug)){
+        if(is_diff == 0){
+          xbt_os_timer_stop(timer);
+          if(ct1 != NULL)
+            xbt_dynar_push_as(ct1->stacks_sizes_comparison_times, double, xbt_os_timer_elapsed(timer));
+          if(ct2 != NULL)
+            xbt_dynar_push_as(ct2->stacks_sizes_comparison_times, double, xbt_os_timer_elapsed(timer));
+        }
         XBT_DEBUG("Different size used in stacks : %zu - %zu", size_used1, size_used2);
         errors++;
+        is_diff = 1;
       }else{
         if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_verbose))
           XBT_VERB("Different size used in stacks : %zu - %zu", size_used1, size_used2);
-        if(!raw_mem_set)
+ 
+        xbt_os_timer_free(timer);
+        xbt_os_timer_stop(global_timer);
+        if(ct1 != NULL)
+          xbt_dynar_push_as(ct1->snapshot_comparison_times, double, xbt_os_timer_elapsed(global_timer));
+        if(ct2 != NULL)
+          xbt_dynar_push_as(ct2->snapshot_comparison_times, double, xbt_os_timer_elapsed(global_timer));
+        xbt_os_timer_free(global_timer);
+
+        if(!raw_mem)
           MC_UNSET_RAW_MEM;
+
         return 1;
       }
     }
     cursor++;
   }
 
+  if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_debug)){
+    if(is_diff == 0)
+      xbt_os_timer_stop(timer);
+    xbt_os_timer_start(timer);
+  }
 
-  /* Compare program data segment(s) */
-  i = data_program_index;
-  while(i < s1->num_reg && s1->regions[i]->type == 2){
-    if(data_bss_program_region_compare(s1->regions[i]->data, s2->regions[i]->data, s1->regions[i]->size) != 0){
-      if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_debug)){
-        XBT_DEBUG("Different memcmp for data in program");
-        errors++;
-      }else{
-        if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_verbose))
-          XBT_VERB("Different memcmp for data in program"); 
-        if(!raw_mem_set)
-          MC_UNSET_RAW_MEM;
-        return 1;
-      }
+  /* Compare binary global variables */
+  is_diff = compare_global_variables(s1->regions[data_program_index]->type, s1->regions[data_program_index]->data, s2->regions[data_program_index]->data);
+  if(is_diff != 0){
+    if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_debug)){
+      xbt_os_timer_stop(timer);
+      if(ct1 != NULL)
+        xbt_dynar_push_as(ct1->binary_global_variables_comparison_times, double, xbt_os_timer_elapsed(timer));
+      if(ct2 != NULL)
+        xbt_dynar_push_as(ct2->binary_global_variables_comparison_times, double, xbt_os_timer_elapsed(timer));
+      XBT_DEBUG("Different global variables in binary"); 
+      errors++; 
+    }else{
+      if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_verbose))
+        XBT_VERB("Different global variables in binary"); 
+    
+      xbt_os_timer_free(timer);
+      xbt_os_timer_stop(global_timer);
+      if(ct1 != NULL)
+        xbt_dynar_push_as(ct1->snapshot_comparison_times, double, xbt_os_timer_elapsed(global_timer));
+      if(ct2 != NULL)
+        xbt_dynar_push_as(ct2->snapshot_comparison_times, double, xbt_os_timer_elapsed(global_timer));
+      xbt_os_timer_free(global_timer);
+    
+      if(!raw_mem)
+        MC_UNSET_RAW_MEM;
+      return 1;
     }
-    i++;
   }
 
-  /* Compare libsimgrid data segment(s) */
-  i = data_libsimgrid_index;
-  while(i < s1->num_reg && s1->regions[i]->type == 1){
-    if(data_bss_libsimgrid_region_compare(s1->regions[i]->data, s2->regions[i]->data, s1->regions[i]->size) != 0){
-      if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_debug)){
-        XBT_DEBUG("Different memcmp for data in libsimgrid");
-        errors++;
-      }else{
-        if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_verbose))
-          XBT_VERB("Different memcmp for data in libsimgrid");
-        if(!raw_mem_set)
-          MC_UNSET_RAW_MEM;
-        return 1;
-      }
+  if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_debug)){
+    if(is_diff == 0)
+      xbt_os_timer_stop(timer);
+    xbt_os_timer_start(timer);
+  }
+
+  /* Compare libsimgrid global variables */
+  is_diff = compare_global_variables(s1->regions[data_libsimgrid_index]->type, s1->regions[data_libsimgrid_index]->data, s2->regions[data_libsimgrid_index]->data);
+  if(is_diff != 0){
+    if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_debug)){
+      xbt_os_timer_stop(timer);
+      if(ct1 != NULL)
+        xbt_dynar_push_as(ct1->libsimgrid_global_variables_comparison_times, double, xbt_os_timer_elapsed(timer));
+      if(ct2 != NULL)
+        xbt_dynar_push_as(ct2->libsimgrid_global_variables_comparison_times, double, xbt_os_timer_elapsed(timer));
+      XBT_DEBUG("Different global variables in libsimgrid"); 
+      errors++; 
+    }else{
+      if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_verbose))
+        XBT_VERB("Different global variables in libsimgrid"); 
+    
+      xbt_os_timer_free(timer);
+      xbt_os_timer_stop(global_timer);
+      if(ct1 != NULL)
+        xbt_dynar_push_as(ct1->snapshot_comparison_times, double, xbt_os_timer_elapsed(global_timer));
+      if(ct2 != NULL)
+        xbt_dynar_push_as(ct2->snapshot_comparison_times, double, xbt_os_timer_elapsed(global_timer));
+      xbt_os_timer_free(global_timer);
+    
+      if(!raw_mem)
+        MC_UNSET_RAW_MEM;
+      return 1;
     }
-    i++;
+  }  
+
+  if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_debug)){
+    if(is_diff == 0)
+      xbt_os_timer_stop(timer);
+    xbt_os_timer_start(timer);
   }
 
   /* Compare heap */
@@ -292,26 +385,47 @@ int snapshot_compare(mc_snapshot_t s1, mc_snapshot_t s2){
   if(mmalloc_compare_heap((xbt_mheap_t)s1->regions[heap_index]->data, (xbt_mheap_t)s2->regions[heap_index]->data, &stacks1, &stacks2, &equals)){
 
     if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_debug)){
+      xbt_os_timer_stop(timer);
+      if(ct1 != NULL)
+        xbt_dynar_push_as(ct1->heap_comparison_times, double, xbt_os_timer_elapsed(timer));
+      if(ct2 != NULL)
+        xbt_dynar_push_as(ct2->heap_comparison_times, double, xbt_os_timer_elapsed(timer));
       XBT_DEBUG("Different heap (mmalloc_compare)");
       errors++;
     }else{
 
+      xbt_os_timer_free(timer);
       xbt_dynar_free(&stacks1);
       xbt_dynar_free(&stacks2);
       xbt_dynar_free(&equals);
  
       if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_verbose))
         XBT_VERB("Different heap (mmalloc_compare)");
-      if(!raw_mem_set)
+       
+      xbt_os_timer_stop(global_timer);
+      if(ct1 != NULL)
+        xbt_dynar_push_as(ct1->snapshot_comparison_times, double, xbt_os_timer_elapsed(global_timer));
+      if(ct2 != NULL)
+        xbt_dynar_push_as(ct2->snapshot_comparison_times, double, xbt_os_timer_elapsed(global_timer));
+      xbt_os_timer_free(global_timer);
+
+      if(!raw_mem)
         MC_UNSET_RAW_MEM;
       return 1;
     } 
+  }else{
+    if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_debug))
+      xbt_os_timer_stop(timer);
   }
 
+  if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_debug))
+    xbt_os_timer_start(timer);
+
   /* Stacks comparison */
   cursor = 0;
   stack_region_t stack_region1, stack_region2;
   int diff = 0, diff_local = 0;
+  is_diff = 0;
 
   while(cursor < xbt_dynar_length(stacks1)){
     stack_region1 = (stack_region_t)(xbt_dynar_get_as(stacks1, cursor, stack_region_t));
@@ -324,8 +438,16 @@ int snapshot_compare(mc_snapshot_t s1, mc_snapshot_t s2){
       diff_local = compare_local_variables(((mc_snapshot_stack_t)xbt_dynar_get_as(s1->stacks, cursor, mc_snapshot_stack_t))->local_variables->data, ((mc_snapshot_stack_t)xbt_dynar_get_as(s2->stacks, cursor, mc_snapshot_stack_t))->local_variables->data, equals);
       if(diff_local > 0){
         if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_debug)){
+          if(is_diff == 0){
+            xbt_os_timer_stop(timer);
+            if(ct1 != NULL)
+              xbt_dynar_push_as(ct1->stacks_comparison_times, double, xbt_os_timer_elapsed(timer));
+            if(ct2 != NULL)
+              xbt_dynar_push_as(ct2->stacks_comparison_times, double, xbt_os_timer_elapsed(timer));
+          }
           XBT_DEBUG("Different local variables between stacks %d", cursor + 1);
           errors++;
+          is_diff = 1;
         }else{
           xbt_dynar_free(&stacks1);
           xbt_dynar_free(&stacks2);
@@ -334,7 +456,15 @@ int snapshot_compare(mc_snapshot_t s1, mc_snapshot_t s2){
           if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_verbose))
             XBT_VERB("Different local variables between stacks %d", cursor + 1);
           
-          if(!raw_mem_set)
+          xbt_os_timer_free(timer);
+          xbt_os_timer_stop(global_timer);
+          if(ct1 != NULL)
+            xbt_dynar_push_as(ct1->snapshot_comparison_times, double, xbt_os_timer_elapsed(global_timer));
+          if(ct2 != NULL)
+            xbt_dynar_push_as(ct2->snapshot_comparison_times, double, xbt_os_timer_elapsed(global_timer));
+          xbt_os_timer_free(global_timer);
+          
+          if(!raw_mem)
             MC_UNSET_RAW_MEM;
 
           return 1;
@@ -347,7 +477,20 @@ int snapshot_compare(mc_snapshot_t s1, mc_snapshot_t s2){
   xbt_dynar_free(&stacks1);
   xbt_dynar_free(&stacks2);
   xbt_dynar_free(&equals);
-  if(!raw_mem_set)
+
+  if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_debug))    
+    xbt_os_timer_free(timer);
+
+  if(!XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_debug)){
+    xbt_os_timer_stop(global_timer);
+    if(ct1 != NULL)
+      xbt_dynar_push_as(ct1->snapshot_comparison_times, double, xbt_os_timer_elapsed(global_timer));
+    if(ct2 != NULL)
+      xbt_dynar_push_as(ct2->snapshot_comparison_times, double, xbt_os_timer_elapsed(global_timer));
+  }
+  xbt_os_timer_free(global_timer);
+
+  if(!raw_mem)
     MC_UNSET_RAW_MEM;
 
   return errors > 0;
@@ -364,18 +507,18 @@ static int is_stack_ignore_variable(char *frame, char *var_name){
   while(start <= end){
     cursor = (start + end) / 2;
     current_var = (mc_stack_ignore_variable_t)xbt_dynar_get_as(mc_stack_comparison_ignore, cursor, mc_stack_ignore_variable_t);
-    if(strcmp(current_var->frame, frame) == 0){
+    if(strcmp(current_var->frame, frame) == 0 || strcmp(current_var->frame, "*") == 0){
       if(strcmp(current_var->var_name, var_name) == 0)
         return 1;
       if(strcmp(current_var->var_name, var_name) < 0)
         start = cursor + 1;
       if(strcmp(current_var->var_name, var_name) > 0)
         end = cursor - 1;
-    }
-  if(strcmp(current_var->frame, frame) < 0)
+    }else if(strcmp(current_var->frame, frame) < 0){
       start = cursor + 1;
-  if(strcmp(current_var->frame, frame) > 0)
+    }else if(strcmp(current_var->frame, frame) > 0){
       end = cursor - 1; 
+    }
   }
 
   return 0;
@@ -398,8 +541,6 @@ static int compare_local_variables(char *s1, char *s2, xbt_dynar_t heap_equals){
       if((strcmp(xbt_dynar_get_as(s_tokens1, 0, char *), "ip") == 0) && (strcmp(xbt_dynar_get_as(s_tokens2, 0, char *), "ip") == 0)){
         ip1 = strdup(xbt_dynar_get_as(s_tokens1, 1, char *));
         ip2 = strdup(xbt_dynar_get_as(s_tokens2, 1, char *));
-        /*if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_verbose))
-          XBT_VERB("Instruction pointer : %s, Instruction pointer : %s", ip1, ip2);*/
       }
       if(strcmp(xbt_dynar_get_as(s_tokens1, 1, char *), xbt_dynar_get_as(s_tokens2, 1, char *)) != 0){   
         /* Ignore this variable ?  */
@@ -413,7 +554,7 @@ static int compare_local_variables(char *s1, char *s2, xbt_dynar_t heap_equals){
         addr2 = (void *) strtoul(xbt_dynar_get_as(s_tokens2, 1, char *), NULL, 16);
         if(is_heap_equality(heap_equals, addr1, addr2) == 0){
           if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_verbose))
-            XBT_VERB("Variable %s is different between stacks : %s - %s", xbt_dynar_get_as(s_tokens1, 0, char *), xbt_dynar_get_as(s_tokens1, 1, char *), xbt_dynar_get_as(s_tokens2, 1, char *));
+            XBT_VERB("Variable %s is different between stacks in %s : %s - %s", xbt_dynar_get_as(s_tokens1, 0, char *), ip1, xbt_dynar_get_as(s_tokens1, 1, char *), xbt_dynar_get_as(s_tokens2, 1, char *));
           xbt_dynar_free(&s_tokens1);
           xbt_dynar_free(&s_tokens2);
           return 1;
@@ -491,6 +632,8 @@ static int compare_stack(stack_region_t s1, stack_region_t s2, void *sp1, void *
 }
 
 int MC_compare_snapshots(void *s1, void *s2){
+  
+  MC_ignore_stack("self", "simcall_BODY_mc_snapshot");
 
   return simcall_mc_compare_snapshots(s1, s2);