diff --git a/mergeManager.cpp b/mergeManager.cpp
index e82fd57..0500657 100644
--- a/mergeManager.cpp
+++ b/mergeManager.cpp
@@ -32,6 +32,7 @@ mergeManager::~mergeManager() {
   still_running = false;
   pthread_cond_signal(&pp_cond);
   pthread_join(pp_thread, 0);
+  pthread_join(update_progress_pthread, 0);
   pthread_cond_destroy(&pp_cond);
   delete c0;
   delete c1;
@@ -81,7 +82,9 @@ void mergeManager::update_progress(mergeStats * s, int delta) {
       }
     } else if(s->merge_level == 1) { // C0-C1 merge (c0 is continuously growing...)
       if(s->active) {
-        s->in_progress = ((double)(s->bytes_in_large+s->bytes_in_small)) / (double)(s->base_size+fmax(ltable->mean_c0_run_length,(double)s->bytes_in_small));
+	//        s->in_progress = ((double)(s->bytes_in_large+s->bytes_in_small)) / (double)(s->base_size+fmax(ltable->mean_c0_run_length,(double)s->bytes_in_small));
+	s->in_progress = ((double)(s->bytes_in_large+s->bytes_in_small)) / (double)(s->base_size+fmax(c0->target_size,(double)s->bytes_in_small));
+        //s->in_progress = ((double)(s->bytes_in_large+s->bytes_in_small)) / (((double)s->base_size)+(double)s->bytes_in_small);
       } else {
         s->in_progress = 0;
       }
@@ -352,7 +355,7 @@ void mergeManager::update_progress(mergeStats * s, int delta) {
  * bytes_consumed_by_merger = sum(stats_bytes_in_small_delta)
  */
 void mergeManager::tick(mergeStats * s) {
-  if(s->merge_level == 1) { // apply backpressure based on merge progress.
+  if(s && s->merge_level == 1) { // apply backpressure based on merge progress.
     if(s->need_tick) {
       s->need_tick = 0;
       // Only apply back pressure if next thread is not waiting on us.
@@ -377,24 +380,30 @@ void mergeManager::tick(mergeStats * s) {
         rwlc_unlock(ltable->header_mut);
       }
     }
-  } else if(s->merge_level == 0) {
+  } else if((!s) || s->merge_level == 0) {
     // Simple backpressure algorithm based on how full C0 is.
 
     pageid_t cur_c0_sz;
-    // Is C0 bigger than is allowed?
-    while((cur_c0_sz = s->get_current_size()) > ltable->max_c0_size) {  // can't use s->current_size, since this is the thread that maintains that number...
-      printf("\nMEMORY OVERRUN!!!! SLEEP!!!!\n");
-      struct timespec ts;
-      double_to_ts(&ts, 0.1);
-      nanosleep(&ts, 0);
+    if(s) {
+      // Is C0 bigger than is allowed?
+      while((cur_c0_sz = s->get_current_size()) > ltable->max_c0_size) {  // can't use s->current_size, since this is the thread that maintains that number...
+	printf("\nMEMORY OVERRUN!!!! SLEEP!!!!\n");
+	struct timespec ts;
+	double_to_ts(&ts, 0.1);
+	nanosleep(&ts, 0);
+      }
+      // Linear backpressure model
+      s->out_progress = ((double)cur_c0_sz)/((double)ltable->max_c0_size);
+    } else {
+      cur_c0_sz = c0->get_current_size();
     }
-    // Linear backpressure model
-    s->out_progress = ((double)cur_c0_sz)/((double)ltable->max_c0_size);
-    double delta = ((double)cur_c0_sz)/(0.9*(double)ltable->max_c0_size); // 0 <= delta <= 1.111...
+    double delta = ((double)cur_c0_sz)/(0.95*(double)ltable->max_c0_size); // 0 <= delta <= 1.111...
     delta -= 1.0;
     if(delta > 0.00005) {
       double slp = 0.001 + 5.0 * delta; //0.0015 < slp < 1.112111..
-
+      if(!s) {
+	//	printf("sleeping!\n");
+      }
       DEBUG("\nmem sleeping %0.6f tree_megabytes %0.3f\n", slp, ((double)ltable->tree_bytes)/(1024.0*1024.0));
       struct timespec sleeptime;
       double_to_ts(&sleeptime, slp);
@@ -412,7 +421,9 @@ void mergeManager::read_tuple_from_small_component(int merge_level, datatuple *
     (s->stats_bytes_in_small_delta) += tup->byte_length();
 #endif
     (s->bytes_in_small) += tup->byte_length();
-    update_progress(s, tup->byte_length());
+    if(merge_level != 0) {
+      update_progress(s, tup->byte_length());
+    }
     tick(s);
   }
 }
@@ -421,7 +432,9 @@ void mergeManager::read_tuple_from_large_component(int merge_level, int tuple_co
     mergeStats * s = get_merge_stats(merge_level);
     s->num_tuples_in_large += tuple_count;
     s->bytes_in_large += byte_len;
-    update_progress(s, byte_len);
+    if(merge_level != 0) {
+      update_progress(s, byte_len);
+    }
   }
 }
 
@@ -455,7 +468,21 @@ void mergeManager::finished_merge(int merge_level) {
 #endif
   update_progress(get_merge_stats(merge_level), 0);
 }
+void * mergeManager::update_progress_thread() {
+  pthread_mutex_t dummy_mut;
+  pthread_mutex_init(&dummy_mut, 0);
 
+  while(still_running) {
+    struct timeval tv;
+    gettimeofday(&tv, 0);
+    struct timespec ts;
+    double_to_ts(&ts, tv_to_double(&tv)+0.1);
+    pthread_cond_timedwait(&update_progress_cond, &dummy_mut, &ts);
+    //    printf("Calling update progress\n");
+    update_progress(c0,0);
+  }
+  return 0;
+}
 void * mergeManager::pretty_print_thread() {
   pthread_mutex_t dummy_mut;
   pthread_mutex_init(&dummy_mut, 0);
@@ -479,6 +506,10 @@ void * merge_manager_pretty_print_thread(void * arg) {
   mergeManager * m = (mergeManager*)arg;
   return m->pretty_print_thread();
 }
+void * merge_manager_update_progress_thread(void * arg) {
+  mergeManager * m = (mergeManager*)arg;
+  return m->update_progress_thread();
+}
 
 double mergeManager::c1_c2_progress_delta() {
   return c1_c2_delta;
@@ -497,6 +528,7 @@ void mergeManager::init_helper(void) {
   still_running = true;
   pthread_cond_init(&pp_cond, 0);
   pthread_create(&pp_thread, 0, merge_manager_pretty_print_thread, (void*)this);
+  pthread_create(&update_progress_pthread, 0, merge_manager_update_progress_thread, (void*)this);
 }
 
 mergeManager::mergeManager(logtable *ltable):
diff --git a/mergeManager.h b/mergeManager.h
index 264ac9f..e43b0e0 100644
--- a/mergeManager.h
+++ b/mergeManager.h
@@ -60,6 +60,7 @@ public:
   void wrote_tuple(int merge_level, datatuple * tup);
   void pretty_print(FILE * out);
   void *pretty_print_thread();
+  void *update_progress_thread();
 
 private:
   /**
@@ -102,5 +103,7 @@ private:
   bool still_running;
   pthread_cond_t pp_cond;
   pthread_t pp_thread;
+  pthread_cond_t update_progress_cond;
+  pthread_t update_progress_pthread;
 };
 #endif /* MERGEMANAGER_H_ */