diff --git a/drama/src/rev-mc.c b/drama/src/rev-mc.c
index f953563..5cad791 100644
--- a/drama/src/rev-mc.c
+++ b/drama/src/rev-mc.c
@@ -358,19 +358,20 @@ find_row_mask(std::vector<set_t> &sets,
                 while (cur_mask < last_mask && step_count > 0 && !found.load(std::memory_order_relaxed)) {
                     for (int i = std::min(step_count, step); i > 0 && cur_mask < last_mask; --i) {
                         cur_mask = next_bit_permutation(cur_mask);
-                        if (cnt.fetch_add(1) % 10000 == 0) {
-                            fprintf(stderr, "cnt : %5ld\n", cnt.load(std::memory_order_relaxed));
+                        if (cnt.fetch_add(1) % 1000000000 == 0) {
+                            fprintf(stderr, "cnt : %ld, step_count: %5ld\n", cnt.load(std::memory_order_relaxed),
+                                    step_count);
                         }
                     }
                     step_count -= std::min(step_count, step);
 
-                    if (my_pos > g_base_pos) {
+                    if (my_pos > g_base_pos.load(std::memory_order_relaxed)) {
                         std::lock_guard<std::mutex> _(lock);
                         if (my_pos > g_base_pos) {
                             g_base_pos = my_pos;
                             row_mask   = cur_mask;
                         }
-                    } else if (g_base_pos <= g_cur_pos) {
+                    } else if (g_base_pos.load(std::memory_order_relaxed) < g_cur_pos.load(std::memory_order_relaxed)) {
                         std::lock_guard<std::mutex> _(lock);
                         if (g_base_pos < g_cur_pos) {
                             cur_mask = row_mask;