diff --git a/bench/yakushima.cpp b/bench/yakushima.cpp
index d8c0af5..a0d3f7e 100644
--- a/bench/yakushima.cpp
+++ b/bench/yakushima.cpp
@@ -170,8 +170,14 @@ void parallel_build_tree() {
     }
 }
 
+struct alignas(CACHE_LINE_SIZE) workarea {
+    std::size_t res;
+    bool exhaust = false;
+    std::chrono::system_clock::time_point w_stop;
+};
+
 void get_worker(const size_t thid, char& ready, const bool& start,
-                const bool& quit, std::size_t& res) {
+                const bool& quit, workarea& work) {
     // init work
     Xoroshiro128Plus rnd;
     FastZipf zipf(&rnd, FLAGS_get_skew, FLAGS_initial_record);
@@ -204,11 +210,11 @@ void get_worker(const size_t thid, char& ready, const bool& start,
     performance_tools::get_watch().set_point(1);
 #endif
     leave(token);
-    res = local_res;
+    work.res = local_res;
 }
 
 void scan_worker(const size_t thid, char& ready, const bool& start,
-                 const bool& quit, std::size_t& res) {
+                 const bool& quit, workarea& work) {
     // init work
     Xoroshiro128Plus rnd;
     FastZipf zipf(&rnd, FLAGS_get_skew, FLAGS_initial_record);
@@ -243,11 +249,11 @@ void scan_worker(const size_t thid, char& ready, const bool& start,
     performance_tools::get_watch().set_point(1);
 #endif
     leave(token);
-    res = local_res;
+    work.res = local_res;
 }
 
 void remove_worker(const size_t thid, char& ready, const bool& start,
-                   const bool& quit, std::size_t& res) {
+                   bool& quit, workarea& work) {
     // this function can be used in Linux environment only.
 #ifdef YAKUSHIMA_LINUX
     set_thread_affinity(static_cast<const int>(thid));
@@ -278,8 +284,11 @@ void remove_worker(const size_t thid, char& ready, const bool& start,
         ++local_res;
         if (loadAcquireN(quit)) { break; }
         if (i == right_edge - 1) {
-            LOG(FATAL) << "This experiments fails. Please set less duration or "
+            LOG(ERROR) << "This experiments fails. Please set less duration or "
                           "larger initial record.";
+            work.exhaust = true;
+            work.w_stop = std::chrono::system_clock::now();
+            storeReleaseN(quit, true);
         }
     }
 #ifdef PERFORMANCE_TOOLS
@@ -287,10 +296,10 @@ void remove_worker(const size_t thid, char& ready, const bool& start,
 #endif
 
     leave(token);
-    res = local_res;
+    work.res = local_res;
 }
 void put_worker(const size_t thid, char& ready, const bool& start,
-                const bool& quit, std::size_t& res) {
+                const bool& quit, workarea& work) {
     // this function can be used in Linux environment only.
 #ifdef YAKUSHIMA_LINUX
     set_thread_affinity(static_cast<const int>(thid));
@@ -328,13 +337,13 @@ void put_worker(const size_t thid, char& ready, const bool& start,
 #endif
 
     leave(token);
-    res = local_res;
+    work.res = local_res;
 }
 
 static void invoke_leader() try {
     alignas(CACHE_LINE_SIZE) bool start = false;
     alignas(CACHE_LINE_SIZE) bool quit = false;
-    alignas(CACHE_LINE_SIZE) std::vector<std::size_t> res(FLAGS_thread);
+    alignas(CACHE_LINE_SIZE) std::vector<workarea> work(FLAGS_thread);
 
     LOG(INFO) << "[start] init masstree database.";
     init();
@@ -360,22 +369,23 @@ static void invoke_leader() try {
     for (size_t i = 0; i < FLAGS_thread; ++i) {
         if (FLAGS_instruction == "get") {
             thv.emplace_back(get_worker, i, std::ref(readys[i]),
-                             std::ref(start), std::ref(quit), std::ref(res[i]));
+                             std::ref(start), std::ref(quit), std::ref(work[i]));
         } else if (FLAGS_instruction == "put") {
             thv.emplace_back(put_worker, i, std::ref(readys[i]),
-                             std::ref(start), std::ref(quit), std::ref(res[i]));
+                             std::ref(start), std::ref(quit), std::ref(work[i]));
         } else if (FLAGS_instruction == "remove") {
             thv.emplace_back(remove_worker, i, std::ref(readys[i]),
-                             std::ref(start), std::ref(quit), std::ref(res[i]));
+                             std::ref(start), std::ref(quit), std::ref(work[i]));
         } else if (FLAGS_instruction == "scan") {
             thv.emplace_back(scan_worker, i, std::ref(readys[i]),
-                             std::ref(start), std::ref(quit), std::ref(res[i]));
+                             std::ref(start), std::ref(quit), std::ref(work[i]));
         } else {
             LOG(FATAL) << "invalid instruction type.";
         }
     }
 
     waitForReady(readys);
+    std::chrono::system_clock::time_point w_start{std::chrono::system_clock::now()};
     storeReleaseN(start, true);
     LOG(INFO) << "[start] measurement.";
     for (size_t i = 0; i < FLAGS_duration; ++i) { sleepMs(1000); }
@@ -391,11 +401,17 @@ static void invoke_leader() try {
      */
     std::uint64_t fin_res{0};
     for (std::uint64_t i = 0; i < FLAGS_thread; ++i) {
-        if ((UINT64_MAX - fin_res) < res[i]) {
+        if ((UINT64_MAX - fin_res) < work[i].res) {
             LOG(FATAL)
                     << "experimental setting is bad, which leads to overflow.";
         }
-        fin_res += res[i];
+        fin_res += work[i].res;
+        if (work[i].exhaust) {
+            auto ms = std::chrono::duration_cast<std::chrono::milliseconds>(work[i].w_stop - w_start).count();
+            LOG(FATAL) << "a worker is exhaust its record in " << (ms / 1000.0) << "sec. "
+                       << "Please set duration less than this, "
+                       << "or set initial_record larger than " << (FLAGS_initial_record * FLAGS_duration * 1000 / ms);
+        }
     }
     std::cout << "throughput[ops/s]: " << fin_res / FLAGS_duration << std::endl;
     displayRusageRUMaxrss();