diff --git a/src/gausskernel/cbb/instruments/percentile/percentile.cpp b/src/gausskernel/cbb/instruments/percentile/percentile.cpp
index 04122c37d..da38ac0b8 100755
--- a/src/gausskernel/cbb/instruments/percentile/percentile.cpp
+++ b/src/gausskernel/cbb/instruments/percentile/percentile.cpp
@@ -222,6 +222,7 @@ NON_EXEC_STATIC void PercentileMain()
         g_instance.stat_cxt.force_process = false;
         sleep(SLEEP_INTERVAL);
     }
+    elog(LOG, "instrumention percentile ended");
     gs_thread_exit(0);
 }