[misc] avoiding mysql error message if ending and sequence command ha…

…s not ended

benchmarks/common_benchmarks.js

@@ -36,7 +36,6 @@ try {
 function Bench() {
   this.dbReady = 0;
   this.reportData = {};
-  this.ended = false;
   this.driverLen = 2;
 
   this.ready = 0;
@@ -192,12 +191,14 @@ function Bench() {
           bench.initFcts[i].call(this, bench.CONN.MARIADB.drv);
         }
       }
+      this.currentNb = 0;
       console.log("initializing test data done");
     },
 
     // called between running benchmarks
     onCycle: function(event) {
-      if (!this.ended) pingAll(connList);
+      this.currentNb++;
+      if (this.currentNb < this.length) pingAll(connList);
       //to avoid mysql2 taking all the server memory
       if (promiseMysql2 && promiseMysql2.clearParserCache) promiseMysql2.clearParserCache();
       if (mysql2 && mysql2.clearParserCache) mysql2.clearParserCache();
@@ -223,7 +224,6 @@ function Bench() {
     onComplete: function() {
       console.log("completed");
       bench.end(bench);
-      this.ended = true;
     }
   });
 }
@@ -251,6 +251,7 @@ Bench.prototype.endConnection = function(conn) {
     console.log(err);
   }
   if (conn.pool) {
+    if (conn.pool.on) conn.pool.on('error', err => {});
     conn.pool.end().catch(err => {
       console.log("ending error for pool '" + conn.desc + "'");
       console.log(err);