      var url = "${request.contextPath}/admin/app/getAppInstancesMemFragRatioStat.json?appId=" + appId + chartParams;
                  $.ajax({
                    type : "get",
                    url : url,
                    async : false,
                    success : function(data) {
                      var dataArr = eval("(" + data + ")");
                      var length = dataArr.length;
                      for (var i = 0; i < length; i++) {
                        var instance = dataArr[i];
 