diff --git a/guider/guider.py b/guider/guider.py
index f9acd567..ca391d3e 100755
--- a/guider/guider.py
+++ b/guider/guider.py
@@ -7,7 +7,7 @@
 __credits__ = "Peace Lee"
 __license__ = "GPLv2"
 __version__ = "3.9.8"
-__revision__ = "240817"
+__revision__ = "240818"
 __maintainer__ = "Peace Lee"
 __email__ = "iipeace5@gmail.com"
 __repository__ = "https://github.com/iipeace/guider"
@@ -9582,7 +9582,7 @@ def convDict2Str(dictObj, pretty=True, indent=2, ignore=False):
                 dictObj,
                 indent=indent,
                 ensure_ascii=False,
-                default=(lambda o: "<not serializable>") if ignore else None,
+                default=(lambda o: "<N/A>") if ignore else None,
             )
 
             if pretty:
@@ -48974,13 +48974,24 @@ def _monitorConn(connFd):
             tobj.daemon = True
             tobj.start()
 
+            # define notify function #
+            def _printExecutedCmd():
+                SysMgr.printInfo(
+                    "executed '%s' command from %s" % (cmd, cliProc)
+                )
+
             # set final command #
             cmdList = cmd.split("|")
             mainCmd = cmdList[0]
-            if mainCmd == "dump":
-                SysMgr.printFd = MemoryFile(name="buf")
+            if mainCmd in ("dump", "sysdump"):
+                # summarize monitoring buffer #
                 SysMgr.streamEnable = True
-                TaskAnalyzer.printIntervalUsage(onlySummary=True)
+                SysMgr.printFd = MemoryFile(name="buf")
+                TaskAnalyzer.printIntervalUsage(
+                    onlySummary=True, onlyTotal=mainCmd == "sysdump"
+                )
+
+                # send summary stats in JSON #
                 SysMgr.jsonEnable = True
                 SysMgr.printFd.seek(0)
                 stats, memstat = TaskAnalyzer.getStatsFile(
@@ -48988,11 +48999,24 @@ def _monitorConn(connFd):
                 )
                 SysMgr.printFd = connFd
                 connObj.write(UtilMgr.convDict2Str(stats, pretty=False))
+
+                # print status #
+                _printExecutedCmd()
             elif mainCmd == "monitor":
-                pass
+                # clear buffer #
+                SysMgr.clearProcBuffer()
 
-            # execute a command #
-            SysMgr.printInfo("executed '%s' command from %s" % (cmd, cliProc))
+                # print status #
+                _printExecutedCmd()
+
+                # start sending stats in JSON #
+                SysMgr.jsonEnable = True
+                SysMgr.printFd = connObj
+
+                return
+            else:
+                SysMgr.printErr("no support '%s' command" % mainCmd)
+                sys.exit(0)
 
             # terminate #
             sys.exit(0)
@@ -49413,8 +49437,7 @@ def newHandler(signum=None, frame=None):
             pid = SysMgr.createProcess()
             if pid > 0:
                 # clear buffer as parent #
-                SysMgr.procBufferSize = 0
-                SysMgr.procBuffer = []
+                SysMgr.clearProcBuffer()
 
                 # close an output file to sync #
                 SysMgr.closePrintFd()
@@ -52749,7 +52772,7 @@ def parseRuntimeOption(value):
     @staticmethod
     def reloadFileBuffer(path=None, retFd=False, fd=None):
         # pylint: disable=no-member
-        SysMgr.procBuffer = []
+        SysMgr.clearProcBuffer()
 
         # load raw data from the file #
         try:
@@ -59815,11 +59838,11 @@ def launchGuider(
             SysMgr.groupProcEnable = False
             SysMgr.optionList = []
             ConfigMgr.confData = {}
-            SysMgr.procBuffer = []
             SysMgr.exitFuncList = []
             SysMgr.customCmd = []
             SysMgr.rcmdList = {}
             SysMgr.requestQueue = []
+            SysMgr.clearProcBuffer()
 
             # clear global packages #
             if initPkg:
@@ -120038,8 +120061,7 @@ def _printMemUsage(signum=None, frame=None):
 
                 # clean up #
                 targetFile = SysMgr.printFd.name
-                del SysMgr.procBuffer
-                SysMgr.procBuffer = []
+                SysMgr.clearProcBuffer()
                 SysMgr.printFd = None
                 SysMgr.outPath = origOutput