How to moniter the max quantity of used dialog work process in SAP system

Dear Gurus,
The quantity of Dia Work Process(DWP) of APP1 is: 16 (rdisp/wp_no_dia=16)
The quantity of Dia Work Process(DWP) of APP2 is: 16 (rdisp/wp_no_dia=16)
The quantity of Dia Work Process(DWP) of APP3 is: 20 (rdisp/wp_no_dia=20)
The quantity of Dia Work Process(DWP) of APP4 is: 20 (rdisp/wp_no_dia=20)
So the quantity of DWP in our SAP system is: 72 (=161620+20).
We have 75 dialog users and many RFC callings via JCO method from J2EE system.
I'm afriad the 72 DWPs will be run out of use someday.
So I want to moniter the max quantity of used DWP every per hour to prevent the situation I mentioned above.
Could you give me some suggestions?
Thank you very much..
Jason

Hi Olivier,
  I really appreciate your help. You told me a very useful clew!
  As the method you told me, I have some questions:
  (a3) Do you restart your 'CI + 6 DIA' separately every week? Why did you do that?
  (a4) How to calculate 'CPU intensive time'?  For example, App server 'APS' was restarted on 8-10-2011 and stopped on 8-20-2011.
There was a DWP(PID 557550) was created and activated on APS during this period(10 days). So If I add up each 'cpu time' of the task
which 557550 executed, I can get the 'CPU intensive time' of 557550 (dispalyed in SM50). Right?
    In other words:
       DWP(PID 557550) finished task1: cpu time = 5ms  8-10-2011
       DWP(PID 557550) finished task2: cpu time = 4ms 
       DWP(PID 557550) finished task3: cpu time = 6ms  8-20-2011
     So the 'CPU intensive time'(Between 8-10-2011 and 8-20-2011) of DWP(PID 557550) is: 15ms (5ms4ms6ms). Right?
  (a5)Can we moniter the 'CPU intensive time' of DWPs in CCMS automatically? (I want to prevent the situation: The DWPs in our entire ECC are occupied.)
Thank you!
                                                                                Jason

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    Dear Gurus,
    The quantity of Dia Work Process(DWP) of APP1 is: 16 (rdisp/wp_no_dia=16)
    The quantity of Dia Work Process(DWP) of APP2 is: 16 (rdisp/wp_no_dia=16)
    The quantity of Dia Work Process(DWP) of APP3 is: 20 (rdisp/wp_no_dia=20)
    The quantity of Dia Work Process(DWP) of APP4 is: 20 (rdisp/wp_no_dia=20)
    So the quantity of DWP in our SAP system is: 72 (=161620+20).
    We have 75 dialog users and many RFC callings via JCO method from J2EE system.
    I'm afriad the 72 DWPs will be run out of use someday.
    So I want to moniter the max quantity of used DWP every per hour to prevent the situation I mentioned above.
    Could you give me some suggestions?
    Thank you very much..
    Jason
    Edited by: jason xu on Aug 22, 2011 6:20 PM

    duplicate thread !!

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