Conference cpdev::opencp

671.0. "Digital UNIX questions - RSS, memory etc" by ALFAM7::STREPPEL () Wed Feb 12 1997 12:30

    I am a novice to the capacity planning product. And I am using it on
    Digital UNIX V3.2D. I think it is hard to use as it still looks and
    feels like a VMS product - which is not bad but different. I am trying
    to figure out the following problems:
    1. While editing the class profile for a node I do not understand what
    units the column RSS is measured in. It seems that it is in VAX
    pages(!), as in the session the log the value that is printed is 16
    times the edited value.
    2. How is the average RSS calculated? I know from observation with the
    Performance Advisor the average value for the processes that I study.
    They are not in sync.
    3. CP shows that ~50 of the memory of one system is used. In reality I
    know from various sources that wired memory and the UBC is not taken
    into account. Good, how could I correct this problem? I tried to add
    this memory to the average RSS of one class I am not interested in
    whoch seemed to be rather complicated. I ended up changing the memory
    size of the system by decreasing it with the desired value, which
    resulted in bad reports.
    4. I have a transient process - database server - whose RSS does not
    seem to be considered in the memory usage. At least if I change the
    value the total amount of memory used does not changed.
    5. The number of users shown in the user saturation window seems to be
    the MPL value found in the class profile which seems to be the number
    of process that CP found for that class, right.
    6. What's the relationship between RSS and this MPL number and the
    amount of memory used?
    7. Saturation of memory does not seem to be a resource limit? How can I
    make it one? Does CP take into account that once the memory is
    saturated paging activity starts?
    
    What I will end up doing is develop a model using my experience with
    the customer's environment and trying to validate it with CP, if
    necessary tweaking the model.
    
    Any comments? I just read in another note in this conference that it is
    impossible (or was it very hard) to use CP in a UNIX environment. If
    just questions 1. to 3. could be answered I would be glad.
    
    	Thanks
    		Hartmut

    I recommend that you attend the capacity planning methodology class,
    Feb 24th to 28th look in a earlier note.
    
    steve