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Former Member

Performance tune

Hi team, I'am facing problems with system performance:

My enviorment is:

->Cluster with Intel Xeon 2.80Ghz

->5,50GB RAM

Running Windows Server 2003, and SQL 2005, with ECC5

The Hitratio is fine with values between 93% and 99%, but in the program buffer i´am facing some problems:

The program buffer as 512.000KB alocated , but in 5 hours of activity the free space changes to 1.092Kb with 0,22% , and

the swaps start do grow to 15.0000, the free directory as 115.352 entries / 90,12%

I also get swaps to in the buffer initial records, and in generic key.

In transaction RZ20 the system has the following Alerts:

21.04.2010 11:33:50 PRD SAP_PRD_00 Program Swap ACTIVE 113,300000 /min > 100,000000 /min (15 Min.) SAP buffer swap exceeds threshold

21.04.2010 10:48:50 PRD SAP_PRD_00 Program Swap ACTIVE 207,800000 /min > 100,000000 /min (15 Min.) SAP buffer swap exceeds threshold

21.04.2010 10:33:50 PRD SAP_PRD_00 Program Swap ACTIVE 82,100000 /min > 50,000000 /min (15 Min.) SAP buffer swap exceeds threshold

21.04.2010 09:48:50 PRD SAP_PRD_00 Program SpaceUsed ACTIVE 100 % > 98 % (15 Min.) SAP buffer:buffer storage usage exceeds threshold

21.04.2010 09:18:50 PRD SAP_PRD_00 Program SpaceUsed ACTIVE 92 % > 90 % (15 Min.) SAP buffer:buffer storage usage exceeds threshold

I tried to change the program buffer to 600.000 but the sytem don´t start.

Thanks & Regards,

NG

Edited by: Nuno Gonçalves on Apr 21, 2010 1:55 PM

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2 Answers

  • Best Answer
    Apr 21, 2010 at 12:41 PM

    I tried to change the program buffer to 600.000 but the sytem donĀ“t start.

    Is this 32bit?

    What error message do you get in the workprocess traces when you try to start the system?

    Markus

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    • Former Member Former Member

      Hello - Some additional detail here as the limitation regarding memory stems from the 32-bit hardware restrictions (not experienced in 64-bit)

      Regardless of 32-bit or 640bit usage SAP note 88416 should be in place.

      Zero administration memory management (Note #88416) generally

      over allocates roll and page memory. Usually you can reduce the

      the amounts allocated to the "in memory"

      rdisp/ROLL_MAXFS....Total amount of Roll (Filesystem+SHM); in 8KB block

      rdisp/ROLL_SHM......Shared memory element of Roll; in 8KB blocks

      rdisp/PG_MAXFS......Total amount of Page (Filesystem+SHM); in 8KB block

      rdisp/PG_SHM........Shared memory element of Page; in 8KB blocks

      =>Filesystem amount = MAXFS - SHM

      60MB or so each in memory should be sufficient. rdisp/ROLL_SHM &

      rdisp/PG_SHM only to be changed. This should allow extra

      memory space for process memory.

      These profiles would have to have be added to the instance profiles.

      You should monitor the roll and paging usage after this to ensure that

      more than 80% of each is never used as starting to use the paging

      and roll files very regularly when buffers are exhausted would have

      performance implications. You can check the history of each

      instance's usage of these areas by double-clicking on the values from

      the initial screen of ST02. This could potentially increase

      the available address space per process by about 260MB that would

      otherwise be wasted that will help avoid error with the buffer

      creation and otherwise allow more memory to be available for HEAP

      usage for larger memory intensive reports. These changes do not

      invalidate Zero Adminstration Memory Management usage but are merely

      tweaking the defaults further.

      Again, these are only adjustments and 32-bit limitations still exist obviously.

      931024 FAQ: 64-bit platforms for Windows (explains that a 64-bit instance added would avoid issues)

      Regards.

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    Former Member
    Apr 21, 2010 at 12:16 PM

    Hi,

    Please revert back to buffer old parameters.

    Raise a message with SAP. Is it a new server, did you had Post Go-Live check.

    Cheers

    Deepanshu

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