Regd: Screen Buffer size increase

Dear Sir/madam,
We check in ST02. the screen Buffer -   SWAPS are More.
we want to increase the "SCREEN" Buffer size so the Screen Swaps comes down.
Screen buffer
zcsa/presentation_buffer_area    4400000          Byte   Size of screen buffer
sap/bufdir_entries               2000                    Max. number of buffered screens
Which parameter size i have to Increase here 2 Parameters are available. How much we can increase it.
here RAM size is 4GB. Any Formula is available to Increase the Buffer size of the Screen. or other like Program Buffer etc.
Regards
SNB.

Thanks for your Reply.
   Buffer            Hitratio   Allocated         Free space        Dir. size      Free directory         Swaps       Database
                        [%]       [kB]               [kB]         [%]      Entries         Entries       [%]                      accesses
Screen           96.99        4,297          141     3.44         2,000             1,722       86.10         1,506        4,525
if we want to increase we have to increase for both the parameters.
zcsa/presentation_buffer_area       4400000 + 440000 =          4840000 (10%)
sap/bufdir_entries                          2000 + 200 =                   2200   (10%)
What is the difference between thest 2 parameters.
1)                   zcsa/presentation_buffer_area
2)                   sap/bufdir_entries
Do you have any Formula to Handle ST02 Buffer Size Parameter Maintanence.
Regards
SNB.

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Program buffer                   (PXA)
CUA buffer                       (CUA)
Screen buffer                    (PRES)
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In st02, double click on the parameter buffer that faces many swap, for exemple "Screen".
The following tab show you
Size              Allocated        KB
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                  Free             KB
Directory entries Available
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                  Free
This buffer is setup by 2 parameters (you can display them with 'current parameter button'):
zcsa/presentation_buffer_area
sap/bufdir_entries
One parameter is an amount of memory (in Bytes), the other represent a 'maximum number'.
To know if you need more memory place in the buffer or to increase the max number, you need to read the tab on the previous screen.
If the "Size" - "Free" is next to 0, you need to increase zcsa/presentation_buffer_area
If the "Directory entries"-"Free" is next to 0, you need to increase sap/bufdir_entries
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zcsa/presentation_buffer_area = 10000000
sap/bufdir_entries = 10000
If "Size"-"Free" is to 0 and "Directory entries"-"Free" is to 9000, this means you can have 9 times more directory entries but no more memory to hold them.
So, on this system 1000 buffer entries equals to 10Mb of memory.
So if "Objects swapped" is to 2000, just set zcsa/presentation_buffer_area = 10000000 +2*10000000
You don't have to modify sap/bufdir_entries because it can handle 9 more time entries.
If you want to handle in memory as much entries as the maximum directory entries, you could set zcsa/presentation_buffer_area = 10000000 + 9*10000000
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Regards,

Regd: Screen Buffer size increase

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