Program Buffer - High Number of Swaps

Hi All,
We experiencing high number of program buffer swaps per day, they usually get into 500,000 - 700,000 range. Our abap/buffersize is 500,000 KB. It seems like the general suggestion of the buffersize is that it should be somewhere between 300-700 MB, which I thought 500 would be enough, at least enough no to have such huge numbers of swaps per day. The PHYS_MEMSIZE = 9057, as we have 16 GB of total server memory and 9 is dedicated to SAP, while the other 7 is to SQL Server. I have followed the note about zero admin memory management so other than PHYS_MEMSIZE parameter I don't think I have any memory restricting parameters in there.
In ST06 I always seem to have about 3 GB or physical memory free. We have release 640.
ST02 shows high number of objects swapped, and frames swapped always seem to be at 0. Looking at the buffer history, it seems like we always have only about 1500KB free space out of 500000KB, and the directories free are always around 114000. This makes me think that I should increase the buffer size, however maybe someone can suggest another reason why I have this scenario.
Thank you in advance,
Sergiy

Hi,
Yes, increase your Abap buffer size. 500 MB is much too small.
On our old R/3 4.7 systems we need to allocate 1 GB for the Abap buffer.
We put also 1 GB as a minimum for new Netweaver 7.0 systems...
Regards,
Olivier

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Swaps on program buffer

Hello all,
I am trying to figure out why we started having many swaps in program buffer on ST02 and I found this on history that is quite strange.
It appears that Free storage is bigger than available storage!! Few months ago that we had the same issue, we started having again hundreds of swaps on this buffer. Could someone explain what this Free storage shows and probably suggest how to find the root cause of the issue?
Thanks!

Hi Mik ASp,
See this link is usefully
ST02 - Explaining SAP buffer history statistics (IRDB buffer)
Regards,
Deva

Program Buffer swap

Hi Techies
In our Production servers i found that Program buffer swap are more around 10 thousand swaps
I have restarted the server twice but still after two days again the swap are increased ( only the program buffer swaps are more) and moreover hitratio is 99% and no performance issue .
abap/buffersize 512000
what shall i do shall increase the program buffer size to reduce the swaps
Thank You
Haroon
Edited by: virtualharoon on Aug 14, 2009 7:15 AM

Hi techies
thanks for the reply techies
I have configured the logon load balancing, i have 10 application servers ,As per suggestions i will increase the paramater to 600MB. will that be oK
Will this parameter has any dependencies(abap/buffersize)
Awaiting for the reply
ENV
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Oracle
Memory : 50 GB

Swaps in Program Buffer

Hi Gurus,
When should we tune buffer parameters?.
For example: Swaps for program buffer are 90,000. In which case we have to tune the program buffer?. I know there is no threshold or thumb rule for swaps in SAP system. What will be the base point to tune buffer parameters to reduce swaps?
Thanks in advance
A.S.K

Hi Siva,
Check this link out:
http://help.sap.com/saphelp_sm40/helpdata/en/c4/3a6ecc505211d189550000e829fbbd/content.htm
and
http://help.sap.com/saphelp_sm40/helpdata/en/c4/3a6f00505211d189550000e829fbbd/content.htm
Please award points accordingly.
Regards.
Ruchit.

Regarding program buffer

hi sapgurus,
in st02 ,i checked that the hit ratio of the program buffer is 73%
in st06 my current swap size is 34,830,140 30,414,708 25,600,000
the parameter abap/buffersize has certain values
parmeter value 700000
unsubstited standard value-150000
substituted value -150000
comment
#old_value :550000
i want to increase the hit ratio up 99%
what is change i have to do,and which value i have to change and how much.
please it is bit urgent
the windows 64bit machine and the sap release 700
please do help to get result
regards
rahul

Based on what logic do you raise it to these values?
You have no idea as to the modules used within the system.
You have no idea as to the number of users on the system.
You have no idea as to the number of app servers.
You have no idea as to how load balancing is happening (SMLG).
You have no idea as to the amount of memory in the server.
Before changing anything we need to understand why we have a hit rate of only 73% in the first place, Then and only then do we take the most appropriate action, which may, or may not be changing the value stated.
This is from a app server thats part of a SAP system for 11,000 users on Z-OS
abap/heap_area_dia                          10000000
abap/heaplimit                              10000000
abap/heap_area_nondia                       10000000
<b>abap/buffersize                             900000</b>
rsdb/cua/buffersize                         30000
sap/bufdir_entries                          9000
zcsa/presentation_buffer_area               120000000
zcsa/table_buffer_area                      280000000
zcsa/db_max_buftab                          60000
My point is dont just change it, correct the problem! it doesnt need to be the bigest number you can think of or get away with. it needs to be balanced.
My hit ratio is 99.96 and i wager with 1000s more users.
      Buffer            Hitratio   Allocated         Free space        Dir. size      Free directory         Swaps
                           [%]       [kB]         [kB]         [%]      Entries      Entries       [%]
Program                   99.96       927,192       24,194     2.69       225,000      206,972    91.99        11,796
The hit ratio is of what has been provided by the buffer rather than by direct DB access. However the buffer could well have been paged out to disk millions of times and still indicate a 99.9% rate.
Ask yourself are you doing new things, are you doing them for the first time since a reboot?

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Thank you!

"Does the instance with the high counts receive more traffic than the other instances? Is it possible that the load balancer not
working the way it should be?"
How can I get that information? I can't see metrics for a specific instance
"Does it always happen to the first instance?"
I will check it better, but in the order given by the Processes panel it's the second instance which has the issue. The scaling is at 2 instances for the most part of the time (it's the minimum).
Maybe one time it was the 3th instance but I'm not sure, I'll give it more attention.
" How long do these moment last?"
The time can be 10 to 30 minutes, but I fix it as soon as I see the problem. It's not the down-scaling to resolve it because in these situations the CPU as well is high so the scaling holds or increases the number of instances.
"- How often do these moments occurs?"
It occurs quite often, 2/4 times a week.

Program buffer

Dear all,
We are using R/3 4.6C on HP-UX 11.0 with Oracle 9.2.0.5 and kernel sup. package 2039. On this server we have two production R/3 instances. Server has 8 CPUs, and 8GB RAM, with defined swap of 20GB.
Can You PLS explain:
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I'm not sure what are the steps to increase the program buffer, and how much should it be increased?
Thank you in advance.
Regards,
Ruzica

Hi Ruzica,
Have you seen OSS note 103747 which describes the recommended parameter settings for 40B and above ?
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You mentioned that you have two instances on the one server. Is this the CI and one application server for the SAP system or is it two separate SAP systems (i.e. separate SIDs) ?
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Gary

Tables with more than one cell with a high number of rowspan (ej. 619). This cell can not be print in a page and it must be cut. But I don't know how indesign can do this action.

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set the wake-on lan on the main computer
The laptop's too far away from the router to be connected by ethernet. It's all wifi.
No separate server app on the laptop, it's all samba
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Last edited by saft (2010-03-18 20:38:08)

I want to create a HD disc with my Adobe Premier Elements but I am getting low resolution. When I go to share the DVD to disc the form only offers 8pixels at the bottom. How do I burn this DVD in HD with higher number of pixels?

I want to create a HD disc with my Adobe Premier Elements but I am getting low resolution. When I go to share the DVD to disc the form only offers 8pixels at the bottom. How do I burn this DVD in HD with higher number of pixels? I have read other forums on burning HD DVD's but I do not see the option to turn the 8 pi into 40 pi the one forum recommended. I want my DVD to be HD so I may sell these videos online for my business. I can't sell them the low quality they are burning now. Hopefully you can help me. Thanks.

desalvom
Thank you for your reply.
You cannot burn your high resolution video that you can view on your computer to an AVCHD on DVD disc
that will replay through a regular DVD player. But players are marketed under a variety of names with
different support opportunities. One manufacturer may call its product MultiMedia Player, media player, Blu-ray player,
etc.The bottom line is the specifications for each of the players that are candidates for the playback of
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If you upload your HD (1920 x 1080) video to YouTube, YouTube converts the video to flash format, but it goes up as the HD video.
But, beware. Look at the YouTube viewing setting when your uploaded video is playing back. The YouTube default is not
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Best results depend on you
a. setting up the Premiere Elements project preset to match the properties of the source media. That means, if
you have 1080p source, you (manually) or the project (automatically) set the project preset at
NTSC
DSLR
1080p
DSLR [email protected]
or the PAL counterpart, depending on your region need.
b. if you upload your video to YouTube using the Premiere Elements feature, there is a HD preset, but you cannot
customize it.....if you need customization, then you can export your Timeline to a file...in this example
Publish+Share
Computer
AVCHD
with Presets = MP4 H.264 1920 x 1080p30 or PAL counterpart
and then customize the preset under the Advanced Button/Video Tab of that preset. In increase quality, you might look to increase
the Bitrate under Advanced Button/Video Tab settings - without compromising the file size.
Then you would upload that file to YouTube at the YouTube web site.
All of the above are factors that need looking into in order to determine the why for what you wrote
I have published a shortened advertisement video to YouTube- say 5 minutes-
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Often SD video upscaled to HD can present poorly. But, you are dealing with a HD workflow so that should not be introduced into the matter. The setup of the project and
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Thank you. As always, any clarification needed, please do not hesitate to ask.
ATR

What types of problems stem from high number of loaded classes?

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Heap Size: ~2GB
CMSPermGenSweepingEnabled
CMSClassUnloadingEnabled

Take a look at this example and the output:
public class Example {
      * @param args
     public static void main(String[] args) {
          StaticBlocks a = new StaticBlocks();
          StaticBlocks b = new StaticBlocks();
          a = new StaticBlocks();
class StaticBlocks {
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A static init block. Only happens when class is first loaded.
     Instance init block. Happens every time a class is instantiated.
     You instantiated a class!
     Instance init block. Happens every time a class is instantiated.
     You instantiated a class!
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[http://onjava.com/pub/a/onjava/2005/01/26/classloading.html?page=1|http://onjava.com/pub/a/onjava/2005/01/26/classloading.html?page=1]
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You have many options to choose from, so choose the one that you are most comfortable with. If you want to look for a genuine HP part, you can look for HP part number KS526AA.
Let me know if this answered your question.
↙-----------How do I give Kudos?| How do I mark a post as Solved? ----------------↓

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Hello!!
We have had a dump in production. The message is:
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Program Buffer - High Number of Swaps

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