Lot of swaps Occuring

Hi Experts
We have ECC 6.0 which was upgraded from 4.6c. Everthing went on smooth, except for a major performance issue. Initially when i came into this project i tried a lot of steps like increasing the swap space and stuff where the hit ratio was set due to the change.
Now the issue is that there a lot of swaps occuring and i really do not know where to go from here.i already increased the swap space by around 200MB. Please do advise me on what to do. Generally wht is the best procedure to follow when there are a lot of swaps occuring.
Thanks in advance.

Recommedn you to configure at least 20 gigabytes of swap space in 64-bit systems. (Plus approx. 10 GB for every additional 64-bit instance on the same computer).
Go through these notes for the recommendations
Note 146289 - Parameter Recommendations for 64-Bit SAP Kernel
Note 1009493 - abap/heap_area* Parameter Defaults Changed (64-Bit Windows)

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MERGE INTO CORM_QWD_QUOTE_WUTASK A
USING (SELECT * FROM CORM_QMD_QUOTEMAT) B
ON ( ( A.QWD_ORDER_OU = B.QMD_ORDER_OU
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Hi Gurus,
I have been seeing lot of swaps occuring in ST02,in one our production servers.
I could see the swaps occuring on CUA buffers in huge volumes
Can any body give me any clue on how to go about it,interms of analysing the swaps and fixing the same
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Venu

hello
you will find some help here : [Online help about buffers|http://help.sap.com/erp2005_ehp_04/helpdata/EN/c4/3a6e98505211d189550000e829fbbd/frameset.htm]
"When a buffer has insufficient freespace or free directories, it has to swap objects out of the buffer in order to load a new object. The column Swap shows how many objects have been swapped out since system startup."
This means that you have to increase the size of the buffer to avoid swapping.
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Hi Experts
In my production server lot of swaps in PXA buffers, yesterday only I increased PXA buffer size 240000 to 270000, but still I am getting swaps in that PXA Buffer (ABAP/BufferSize), any body give the how much memory I have to increase to that respective buffers, what is the solution to over come this swap problems in PXA buffer
Best Regards
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Hello,
Increasing the size of buffer swap space depend on hardware configuration of your system.
First check how much total paging space is allocated in your system.
Depending on your hardware configuration you can increase size of buffers.
you can check current value & SAP default value in your system...
check system load in your system. Sometimes due to more load swapping occurs...
If this continuously happens you need to check for all buffers.
You can check in ST02, which buffers are causing more swaps...
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Any specific command or steps to find which process consuming lot of swap space and there is any specific step to reduce the usage without kill the actual process.
Regards,
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prstat -s size
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The RSS column of the prstat output shows how much which is residential, that part is for sure in the RAM, the rest may or may not be swapped out.
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ST02 SWAPS reported what does that mean.

Hi Team,
In ST02 of one of the system all the apps I see many SWAPS column with value and in red color, what it mean
program, swaps with 11,349
generic key with 68
single record with 1,002
Thanks
Vijay

Hi,
ST02 is the buffer monitor that offers instance specific information that provides:
1. status of different buffers instance wise
2. information on memory usage instance wise
3. information on table buffering at instance level
Swapping takes place for two reasons:
1. not enough 'free space left' in buffer for buffering new objects
2. buffer has run ouf of 'free directory entries' that can be contained in one buffer area *
Directory entries diminish the available size of the buffer, independent of their usage.
Swaps are to be avoided, as are all other situations leading to lines shown in red in the ST02 display.
Please note that Buffer swaps occur when buffer content is deleted from the buffer and is replaced by other content. It has no relation at all to the swapping mechanism on OS level.
An example with a more practical outlook to swapping observed:
Use transactions SM50, ST03N and ST02 to identify the problem.
a. Using SM50 you might find high number of work processes accessing tables related to ABAP sources and status as 'Load Program'. This hints to a problem with Program [PXA] buffer.
b. In transaction ST03N, you find unusually high 'load and generation time' causing even higher wait times. Threshold for load and generation time is typically 50 ms.
c. In buffer monitor i.e. ST02, you find many swaps [typically more than 10000 swaps happening per day for program buffer]. Check on hit ratio [value below 95% is typically poor]. This indicates problem. Program buffer could be small!!
If program buffer is small, it means that workprocesses require to reload program loads over and over again which causes bad system performance.
Resolution: Increase program buffer size/ check on load and generation times/ hit-ratio increases/ system response time also lowers down!! : )
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Hi,
I have setup Solaris 10 (x86) on a SunFire V20Z, and mirrored my 2 hds.
raidctl c1t0d0 c1t1d0
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WARNING: /tmp: File system full, swap space limit exceeded
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When i reboot, the system will show the swap as correct, but it will start dropping over a period of time
bash-3.00# swap -l
swapfile dev swaplo blocks free
/dev/dsk/c1t0d0s1 28,65 8 4193272 4193272
bash-3.00# swap -s
total: 565248k bytes allocated + 933124k reserved = 1498372k used, 2280600k available
The next day when i check again;
-bash-3.00$ swap -l
swapfile dev swaplo blocks free
/dev/dsk/c1t0d0s1 28,65 8 4193272 4193272
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swap 8.3MB 4.0K 8.3MB 1% /tmp
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swap - /tmp tmpfs - yes -
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Well, /tmp and swap are tightly connected to eachother, since its basicly the same thing.
Hence, when you allocate space in /tmp, the amount of available swap will drop, in the same way the amount of space available in /tmp will drop if a lot of swap has been allocated by processes running on the system.
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I suspect that you have an application running on your system which is eating a lot of memory and hence using up your swap space, so next time this problem occour, i'ld run the following;
prstat -a -s size
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In SAP training materials, it says that buffer swaps occur when buffer content is deleted from the buffer and is replaced by other content. It's no relation at all to the swapping mechanism on OS level.
I am confused about the source and target of buffer swaps. For example, when buffer swaps occur on program buffer(PXA), where will the data in program buffer be put, physical memory?, and where does new data come from? SAP buffers locate on share memory, belong to virtual memory, but virtual memory is the summary of physical memory and OS swap space(or OS paging file). I just remember that extended memory resides on physical memory, don't know whether sap buffers reside on physical too.
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http://help.sap.com/saphelp_nw70/helpdata/EN/c4/3a6dbb505211d189550000e829fbbd/frameset.htm
as the question you have asked is concentrating in
depth and this can be understood if you have a look
at the following link.
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Hi all,
I have prod and test on the same server on AIX 5.3 box. And application is 11i. It's not a good config but thats the way it is here. And for the last 6 months or so we are getting PGSP_KILL error in AIX log files. My server RAM is 8GB and as per Metalink docs, i first set SWAP SPACE to 0.75 times the RAM but still the same problem. Now i have set SWAP SIZE to same size of RAM(8GB). Still getting the same problem mainly when copying files to tape or taking cold backup. After this happens we get famouus FRM-92050 Failed to connect to server: xxxx.xxxx:9000. ans users can't login.
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Taher

Hi Taher;
Please check below and see its helpful for you
Re: 12.0.4 Upgrade - Performance
Re: Apps R12 now available
SWAP SPACE ON SOLARIS (its your previous post)
Regard
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27" 2010 iMac 16gb RAM...still swapping?

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Ian

Open your Activity Monitor.
Mac OS X: Reading system memory usage in Activity Monitor
There you can see System Memory (Usage, Swaping, VM, etc.) plus Disk Activity and CPU Usage.
What Is Activity Monitor (or How to Take Your Mac's Pulse) - O'Reilly Media

Swaps in ST02

Hi all,
We just increased the program buffer from 850 MB to 950 MB 3 weeks back and then to 1050 MB a week back.The system looks normal for a few days and then again i can see the swpas increaing.We already have 16 GB of memory on a 64bit Win NT platform.The DB is db2 v 8.1.5......
So should i again increae it. also i read somewhere that increasing too much program buffer area willl lead to buffer fragmentation .
I am not sure . please suggest if it is ok to increase.
Also the Nametab ,Table definition, Short NTAB,Field definition, Initial records buffers are showing a lot of swaps ..
I looked at the relevant parameters:
rsdb/ntab/entrycount = 70000
rsdb/ntab/ftabsize = 62500 KB
rsdb/ntab/sntabsize = 2500 KB
rsdb/ntab/irbdsize = 30 000 KB
Which values should i change...please suggest.....

Hi Kalyan and Juan,
thanks.. for replying...
The program buffer is showing about 18000 swaps...
also the
Field definition buffer shows 151,000 buffer swaps,
Short NTAB = 19,418 buffer swaps and
initial records buffer = 54,158 buffer swaps.
We just increased the program buffer from 850 MB to 950 MB 3 weeks back and then to 1050 MB a week back.The system looks normal for a few days and then again i can see the swpas increaing.We already have 16 GB of memory on a 64bit Win NT platform.The DB is db2 v 8.1.5......
Should there be something that has to be changed in the DB2 side, or should i again increae it. also i read somewhere that increasing too much program buffer area willl lead to buffer fragmentation .
I am not sure . please suggest if and to what extent i can increase....
Also the Nametab ,Table definition, Short NTAB,Field definition, Initial records buffers are showing a lot of swaps ..
I looked at the relevant parameters:
rsdb/ntab/entrycount = 70000
rsdb/ntab/ftabsize = 62500 KB
rsdb/ntab/sntabsize = 2500 KB
rsdb/ntab/irbdsize = 30 000 KB

Lot of swaps Occuring

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