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Memory Allocation

Work process memory allocation strategy can be different according to different release and platform.

In general, we know the allocation of Dialog and Non-Dialog work process are different.
Dialog -> Roll First -> EM -> Roll Area  -> Heap
Non-Dialog -> Roll Area -> Heap -> EM

AIX - With configuration of  ES/TABLES = SHM_SEGS, the nonDIA allocation strategy is same as DIA.
Windows  and Pase400 -  the allocation order is changed in general
Linux - the order is changed when em/implementation is set to map

Please also refer to note 177226 on report RSMEMORY

Below SAP Help links are useful

( Please note that Memory management issue under Windows platform is typically handled under BC-OP-NT component. )

Resource and Quota are two important terms that we need to understand. Quota limits the usage, which is important to prevent further consumption of resources. Resources can be come from R/3 itself or systems.

Example of Resource:
em/initial_size_MB
abap/heap_area_total
swap space

Example of Quotas:
ztta/roll_first, ztta/roll_area
ztta/roll_extension
abap/heap_area_(non)dia

Memory Analysis 
There are many common memory dumps, that we can provide standard guidelines in resolving them.
TSV_TNEW_PAGE_ALLOC_FAILED
STORAGE_PARAMETERS_WRONG_SET

We will talk about more on memory analysis here on next update. 


 

SAP Important Memory Notes:

General: 

  • #146289 :  Parameter Recommendations for 64-Bit SAP Kernel
  • #425207 : SAP memory management, current parameter ranges
  • #153641 : Swap space requirement for R/3 64-bit kernel
  • #548845 : Internal modes uses more than 2 GB
  • #835474 : More than 32 GB extended memory
  • #1147109 : Heap memory shortage

Operating System Specific:

AIX

  • #445533 : Lots of extended memory on AIX (64 bit)
  • #789477 : Large extended memory on AIX (64-bit) as of Kernel 6.20
  • #323816 : User limits on AIX
  • #191801 : AIX 64-bit with very large amount of Extended Memory

HPUX

  • #1112627 :  SAP on HP-UX: Recommendations for swap and pseudo swap
  • #172747   :  HP-UX Operating System kernel parameter recommendations

Linux

  • #941735 :  SAP memory management for 64-bit Linux systems
  • #386605 :  SAP Memory Management for Linux (32-bits)
  • #171356 :  SAP software on Linux: Essential information

Sun Solaris

  • #570375 :  SAP on Sun Solaris: Swap Space and Paging

Windows

  • #931024 :  FAQ: 64-bit platforms for Windows
  • #88416   :  Zero administration memory management as of 4.0A/ Windows
  • #13347   :  Windows editions and memory support
  • #110172 :  Windows: Transactions with large memory requirements
  • #129813 :  Windows: Problems due to address space fragmentation
  • #546361 :  FAQ: Storage problems on NT/Windows 2000
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1 Comment

  1. Unknown User (qv3vh3r)

    Hi

     Is this blog discontinued ?