SAP TABLES

em/initial_size_MB SAP Parameter attribute - Initial size of extended memory pool








em/initial_size_MB is a SAP Parameter attribute which is used to control Initial size of extended memory pool information. This is available within R/3 SAP systems depending on the version and release level.

Below is the standard documentation available and a few details of the attributes values .

em/initial_size_MB profile paramerter attributes


Parameter Name: em/initial_size_MB
Description: Initial size of extended memory pool
Default Value: (min(512000, $(PHYS_MEMSIZE) * 0.7))
Parameter Type ( See IF_PARAMETER_TYPES): Integer range(INT_RANGE)
Restriction Values: 128 512000
Parameter Unit: MB
Parameter Group: ExtMemory
CSN Component: BC-CST-MM
System-Wide parameter: No
Dynamic Parameter: No
Vector Parameter: No
Has Sub-Parameters: No
Check Function Exists: No

Parameter documentation

Note the operating system dependency for Microsoft Windows. The value specifies the initial size of the memory area that SAP Memory Management manages as extended memory. The memory requirements for interactive users' programs are met from this area. This memory type can be assigned very quickly to changing work processes by mapping and therefore allows very fast context switches. Aim Ideally, this pool should be large enough to contain the total of all user contexts, so that context switching for all users could be performed at optimal speed. You can restrict the maximum usage of an individual user with the parameter ztta/roll_extension. This prevents one user or a small number of users using all of the extended memory. If the extended memory is exhausted, additional memory requests are satisfied from the roll area and then from from the local address area of a work process (heap, malloc). The data in the roll area must be copied during the context switch, while the data in the local process area leads to exclusive reservation of the entire work process (PRIV mode).

See SAP Parameter Documentation for full SAP documentation for this profile parameter.