em/initial_size_MB: Extended Memory Pool Size

Use

This value specifies the extended memory pool size that the SAP system manages for the SAP Extended Memory.

The value is stated in megabytes.

Integration

Ideally, this pool is large enough to contain the sum of all the user contexts. The pool must always be larger than the size of the parameter ztta/roll_extension. This parameter specifies how much extended memory can be allocated from the pool to one user context.

If the pool is used up, heap memory is allocated (see Private Memory and Allocating Memory for User Contexts). The work process switches to the PRIV mode and is reserved exclusively for the current user context. After processing the user context, the work process might restart automatically if the process size specified in abap/heaplimit is exceeded.

Activities

The kernel default is calculated using the following formula: (min(512000, $(PHYS_MEMSIZE) * 0.7)). This value should not normally be changed.

Keep in mind the following notes about the pool size: