Show TOC

Parameters for Memory PipesLocate this document in the navigation structure

Use

Data is transferred between ICM (Internet Communication Manager) and the SAP work processes in AS ABAP using memory pipes (MPI). These are structures based on the shared memory. The MPI interface is also used for communication between AS Java (Java Dispatcher) and ICM, and between the Web Dispatcher and ICM.

The following parameters relating to memory pipes are provided:

mpi/buffer_size

Data transfer within memory pipes is conducted in blocks of a set length ( “MPI buffers”). Parameter mpi/buffer_size defines the size of these blocks.

Caution

Do not change the default setting of this parameter without consulting SAP first.

Domain

Unit

Default Value

32768- 256K

Bytes

65536

mpi/total_size_MB

Parameter mpi/total_size_MB specifies in megabytes the total size of the shared memory area used for the MPIs.

Domain

Unit

Default Value

5- 1000

Megabytes

80

Recommendation

On 64 bit platforms SAP recommends a value of 400.

mpi/max_pipes

The parameter specifies the maximum number of memory pipes.

Two memory pipes are required for each HTTP connection.

The default setting only has to be changed for very big systems or for the Web Dispatcher that has to keep open a lot of parallel connections.

Domain

Unit

Default Value

50- 20500

MPIs

4000