Parameters for Memory Pipes

Data transfer between ICM (Internet Communication Manager) and the SAP work processes goes via Memory Pipes (MPI). These are structures based on the shared memory.

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.

 

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

Value Range

Unit

Default value

32768-256K

Bytes

65536

mpi/total_size_MB

This parameter specifies in megabytes the total size of the shared memory area used for the MPIs.

Value Range

Unit

Default Value

5-1000

Megabytes

80

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.

Value Range

Unit

Default Value

50-20000

MPIs

4000

See also:

icm/wp_mpi_available