RSC/MP 7.3 Installation and Configuration Guide

Installing RSC/MP on UNIX Workstations
HP NonStop Remote Server Call (RSC/MP) Installation and Configuration Guide—522358-011
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System V Message Queues
System V Message Queues
RSC/MP uses message queues with messages of exactly 4 bytes in size.
•
MSGMAX (maximum size of a message) must be greater than or equal to 4.
The PIPEMAN and NIF processes use one message queue each.
•
MSGMNI (number of unique message queue identifiers) must be greater than the
total number of PIPEMAN and NIF processes that will run concurrently, plus the
requirements of all other software running on the system.
One System V message is used for every PIPEMAN or NIF message that is conveyed
through shared memory. The number of System V messages required will be
approximately equal to the number of shared memory segments which depends on
network traffic as described above in the discussion of shared memory.
•
MSGMNB (maximum number of bytes in a message queue) must be large enough
to accommodate all the messages that might be in transit to a PIPEMAN or a NIF
process at any given time, counting 4 bytes per message; or a larger value if so
dictated by requirements of other software running in the system.
•
MSGTQL (number of message headers) must be large enough to accommodate
all the messages that might be in transit to all PIPEMAN and NIF processes at any
given time, plus the requirements of all other software running in the system.
System V Semaphores
Each PIPEMAN process creates a single semaphore set containing a single
semaphore.
•
SEMMNI (maximum number of systemwide semaphore sets) and
•
SEMMNS (maximum number of semaphores in the system) must both be greater
than or equal to the number of PIPEMAN processes, plus the requirement from all
other software running in the system.