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Overflow of dispatcher request queue
Tip-No.: 1167 ( INFO1167 )

Short text

Overflow of dispatcher request queue
Tip-No.: 1167

Symptom

An application server crashes. The error log contains messages such as:
DpRqPutIntoQ: msgsnd (11: no more processes) (dpuxtool 0737)

Cause

The dispatcher queue (component of the applciation server) is created
via the UNIX-Message-Queue mechanism. The total number of bytes in this
queue is limited and can only be changed via a UNIX kernel parameter
(i.e. via re-binding of the UNIX kernel and booting).
The manufacturer's default for this parameter is too low, given that
our application server not only offers dialog services but also
update, enqueue and batch services.

Solution

For 1.1:
- the above named UNIX-Kernel-Parameter is included in the list of
those that must be specially configured on every SAP R/3 machine.
- the reaction of the queue overflow is being improved.
For 2.0:
- Iin future, will not be based on UNIX-Message-Queue mechanism
rather directly on Shared Memory and semaphores (for portability
reasons too).