SUMMARY: Semaphores and Shared Memory

From: Paul Elliott (
Date: Wed Aug 02 1995 - 06:51:32 CDT

Thanks to all that replied.

Tha answer can be found in the Security, Performance and Accounting
Administration manual. More detail is available from the Answerbook.

The following can be put in the /etc/system file.

set semsys:seminfo_semmap=10
set semsys:seminfo_semmni=10
set semsys:seminfo_semmns=60
set semsys:seminfo_semmnu=30
set semsys:seminfo_semmsl=25
set semsys:seminfo_semopm=10
set semsys:seminfo_semume=10
set semsys:seminfo_semvmx=32767
set semsys:seminfo_semaem=16384

set shmsys:shminfo_shmmax=1048576
set shmsys:shminfo_shmmin=1
set shmsys:shminfo_shmmni=100
set shmsys:shminfo_shmseg=6

The above values are the default values and can be increased
according to needs.

If new values are used, you need to do a touch /reconfigure and

Paul Elliott
AI Systems Section
Telstra Research Laboratories

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