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An Example of Semaphore Settings

As shown at Section 8.3, “The SEMMNS Parameter” the maximum number of semaphores that can be

allocated on a Linux system will be the lesser of: SEMMNS or (SEMMSL * SEMMNI). Since SEMMNI

can stay at 128, we need to increase SEMMNS to 641280 (5010*128).

As shown at Section 8.4, “The SEMOPM Parameter” a semaphore set can have the maximum

number of SEMMSL semaphores per semaphore set and it is recommended to set SEMOPM equal to

SEMMSL. Since SEMMSL is set to 5010 the SEMOPM parameter should be set to 5010 as well.

Hence, if the ora.init parameter PROCESSES is set to 5000, then the semaphore settings should be

as follows:

sysctl -w kernel.sem="5010 641280 5010 128"

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Red Hat ENTERPRISE LINUX AS 2.1 - Guide d'installation Page 27