Become superuser.
Edit the /etc/system file and add the following variables to increase shared memory segments.
set shmsys:shminfo_shmmax=value set shmsys:shminfo_shmmin=value set shmsys:shminfo_shmmni=value set shmsys:shminfo_shmseg=value set semsys:seminfo_semmap=value set semsys:seminfo_semmni=value set semsys:seminfo_semmns=value set semsys:seminfo_semmsl=value set semsys:seminfo_semmnu=value set semsys:seminfo_semume=value |
shmsys:shminfo_shmmax |
Maximum shared memory segment size |
shmsys:shminfo_shmmin |
Minimum shared memory segment size |
shmsys:shminfo_shmmni |
Number of shared memory identifiers |
shmsys:shminfo_shmseg |
Number of segments, per process |
semsys:seminfo_semmap |
Number of entries in the semaphore map |
semsys:seminfo_semmni |
Number of semaphore identifiers |
semsys:seminfo_semmns |
Number of semaphores in the system |
semsys:seminfo_semmsl |
Maximum number of semaphores, per ID |
semsys:seminfo_semmnu |
Number of processes using the undo facility |
semsys:seminfo_semume |
Maximum number of undo structures per process |
Verify the shared memory value changes.
# grep shmsys /etc/system |
# init 6 |
The following shared memory values accommodate a system with a large amount of memory (for example, 128 MBytes) that is running a large database application.
set shmsys:shminfo_shmmax=268435456 set shmsys:shminfo_shmmin=200 set shmsys:shminfo_shmmni=200 set shmsys:shminfo_shmseg=200 set semsys:seminfo_semmap=250 set semsys:seminfo_semmni=500 set semsys:seminfo_semmns=500 set semsys:seminfo_semmsl=500 set semsys:seminfo_semmnu=500 set semsys:seminfo_semume=100 |