Description of the Linux kernel parameter sem

SEM: is an abbreviation for semaphores, which represents the semaphore set. It consists of four values: SEMMSL, Semmns, SEMOPM, Semmni.

General Settings Kernel.sem = 250 32000 100 128

Semmns: The maximum number of semaphores associated with Oracle's process count. SEMMSL * Semmni

SEMOPM: Maximum number of semaphores allowed for system calls. At least 100; or equal to SEMMSL.

Semmni: The maximum number of system semaphore set. Minimum 128

SEMMSL: The maximum number of semaphores in each semaphore set. Minimum 250, the system recommended for processes parameter setting is set to processes+10.

The file where the kernel parameter resides is/etc/sysctl.conf

When installing the Oracle database, you need to add the kernel parameters according to the actual situation, the general kernel parameters are added as follows

Kernel.shmall = 4294967296

KERNEL.SEM=250 32000 100 128

Fs.file-max = 6815744

FS.AIO-MAX-NR = 1048576

Net.ipv4.ip_local_port_range = 9000 65500

Net.core.rmem_default = 262144

Net.core.rmem_max = 4194304

Net.core.wmem_default = 262144

Net.core.wmem_max = 1048576

After Setup is complete, you can use Sysctl-p to make the kernel parameter settings take effect immediately.

This article is from the "Drunken Cold wind" blog, please be sure to keep this source http://zydw415.blog.51cto.com/10608909/1761488

Description of the Linux kernel parameter sem