Tuesday, January 1, 2013

16 Configure Kernel Parameter and number of open file descriptor

maximum number of open file descriptors: nofiles

Global setting can be found via /proc/sys/fs/file-max

Change it can be done via /etc/security/limits.conf


# soft limit
ulimit -Sn
# Hard Limit
ulimit -Hn


Maximum number of processes available to a single user: nproc

ulimit -Su
ulimit -Hu



Kernel Parameter

Check current value:

sysctl -a


Below is the Oracle recommendation kernel parameters.

semmsl semmns semopm semmni 250 32000 100 128 /proc/sys/kernel/sem
shmmni 4096 /proc/sys/kernel/shmmni
shmmax Recommended: More than half the physical memory /proc/sys/kernel/shmmax
file-max 6815744 /proc/sys/fs/file-max

Minimum: 9000

Maximum: 65500

rmem_default 262144 /proc/sys/net/core/rmem_default
rmem_max 4194304 /proc/sys/net/core/rmem_max
wmem_default 262144 /proc/sys/net/core/wmem_default
wmem_max 1048576 /proc/sys/net/core/wmem_max
aio-max-nr 1048576 /proc/sys/fs/aio-max-nr


To make the changes, we can update /etc/sysctl.conf

Once the file is being update, we can run below command to make it effective,

/sbin/sysctl -p


We  can use ipcs –lm to check the







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