A.4.2 Tuning Work Procedures

Use the following command to check the values set for the relevant parameters in the current system:

/sbin/sysctl -a

Example

# /sbin/sysctl -a
...
(snip)
...
kernel.sem = 250        32000   32      128
kernel.msgmnb = 4194304
kernel.msgmni = 8192
kernel.msgmax = 65536
kernel.shmmni = 4096
kernel.shmall = 4294967296
kernel.shmmax = 68719476736
...
(snip)
...

Refer to "A.4.1 System Parameter Tuning Values" and compare with the current values that are set. Calculate the appropriate value to set for each parameter, taking into account the type (maximum or additional).

Edit "/etc/sysctl.conf" as shown in the example below.

Example

kernel.sem = 250 32002 32 130
kernel.shmmni = 4096
kernel.msgmnb = 4194304
kernel.msgmni = 8192

Use the following command to check that the edited content is reflected in "/etc/sysctl/conf":
```
# /bin/cat /etc/sysctl.conf
```
Use one of the following methods to enable the settings set in Step 3:
- Rebooting the system to reflect the settings
```
# /sbin/shutdown -r now
```
- Using /sbin/sysctl -p to reflect the settings
```
# /sbin/sysctl -p /etc/sysctl.conf (*1)
```
  *1: Reboot is not required if this command is used.

Check the output of the following command to check that the set system parameters are reflected:

# /sbin/sysctl -a

Example

# /sbin/sysctl -a
...
(snip)
...
kernel.sem = 250        32002   32      130
kernel.msgmnb = 4194304
kernel.msgmni = 8192
kernel.msgmax = 65536
kernel.shmmni = 4096
kernel.shmall = 4294967296
kernel.shmmax = 68719476736
...
(snip)
...