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Modifying Cache Parameters

Purpose

Modify some cache parameter settings at the operating system layer to improve server performance.

Procedure

Modify the parameters based on the following table.

Table 1 Cache parameters

Linux Parameter

Description

Operation

swappiness

Policy of using the swap partition and memory. A larger value indicates more active use of the swap partition, and a smaller value indicates more active use of the memory.

Set vm.swappiness to a small value 1 to reduce the swap partition usage.

  1. Open the file.
    1
    vim /etc/sysctl.conf
  2. Press i to enter the insert mode and add the following information to the end of the file:
    1
    vm.swappiness = 1
  3. Press Esc, type :wq!, and press Enter to save the file and exit.
  4. Make the modification take effect.
    1
    sysctl -p

dirty_ratio

Percentage of dirty data allowed in the memory

Set dirty_ratio to 5.

1
echo 5 > /proc/sys/vm/dirty_ratio
Parent topic: OS Tuning