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Free Up RAM in Redhat & CentOS Linux

Memory normally is occupied by 3 main objects, caches debtries and inodes. However you can free memory at times with the following commands.

1. Sync essentials to disk first by running the following command:

Code:
sync  
2. Cleanup the RAM:

Writing to this will cause the kernel to drop clean caches, dentries and
inodes from memory, causing that memory to become free.

To free pagecache:
Code:
echo 1 > /proc/sys/vm/drop_caches
To free dentries and inodes:
Code:
echo 2 > /proc/sys/vm/drop_caches
To free pagecache, dentries and inodes:
Code:
echo 3 > /proc/sys/vm/drop_caches
As this is a non-destructive operation and dirty objects are not freeable, the user should run `sync' first.

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