清理記憶體 ram memory
1. Sync essentials to disk first by running the following command:
# sync
2. Cleanup the RAM:
To free pagecache:
# echo 1 > /proc/sys/vm/drop_caches
To free dentries and inodes:
# echo 2 > /proc/sys/vm/drop_caches
To free pagecache, dentries and inodes:
# echo 3 > /proc/sys/vm/drop_caches
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