Example tutorial on optimizing SSD hard disk in Linux system

Noop ; /sys/block/sdb/queue/scheduler

3, echo 4096 > read_ahead_kb

Indicates the number of Kb of pre-read data, the default is 128

4, echo 4096 > nr_requests

The default queue length is 128

5. Check the IO scheduling algorithm supported by the current system

demesg | grep -i scheduler

6. Check the I/O scheduling algorithm of the current system

　cat /sys/block/sdb/queue/scheduler

7. Clear the cache

a), release the linux cache

Echo 3 > /proc/sys/vm/drop_caches Default is 0

mem used = free + buffers + cached

b), release page cache

　 Echo 1 > /proc/sys/vm/drop_caches

c), release dentries and inodes cache

echo 2 > /proc/sys/vm/drop_caches

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