High utilization of Linux swap partitions, refreshing the Swap partition method

Company a server to do the gateway, SSH and execute some commands are special card, looked under the system load is not high.

[Email protected] ~]# top-c

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Iowait is not high, network card traffic is also normal.

Finally look at iostat-x 2 , found that the/sda2 occupancy rate is very high, the problem should be out here.

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fdisk-l View sda2 is a swap partition

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free-m , please.

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Physical memory is almost depleted, and swap occupies more than 50%.

Search online for the following methods:

During the use of Linux VPS, swap swap partition is a very important system cache partition. He does not have enough memory to temporarily separate a portion of the space system from the hard disk as memory usage. However, if the swap occupies more than 30% of the time, the performance of the system will be affected, it is necessary to refresh the swap.

Refresh Swap

You can execute a command to refresh the swap (the data in the swap is dumped back into memory and the data in the swap is emptied)

Swapoff-a && swapon-a

Execute the above command in SSH to flush the swap partition.

Close Swap

When memory is greater than 2G, you can normally turn off

Swapoff-a

Execute the above command in SSH to close the swap partition.

Open Swap

Swapon-a

Execute the above command in SSH to open the swap partition.

High utilization of Linux swap partitions, refreshing the Swap partition method