SWAP partition in Linux, similar with virtual memory in Windows.
When the memory got out of range, the program will be located in swap partition.
But the speed is slower than the RAM because swap partition is on the disk.
Goods
-Give more memory spaces to insufficient RAM
-Allocate the program that is need fast memory
Bads
-Can not control the portion of swap dynamically
-Increase disk usage
-Does not always lead performance enhancement
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