The relationship between Linux memory usage and swap __linux

Memory and Swap Graphics

According to the picture collation trend contrast

number	Mem Change Trends	change trend of swap
1	Flat	Rise
2	Rise	Drop
3	Rise	Flat
4	Flat	Rise
5	Drop	Drop
6	Flat	Drop
7	Rise	Drop
8	Flat	Rise

* Trend contrast arrangement

number	Mem Change Trends	change trend of swap
1	Flat	Rise
4	Flat	Rise
6	Flat	Drop
8	Flat	Rise
2	Rise	Drop
7	Rise	Drop
3	Rise	Flat
5	Drop	Drop

Conclusion
1. No change in memory use, swap may rise may also drop
2. When memory usage goes up, swap may not change or it may rise
3. When memory usage drops, swap also drops.

Note: Current memory configuration and usage

The current swapniess is 60, is not said that when the memory used 60%, that is 38GB, start using swap buffer and cache use is really not high, memory is very tight memory 60% is 38GB.