$ memory_pressure
The system has 8589934592 (524288 pages with a page size of 16384).

Stats: 
Pages free: 3626 
Pages purgeable: 75 
Pages purged: 222237728 

Swap I/O:
Swapins: 46541476 
Swapouts: 56191346 

Page Q counts:
Pages active: 94318 
Pages inactive: 92446 
Pages speculative: 1184 
Pages throttled: 0 
Pages wired down: 128755 

Compressor Stats:
Pages used by compressor: 165233 
Pages decompressed: 1532221256 
Pages compressed: 1732669331 

File I/O:
Pageins: 166378472 
Pageouts: 2822130 

System-wide memory free percentage: 39%

Exit code: 0