jstat ref

参考：https://docs.oracle.com/javase/8/docs/technotes/tools/unix/jstat.html

常用命令

jstat -gcutil $(pgrep java) 3000 10

-gcutil option
Summary of garbage collection statistics.

• S0: Survivor space 0 utilization as a percentage of the space's current capacity.
• S1: Survivor space 1 utilization as a percentage of the space's current capacity.
• E: Eden space utilization as a percentage of the space's current capacity.
• O: Old space utilization as a percentage of the space's current capacity.
• M: Metaspace utilization as a percentage of the space's current capacity.
• CCS: Compressed class space utilization as a percentage.
• YGC: Number of young generation GC events.
• YGCT: Young generation garbage collection time.
• FGC: Number of full GC events.
• FGCT: Full garbage collection time.
• GCT: Total garbage collection time.