减少垃圾收集的暂停

Question

I think I've got a problem with the configuration of the garbage collection. The Server use a jetty with structr (neo4j) and after a few requests the server stands still because of the garbage collection.

My server has 8 cores and 48gb ram

I start the application with this parameters

"-server -d64 -Xms20g -Xmx20g -XX:MaxPermSize=512m -XX:+UseNUMA -XX:+UseConcMarkSweepGC -XX:+DisableExplicitGC -XX:MaxNewSize=8g"

Could you help me to find the right configuration for the gc? Do you need more informations?

This shows the work of the gc and the heap of my application. (gcviewer)

• yellow - shows the young generation
• red - shows the heap size
• green - shows the gc time
• grey - shows the reserved young generation space
• purple - shows the reserved heap

Answer 1

and after a few requests the server stands still because of the garbage collection.

green - shows the gc time

Your image suggests otherwise, the green line shows sub-second pauses a few minutes after startup.

Either the perceived hangs are caused by something else or you should provide the whole GC log and indicate which particular GC occurrence you consider problematic.