performance - GC in Java 8 get obviously slower compare to Java 7 -

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i have server 72 gb memory running, use java 7 parallel gc , heap size in 25g. after switch java 8, particular task slower. task read file around 15gb in memory, , update relevant data in db. takes around 1 hour finished job, after java 8, becomes 1.5 hours.

i tried:

  1. increase heap size 50gb => not help
  2. change gc algorithm parallel cms, becomes slower (1.8 hour)

so not sure can start have look, java library run task still compiled in java 7 not sure if relevant? after switch java 7, performance came back.

to compare/find gc issue, it's better enable gc logging:

  • -xx:+printgcdetails -xx:+printgctimestamps -xloggc:logs/gc.log

and use gcviewer parse/visualize gc log files. useful if gather gc log , attach question.

in theory (and practice), java 8 faster java 7. mentioned java writes data db. may worth analyze resource consumption of both, may db root cause.


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