CODEWITHSUNDEEP
javagarbage-collectionverbosegc
dmc
dmc

Reputation: 411

java is PSYoungGen a stop the world event

are these stop the world events, for my a java application / jvm and if so which one. user sys real,

[PSYoungGen: 347808K->672K(348160K)] 415832K->68744K(1047552K), 0.0019772 secs] [Times: user=0.03 sys=0.00, real=0.00 secs]

[PSYoungGen: 347808K->640K(348160K)] 415880K->68792K(1 047552K), 0.0018775 secs] [Times: user=0.01 sys=0.01, real=0.00 secs]

[PSYoungGen: 347776K->704K(348160K)] 415928K->68912K(1047552K), 0.0020238 secs] [Times: user=0.02 sys=0.00, real=0.00 secs]

Thanks

Upvotes: 1

Views: 882

Answers (1)

davidxxx
davidxxx

Reputation: 131436

Collections of most of Garbage Collector implementations do "stop the world" events.

For example, the default Garbage Collector implementation used on a JVM 1.7 is G1 and you can read in the Oracle documentation that it does "stop the world" pauses for young generation collection :

The G1 GC has a pause time-target that it tries to meet (soft real time). During young collections, the G1 GC adjusts its young generation (eden and survivor sizes) to meet the soft real-time target.

The real difference is how long the stop has elapsed. You have the other responses here : How to read a verbose:GC output?


 Edit : I precised the "most of" GC implementations (not all) and illustrated with the G1 example.

Upvotes: 1

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