24
Jun 09
Java: GC Options
Verbose GC options
| Option | Default value | Max Value | Description |
-XX:+PrintGCDetails |
false | PrintGC details | |
-XX:+PrintGCTimeStamps |
false | Adds timestamp info to GC details | |
-XX:+PrintHeapAtGC |
false | Prints detailed GC info including heap occupancy before and after GC | |
-XX:+PrintTenuringDistribution |
false | Prints object aging or tenuring information | |
-XX:+PrintHeapUsageOverTime |
false | Print heap usage and capacity with timestamps | |
-Xloggc:filename |
false | Prints GC info to a log file | |
-verbose:gc |
false | Prints some GC info | |
-XX:+PrintTLAB |
false | Print TLAB information |
Parallel Scavenge Collector
| Option | Default value | Max Value | Description |
-XX:UseParallelGC |
Enables young generation parallel scavenge collector. Works only with the default mark-sweep-compact collector. Do not use with the concurrent collector. | ||
-XX:+UseAdaptiveSizePolicy |
false | Automatically sizes the young generation and chooses an optimum survivor ratio to maximize performance. | |
-XX:+PrintAdaptiveSizePolicy |
false | Prints information about adaptive size policy | |
-XX:ParallelGCThreads |
As many threads as CPUs | Controls the number of threads used for copying collection |
Parallel Copying Collector
| Option | Default value | Max Value | Description |
-XX:+UseParNewGC |
Enables young generation parallel copying collector. Use with concurrent collector or default mark-sweep-compact collector | ||
-XX:ParallelGCThreads |
As many threads as CPUs | Controls the number of threads used for copying collection |
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