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Allocation Failure Logs Therefore Allocation failure log is simply a Java logging indicating that it ran out of heap space and it triggered a garbage collection. A minor GC will further move long-surviving objects to old generation during the process to free up the required memory.
PSYoungGen refers to the garbage collector in use for the minor collection. PS stands for Parallel Scavenge. The first set of numbers are the before/after sizes of the young generation and the second set are for the entire heap. ( Diagnosing a Garbage Collection problem details the format)
If your application's object creation rate is very high, then to keep up with it, the garbage collection rate will also be very high. A high garbage collection rate will increase the GC pause time as well. Thus, optimizing the application to create fewer objects is THE EFFECTIVE strategy to reduce long GC pauses.
The G1 GC is a regionalized and generational garbage collector, which means that the Java object heap (heap) is divided into a number of equally sized regions. Upon startup, the Java Virtual Machine (JVM) sets the region size. The region sizes can vary from 1 MB to 32 MB depending on the heap size.
I have a method which hits DB and fetches lot of records into memory for processing. After I fetch the records and before I start processing, I get the following log message. What does it mean ?
164575.034: [GC (Allocation Failure) 4937664K->3619624K(5602816K), 0.0338580 secs]
Options:
java.opts=-d64 -Xmx8g -XX:+PrintGCTimeStamps -verbose:gc -XX:MaxPermSize=512m -XX:+UseParallelGC -XX:+UseParallelOldGC
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