2. DATA STRUCTURES/MECHANISMS In this section, we describe the data structures and mech- anisms used by the Garbage-First collector. 2.1 Heap Layout/Heap Regions/Allocation The Garbage-First heap is divided into
1278K:表示整个堆内存(年轻代+老年代)的在垃圾收集之后的使用空间 Heap//年轻代总空间 1571328K ,使用空间837686KPSYoungGen total 1571328K, used 837686K [0x0000000760000000,0x00000007c0000000,0x00000007c0000000)//表示 eden space年轻代的伊甸区使用空间 1569792K ,使用率837686/15697...
Java is not only used to run our thousands of deployables, but also our queues (Kafka) and Big Data solution (HBase). Keeping all these JVMs performant while providing a good user experience has forced us to dig deep into Garbage Collection (GC), particularly the Garbage First Garbage ...
Garbage-First Internals This section describes some important details of the Garbage-First (G1) garbage collector. Java Heap Sizing G1 respects standard rules when resizing the Java heap, using-XX:InitialHeapSizeas the minimum Java heap size,-XX:MaxHeapSizeas the maximum Java heap size,-XX:Mi...
options: Lower the target occupancy for when to start Space-Reclamation by increasing the buffer used in an adaptive IHOP calculation by modifying-XX:G1ReservePercent; or, disable the adaptive calculation of the IHOP by setting it manually using-XX:-G1UseAdaptiveIHOPand-XX:InitiatingHeapOccupancy...
first garbage collection, it’s moved to the survivor space. When an object survives multiple collection cycles, it’s eventually moved to the older generation. This is done so that a run-time efficient algorithm can be used on new objects (this algorithm’s run-time depends only on the ...
(776768K)( in the first line) is the total available space, not counting the space in thepermanentgeneration, which is the total heap minus one of the survivor spaces. The minor collection took about a quarter of a second. 0.2300771 secs (in the first line) ...
Heap defnewgeneration total 4928K, used 142K [0x00000000ff000000,0x00000000ff550000,0x00000000ff550000) eden space 4416K,3% used [0x00000000ff000000,0x00000000ff023bd8,0x00000000ff450000)fromspace 512K,0% used [0x00000000ff450000,0x00000000ff450000,0x00000000ff4d0000) ...
[0.052s][debug][gc,refine ] Stopping 0 [0.052s][info ][gc,heap,exit ] Heap [0.052s][info ][gc,heap,exit ] garbage-first heap total 129024K, used 1024K [... [gc,heap,exit ] region size 1024K, 2 young (2048K), 0 survivors [0.052s][info ][gc,heap,exit ] Metaspace used ...
A garbage collector treats a garbage-collected heap as divided into heap regions, for each of which it maintains a respective remembered set, whose entries list the locations where