您可以指定最大垃圾收集暂停时间,吞吐量和占用空间(堆大小)。 **Maximum Garbage Collection Pause Time **:最大暂停时间目标是通过命令行选项-XX:MaxGCPauseMillis = <N>指定的。这被解释为需要<N>毫秒或更短的暂停时间的提示;默认情况下,没有最大暂停时间目标。如果指定了暂停时间目标,则会调整堆大小和与垃圾...
经典垃圾回收器发展 有了虚拟机,就一定需要收集垃圾的机制,这就是Garbage Collection, 对应的产品我们称为Garbage Collector. 1999年随JDK1.3.1一 起来的是串行方式的Serial GC,它是第一款GC。ParNew垃圾收集器是Serial收集器的多线程版本 2002年2月26日,Parallel GC和Concurrent Mark Sweep GC跟随JDK1.4.2一起发布...
而书中吞吐量的公式为:吞吐量=用户程序的运行时间/ (垃圾收集时间 + 用户程序的运行时间);和上面提到的计算公式不匹配;所以感觉这里的描述是有问题的;后来查询官方文档:The Parallel Collector,官方关于GCTimeRatio的描述如下: Throughput: The throughput goal is measured in terms of the time spent doing garbag...
The parallel collector (also referred to here as thethroughput collector) is a generational collector similar to the serial collector; the primary difference is that multiple threads are used to speed up garbage collection. The parallel collector is enabled with the command-line option-XX:+UseParalle...
Parallel Garbage Collector One of the core components of Maple's engine is the garbage collector. The garbage collector is responsible for finding and reclaiming memory that is no longer needed by the evaluation engine. In Maple 17, the garbage collector
gc roots 常说的GC(Garbage Collector) roots,特指的是垃圾收集器(Garbage Collector)的对象,GC会收集那些不是GC roots且没有被GC roots引用的对象。 1.虚拟机栈(栈帧中的本地变量表)中引用的对象; 2.方法区中的类静态属性引用的对象; 3.方法区中常量引用的对象; 4.本地方法栈中JNI(即一般说的Native方法...
The average collector speedup is 1.65 at two-core system and 2.4 at four-core system.doi:10.1007/978-3-642-14831-6_61Congpin ZhangChangmao WuLili ZhaoSpringer, Berlin, HeidelbergC. Zhang, C. Wu and L. Zhao, "Research on Algorithm of Parallel Garbage Collection Based on LISP 2 for Multi...
As you can see from the output, we lost the control of NewRatio and SurvivorRatio. The Parallel collector changes them dynamically. Table of ContentsAbout This BookHeap Memory Area and Size ControlJVM Garbage Collection LoggingIntroduction of Garbage Collectors...
This strategy the chance of the heap being depleted before background threads have finished scanning for unused objects, in which case the collector will have to stop the application which will result in a STW collection(直到堆内存被耗尽才会停止扫描未被使用的对象,开始回收,这会导致STW的后果). Th...
In this tutorial, let's run our test with plenty of Young generation memory to see how ParNew collector works. herong> java -Xms2m -Xmx64m -XX:+UseConcMarkSweepGC -Xms1200m -Xmx1200m \ -XX:NewRatio=1 -XX:SurvivorRatio=1 -Xlog:gc,gc+heap=info \ GarbageCollection > output.txt herong>...