garbage collection analysis

, School of software and microelectronics, Peking University [3pcdLike most software development technologies, statistical principles can always play a powerful catalyst in technological development. Before and after 1980, technical staff who are good at using statistical analysis knowledge in the study found that the survival cycle of most memory blocks is relatively short, the garbage collector should foc

Previously did not write the habit of blogging, learned things can not always remember, so used to "square now check", every time to see a lot of things, in order to take a certain aspect of things to see the whole.For Java garbage collection mechanism, this long ago learned, and understand, for a long time not to be thrown back to the island of the claw, here or down, convenient to check again later, do no

Serial collector for JAVA Garbage Collector and serial for garbage collection 1. Features The Serial collector is the most basic and oldest collector in the Java Virtual Machine. It was the only choice for collecting new generations of Java virtual machines before JDK 1.3.1. The Serial collector is a single-threaded collector, but its "Single-threaded" doesn't ju

For Java garbage collection mechanism, this long ago learned, and understand, for a long time not to be thrown back to the island of the claw, here or down, convenient to check again later, do not waste too much time.To understand the Java garbage collection mechanism, you need to know the differences between versions

Java Garbage Collector algorithm and java garbage collection AlgorithmReference Counting Algorithm:PythonAdd a reference counter to the object. Every time a counter is referenced, the counter value is added with 1. When the reference fails, the counter value is reduced by 1; objects whose counter is 0 at any time cannot be used again.Disadvantage: It is difficult

obscure storage problem. When programming in Java, the garbage collection mechanism can greatly shorten the time. Second, it protects program integrity. Garbage collection is an important part of Java's security policy. One potential drawback of garbage

The previous article introduced. the basic principles of net garbage collection and the internal mechanism of implementing the Finalize method for garbage collection; this article describes weak reference objects, generation, and multi-thread garbage

delete the data through code, but if the user switches to the function that requires the data, you must re-build the data from the user's disk. Weak references provide a simple and effective solution for this scenario. When you switch to other functions, you can create a weak reference object for the data and remove the strong reference to the data. In this way, if the memory occupied by the program is very low, the garbage

, which marks the object that the gcroots can directly relate to, has a short time.(2). Concurrent tagging for gcroots tracing (accessibility analysis) process for a long time.(3). Re-mark, fix the tag record of the part of the object that caused the mark to change during the concurrent tag, and the time is longer.(4). Concurrent cleanup, reclaim memory space for a long time.The two phases of concurrent tagging and concurrent cleanup take the longest,

burden of programming. First, it can make programming more efficient. In the absence of a garbage collection mechanism, it may take a lot of time to solve a difficult memory problem. When programming in the Java language, the garbage collection mechanism can greatly shorten the time. Second, it protects the integrity

Introduction: GC is the most modern language built-in features, the author of the Go language claims that the GC pauses below 10ms in-depth analysis, but also with the Java garbage collector contrast. If the Go GC is mature enough, see the highly available architecture of volunteer translators. I've seen a bunch of recent articles about the latest garbage collec

additional space was allocated to guarantee it, it had to be recycled using the tag-clear or mark-and-sweep algorithm.6, the algorithm implementation of the hotspotThe object survival judgment and garbage collection algorithm are introduced from the theory point of view, then the implementation of the Hotspot virtual machine is introduced.(1) Enumerating the root nodesThe GC Roots Accessibility

purged and lead to a memory leak. Even if the garbage collection mechanism is not available, it is possible that the root is logged because the record may be faster than the root if the garbage collection mechanism is checked after each possible root is found. But the garbage