syslog collector

It's been 2014 years now, but for most developers there are two things that are still a mystery--java garbage collection and the opposite sex (the yards were laughed at again). Since I don't know much about the latter, I think I'll try to talk about the former, especially with the advent of Java8, where there have been significant changes and improvements, the most important of which is the removal of persistent generations (PermGen) and some exciting new optimizations (which are mentioned later

History of the Java garbage collectorFirst stage, Serial (serial) collectorBefore jdk1.3.1, the Java virtual machine could only use the serial collector. The serial collector is a single-threaded collector, but its "single-threaded" meaning does not merely mean that it uses only one CPU or one collection thread to complete garbage collection, and more importantly

There are three garbage collection algorithms for the JVM: 1. Mark-Clear (Mark-sweep): Nothing to say, direct 2. Mark-Organize (mark-compact) 3. CopyGenerational Collection AlgorithmsThe current garbage collection isusing generational collection algorithmsIt also derived a lot of garbage collector "generational collection" (generational Collection) algorithm, the Java heap is divided into the new generation and the old age, so that according to the ch

Overview One of the most criticized C + + is that there is not a single memory garbage collector (exactly, no standard garbage collector). The main point of this article is to implement one of the most compact, feature-constrained garbage collector in C/s + +. The main characteristics that this garbage collector disti

objects died, only a small number of survival, then choose the replication algorithm, only need to pay a small number of surviving objects of the replication cost can be completed collection. In the old age, because of the high survival rate of the object and the lack of additional space to guarantee it, it must be recycled using the "mark-clean" or "mark-sweep" algorithm.garbage collectorIf the collection algorithm is the method of memory recycling, the garbage

1.Serial CollectorThe advantage is simple and efficient, single threaded to avoid the overhead of thread interaction.Disadvantage, stop the world is required for garbage collection (all user threads are paused).2.ParNew CollectorIt is a multi-threaded version of the serial collector and is a multi-threaded parallel collection of the new generation. Is the default Cenozoic collector for the CMS

Memory Management in the Java hotspot™virtual machineConcurrent mark-sweep (CMS) CollectorFor many applications, end-to-end throughput are not as important as fast response time. Young generationCollections does not typically cause long pauses. However, old generation collections, though infrequent, canImpose long pauses, especially when large heaps is involved. To address this issue, the HotSpot JVM includes aCollector called the Concurrent Mark-sweep (CMS)

This article mainly introduces several garbage collectors of the JVM. As shown below, the above three are the new generation of collectors, the following three are the old collectors, wherein the G1 collector can be used for the new generation and the old age collection work.JVM garbage collector1,Serial (serial collector): For the generation of GC, replication algorithm, the default is client mode at start

Serial collector: Single thread, "Stop the World", must stop all worker threads when doing garbage collection threads; Parnew collector (Parallel parallel): Multi-threaded, garbage collection will also stop the worker thread; Both can be used in conjunction with the CMS (concurrent Mark Sweep) collector, and all three are concerned with minimizing the downtime

This is the last GC-related article, the LZ is just a list of key parameters related to the garbage collector in the Hotspot JVM, as well as explanations of each parameter. Don't say much nonsense, this begins. Garbage collector selection Parameters USESERIALGC: Open this parameter using the serial serial old collector (client mode defaults). USEPARNEWGC: Ope

cross-library operations and customize the data source for the report. The advantage of this approach is that it is flexible, theoretically any operation can be done through the program, and the disadvantage is that it is too difficult to write. Many high- level languages such as Java lack effective support for set operations, there is no corresponding class library, resulting in a simple group to write a lot of (loop) code, not to mention that the association will be after the group summary an