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executes class bytecode. After the thread is created, the program counter (PC) and stack (stack) are generated, and the program counter holds the offset of the next instruction to be executed in the method, and the stack frames are stored in each stack frame, and each stack frame corresponds to each call of each method, and the stack frame is made up of the local variable area and the operand stack. Local variables are used to store local variables and parameters in the method, which are used t
EU OC OU MC MU CCSC CCSU YGC YGCT FGC FGCT GCT20480.0 20480.0 0.0 13115.3 163840.0 113334.2 614400.0 436045.7 63872.0 61266.5 0.0 0.0 149 3.440 8 0.295 3.735 1 2 3 S0C: The size of the first surviving area S1C: The size of the second surviving area S0U: The use size of the first surviving area S1U: The use size of the second surviving area EC: Size of the Eden D
StatisticsC:\Users\Administrator>jstat -gc 2060 S0C S1C S0U S1U EC EU OC OU MC MU CCSC CCSU YGC YGCT FGC FGCT GCT20480.0 20480.0 0.0 13115.3 163840.0 113334.2 614400.0 436045.7 63872.0 61266.5 0.0 0.0 149 3.440 8 0.295 3.735 1 2 3 1 2 3 S0C: The size of the first surviving area S1C: The size of the second surviving area S0U: The use
, for the long life cycle of the object, this traversal is not effective, because it may have been traversed many times , but they still exist. Therefore, the generational garbage collection uses the idea of divide and conquer, divides the generations, puts the objects of different life cycles on different generations, and uses the garbage collection method which is most suitable for it in different generat
, there will always be an empty survivor area for a period of time. After several GC cycles, the surviving objects are transferred to the old generation memory space. This is usually done by setting an age threshold before the younger generation is eligible to ascend to the old age. Old GenerationOlder generations of memory contain long-lived objects and objects that survived multiple Minor GC . Garbage collection is usually done in the old y
Sun's jvmgenerationalcollecting (garbage collection) principle is that it divides objects into younger generations (young), older generations (tenured), and persistent generations (Perm), using different algorithms for objects of different lifecycles. (Based on the object life cycle analysis)1.Young (Young Generation)The young generation is divided into three dis
the offset of the next instruction to be executed in the method, and the stack frames are stored in each stack frame, and each stack frame corresponds to each call of each method, and the stack frame is made up of the local variable area and the operand stack. Local variables are used to store local variables and parameters in the method, which are used to store the intermediate results produced during the execution of the method.Memory Management and garbage collectionJVM Memory Composition St
thread is still running. Mechanisms for recycling According to statistical analysis, Java (including some other high-level languages) in most of the object lifecycle is short-lived, so the Java memory Generation management. The purpose of generational is simply to use different management strategies (algorithms) for different generations of memory blocks to maximize performance. Compared with the old generation, usually younger generation is much s
the resolution of the device's screen. The pixel ratio of some mobile phones is greater than or equal to 1.5. If you want to implement the layout on a high-resolution device, you can use the following media query: @ Media only screen and (-webkit-min-device-pixel-ratio: 1.5 ), Only screen and (-o-min-device-pixel-ratio: 3/2 ), Only screen and (min-device-pixel-ratio: 1.5 ){ . Imagebox {background :( url: "images/high/demo.jpg ");} } Note: If the above method is used, it will be loaded even if t
Use the following code to learn how to set the basic attributes of coretext and learn more about the basic attributes used by coretext to set its own styles. First, inherit UIView and reload its drawrect function: [cpp]-(void) drawRect :( CGRect) rect {// Drawing code. // create the NSString * longText = @ "Yuan weilai Lorem ipsum dolor sit amet, Before the iPad was released you had basically two ways how to get text on screen. either you wowould stick with UILabel or UITextView provided by UIKi
:msn Settings) Step two: Turn on the "Back up my msnl chat record" feature of Jinshan fast disk First of all, please download the official website of Jinshan Fast to install the latest version of Jinshan fast disk in the new fast disk, the user login, click on the right side of the Third tab page, select "Back up my MSN Chat record", click to open. (Figure 2) In the same way, the computer at home will also open the fast disk, turn on the "Back up my MSN Backup" switch, login MSN
Image transfer Image and graphics transmission Image transfer Video playback Support GPU Acceleration Support No Audio transmission Bidirectional voice can be controlled No Mouse control The client server can control Server-side control USB Transmission USB can be transmitted over the network No Encryption Communication can be encrypted using SSL No Spice's future fea
There are many well-known JVMs, but what we use most is Oracle's acquisition of Sun's hotspot.The memory in the hotspot is divided into 3 generations: the younger generation (young generation), the older generation (old generation), and the persistent generation (permanent generation). The object was originally in the younger generation, and the elderly agent deposited objects that were still live after several ge
". High efficiency is defined as: GC should occur frequently enough to avoid having a large number of allocated but useless objects (garbage) on the managed heap, resulting in unnecessary use of memory. The GC should be as infrequent as possible, avoiding the use of useful CPU time, even in the case of low memory-induced frequent GC. The GC should have an efficient output. If the GC reclaims only a small fraction of the memory, then the GC, including the CPU cycles it uses, is w
: GC should occur frequently enough to avoid having a large number of allocated but useless objects (garbage) on the managed heap, resulting in unnecessary use of memory. The GC should be as infrequent as possible, avoiding the use of useful CPU time, even in the case of low memory-induced frequent GC. The GC should have an efficient output. If the GC reclaims only a small fraction of the memory, then the GC, including the CPU cycles it uses, is wasted. Each time the GC shou
There are many well-known JVMs, but what we use most is Oracle's acquisition of Sun's hotspot.The memory in the hotspot is divided into 3 generations: the younger generation (young generation), the older generation (old generation), and the persistent generation (permanent generation). The object was originally in the younger generation, and the elderly agent deposited objects that were still live after several ge
A: A brief introduction to the Java Memory Area 1. HeapThe memory initially allocated by the JVM is specified by-XMS, which defaults to 1/64 of the physical memory.The maximum allocated memory for the JVM is specified by-XMX, which defaults to 1/4 of the physical memory.When the default free heap memory is less than 40%, the JVM increases the heap until the maximum limit of-xmx, which can be specified by the-xx:minheapfreeratio= parameter.When the default free heap memory is less than 70%, the J
Gesture Scaling (1), gesture Scaling ( Effect: font Scaling (countless times). At present, I have a custom multiple, but it is a bit of a BUG, and the scroollveiw sliding conflict is not solved; 1. activity_main.xml android:layout_width="match_parent" android:layout_height="match_parent"> android:id="@+id/textView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textSize="11sp" android:scrollbars="vertical" />
Vpay system technology. i56etc22.73 5296for,Vpay system code technology,PHP code of vpay System I. In-depth analysis of the bonus system of the vpay system: A. Static dividend (Release) 1. You can earn 80 yuan and 20 points in the registration form. You can manually redeem 80 yuan to earn points, which is 6 times larger. That is, you can increase your investment by 5 times, points are returned to the balance on a daily basis based on the decreasing principle of 2 ‰, and the balance can be circu
than 40%, the JVM will increase the heap until the maximum limit of-xmx can be specified by-XX: minheapfreeratio =.By default, when the free heap memory is greater than 70%, the JVM will reduce the minimum heap limit to-XMS, which can be specified by-XX: maxheapfreeratio =.Generally, the server sets-XMS and-xmx to be equal to each other to avoid adjusting the heap size after each GC. Therefore, the above two parameters are useless.Generational/heap Model Generational collection is a highlight o
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