Because of the growth in the home of Mr. Yin and Yang feng shui, Elders always give us some advice, which is listed here for your reference:
1. the mantra of my grandfather-heavy: I have not talked about my dream for three years, and the gods
Again, this article is pure water and published on the homepage to strongly Insert the RSS of the comrades. Advanced technologies will be released soonArticleMake up for today's time.
Although I have already started to work, but according to the
the middle-end mainstream installed program is popular with gamers, for this level of computer configuration, not only to meet the performance requirements, but also do not cause performance waste, cost-effective aspects of outstanding.
Cenozoic Recycling: (copy algorithm)
In the heap, the new generation mainly stores what is soon to be collected by GC or is not a particularly large object (whether the-xx:pretenuresizethreshold parameter is set). The new generation of the
so on.
4K Display
The ipad Pro uses the same approach when it comes to hardware updates for previous generations of ipads. Apple is expected to be equipped with an oversized display, according to TechRadar News that the IPad Pro not only uses a 12.9-inch screen, the resolution also uses two versions, including 2048x1536 pixels and 4096x3072 pixels, the latter apparently reached the 4K standard. However
June 29, 2017 is the 10 anniversary of the launch of the iphone. Fleeting, flash ten years have gone by. Recalling 2007, at the Macworld conference in San Francisco, Steve Jobs (Stevejobs) presented the world with a "widescreen touch ipod, revolutionary mobile phone, breakthrough internet communications equipment" in one of the cross-era product--iphone. For more than 10 years, the IPhone has greatly enriched the lives of people around the world, with cumulative sales exceeding 1 billion units.
determine the style of call, this is mainly used in iphone,ipads devices, such as the following application:
iphone and smartphones on the application
* * IPhone and Smartphones (portrait and Landscape)/@media screen and (min-device-width:320px) and (Max-device-wid th:480px) { //Your style is put here ... }
Max-device-width refers to the entire render area width of the device (the actual width of the device)
On the application of
CSS3 Media Queries Template
CSS3 Media queries generally use the "Max-width" and "Min-width" two properties to check the resolution size of various devices and the conditions set by the style sheet, and call the appropriate style if satisfied. For example, if your Web page in the 960px screen display, then first through the CSS3 Media queries query to see if there is a set of this condition style, if found corresponding, will adopt the corresponding style, the other equipment is the same reason
1. About the left eye of Kakashi:
Kakashi's teammate called Yu zhibo and sacrificed to protect kakaka in the battle with the land of thunder, after his death, the only wheel of his eye was left to Kaka. (In the battle, Kaka and the Earth lost one eye ). KaKa finally died under the "White Tiger" to protect kai (strong eyebrows.
2. About Xiao organization.
Who is the leader of Xiao organization? Let me tell you. It is the fourth generation of huoying. (Don't ask questions, let's look down.) The f
Article Introduction: breakpoints in responsive rely on CSS3 media queries to decide. Media ipads from media queries and Ipones and queries, which have been CSS3 media queries templates, created CSS3 using the EM unit, have been introduced in this regard.
Responsive Design is more and more popular in modern web design, but the students do not understand its real design concept, often regard responsive as an adaptive layout. Of course, a lo
meaning of JVM parameters is shown in example analysis
Parameter name
Meaning
Default value
-xms
Initial Heap Size
1/64 of physical Memory (
The default (minheapfreeratio parameter can be adjusted) when the free heap memory is less than 40%, the JVM increases the heap until the maximum limit of-xmx.
-xmx
Maximum Heap Size
Physical memory of the quarter (
The default (maxheapfreeratio parameter can be adjuste
JVM Memory composition and GC-related content see previous articles: JVM memory composition GC Policy memory request.Example of the meaning of JVM parameters is shown in example analysis
Parameter name
Meaning
Default value
-xms
Initial Heap Size
1/64 of physical Memory (
The default (minheapfreeratio parameter can be adjusted) when the free heap memory is less than 40%, the JVM increases the heap until the maximum limit of-xmx.
young, old, and persistent generations, using different algorithms (one of these methods) for different life cycle objects. The current garbage collector (starting with j2se1.2) uses this algorithm.
sub-generational garbage collection detailsAs shown, it is distributed across generations in the Java heap.
Young (Young Generation)The young generation is divided into three districts. One Eden
Heap memory Setting principle JVM heap memory is divided into 2 blocks: Permanent space and heap space.
Permanent is the persistent generation (Permanent Generation), which mainly holds Java class definition information, which is not related to the Java objects that the garbage collector collects.
Heap = {old + new = {Eden, ' from ', to}},old is the older Generation, NEW is the young Generation (Generation). The division of old generations
size is 64m, so increasing the younger generation will reduce the size of older generations. This value has a large impact on system performance, and Sun's official recommendation is 3/8 for the entire heap.
-xss128k: sets the stack size for each thread. After JDK5.0, each thread has a stack size of 1M, before each thread has a stack size of 256K. The size of the memory required for the more applied threads to be adjusted. In the same physical
CLR requires that all 0 generations of objects be in one memory segment, the current allocated memory segment is full, a new memory segment is created, and the original memory segment is recycled for 2 generations. This is not a good implementation, because we have no other way than to reduce memory allocation.
The most important rule
There is a basic rule for high-performance programming for garbage c
Heap Settings
-xmx3550m: Set JVM maximum heap memory to 3550M.
-xms3550m: Set the JVM initial heap memory to 3550M. This value can be set to the same as-xmx to avoid the JVM reallocating memory after each garbage collection completes.
-xss128k: Sets the stack size for each thread . After JDK5.0, each thread stack size is 1M, before each thread stack size is 256K. Adjustments should be made based on the size of memory required by the application's thread. In the same physical memory, re
Concept:Device-pixel-ratio: Defines the ratio of the visual width to the visible height of the input device screen.Device-width: Enter the visual width of the device screen.Orientation: The screen is oriented vertically. Landscape is horizontal, Portrait is Portrait "ipad opposite"/* IPhone 4 ——— –*/@mediaOnly screen and (-webkit-min-device-pixel-ratio:1.5),Only screen and (min-device-pixel-ratio:1.5) {/*styles*/}/* IPads (Portrait) ——— –*/@media only
Heap memory Setting principle JVM heap memory is divided into 2 blocks: Permanent space and heap space.
Permanent is the persistent generation (Permanent Generation), which mainly holds Java class definition information, which is not related to the Java objects that the garbage collector collects.
Heap = {old + new = {Eden, ' from ', to}},old is the older Generation, NEW is the young Generation (Generation). The division of old generations
Heap Memory settingsPrincipleJVM heap memory is divided into 2 blocks: Permanent space and heap space.
Permanent is the persistent generation (Permanent Generation), which mainly holds Java class definition information, which is not related to the Java objects that the garbage collector collects.
Heap = {old + new = {Eden, ' from ', to}},old is the older Generation, NEW is the young Generation (Generation). The division of old generations
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