t400 memory

I. OverviewThe Java Virtual machine performs a Java program by dividing the memory it manages into several different data regions that have their own purpose and time for creation and destruction. The memory managed by the Java Virtual machine will include the following runtime data regions, as shown in:The following is a description of each area.Second, run-time Data Area program counterThe program counter

Problem introduction: Question 1: String str1 = "ABC ";String str2 = "ABC ";System. Out. println (str1 = str2); // true Question 2: String str1 = new string ("ABC ");String str2 = new string ("ABC ");System. Out. println (str1 = str2); // false Question 3: String S1 = "Ja ";String S2 = "va ";String S3 = "Java ";String S4 = S1 + S2;System. Out. println (S3 = S4); // falseSystem. Out. println (s3.equals (S4); // true As the above problems made me vague, I specially collected some information about

Improving program performance and caching -- Starting from the memory structure Source: http://www.cnblogs.com/yanlingyin/ Opening Previous blog Local Principle Analysis-basic quality of good code ModerateProgramA Brief Introduction to locality is provided. Basically, I have learned how to write a localCode. But why can code with good locality be efficient? This question will be answered in this blog. As for the organization and implementati

Some cases require a large number of fixed-size blocks of memory that are very inefficient to use with malloc, which is a good fit for a memory pool solution.Here is the full source of a memory pool with a fixed memory block size. Note: The memory application is not used by

First let's look at a problem: the output of the following code, Copy CodeThe code is as follows: Var_dump (Memory_get_usage ()); $a = "laruence"; Var_dump (Memory_get_usage ()); unset ($a); Var_dump (Memory_get_usage ()); The output (on my PC, may vary depending on the system, PHP version, load extension): Int (90440) Int (90640) Int (90472) Notice 90472-90440=32, so there are a variety of conclusions, some people say that PHP unset does not really release

Python memory management analysis and python Memory Management This article analyzes in detail the python memory management mechanism. Share it with you for your reference. The specific analysis is as follows: Memory Management is a crucial part of a dynamic language such as Python. It even determines the execution eff

Reference content Address: http://www.importnew.com/16433.htmlReference content Address: http://www.cnblogs.com/start1225/p/6690282.htmlReference content Address: http://www.cnblogs.com/ydpvictor/archive/2012/09/09/2677260.htmlI. OverviewThe Java Virtual machine performs a Java program by dividing the memory it manages into several different data regions that have their own purpose and time for creation and destruction. The

transferred from: http://blog.csdn.net/myarrow/article/details/86828191. First Fit SplitterThe first fit allocator is the most basic memory allocator, which uses bitmap instead of a free block list to represent memory. In bitmap, if the page corresponds to a bit of 1, the page is already assigned, and 0 indicates that the page is not assigned. In order to allocate a block of

when choosing the memory in the DIY assembly configuration process, we usually see the Kingston memory collocation. No doubt, at present many computer configuration users are like Kingston memory bar. But some friends will find that there are two kinds of memory in Kingston, a direct write Kingston

Lua Memory leaks First 1th, the memory leaks in Lua are essentially different from what we call the memory leaks in C + +. There is a garbage collection mechanism (GC) in Lua, so there is no memory leak in theory. When it does GC, it scans all the objects from the root, and if there is a reference to the object somewh

Original address: http://www.cprogramming.com/debugging/valgrind.html The translation will inevitably be due to personal level and there are inaccurate places, please more criticism, the above is the original link, we can also go directly to see. Valgrind is a multi-purpose code review and memory debugging tool for Linux platforms. It can run your program in Valgrind's own environment, monitoring malloc/free, (New/delete for C + +) and other

1. [CPU usage]CPU usage percentage. The bar chart shows the real-time CPU usage.2. [CPU usage record]CPU usage changes over time. The red line indicates the usage of the system kernel (you need to click the View menu of task manager in the red line and select "show Kernel Time ).3. [pf usage]PF is short for page files. This number is easy to misunderstand and is considered the size of the page file used by the system at the time. The correct description should be: the sum of physical

Garbage collection GC:. Net Automatic Memory Management (I) Memory AllocationPreface GC in. Net completely solves the embarrassment of developers tracking memory usage and controlling memory release. However, you may want to understand how GC works. This series of articles will explain how

Common kernel memory allocation functions1)_get_free_pages is the most primitive memory allocation, to level two gets the original page box from the partner system, and the return value is the starting address of the first page box. _get_free_pages only encapsulates the alloc_pages function on the implementation , and alloc_pages The allotted length is 1 2) kmem_cache_alloc slab Allocator is a

1. Memory Optimization principle To optimize application memory use, developers should first know what the most memory of the application, the answer is the texture. Textures can occupy almost 90% of the applied memory. So minimize the application of the texture memory usa

Android memory, Android memory I haven't written it for a long time. I don't forget it, I'm not lazy, because I am confused ~~ I don't know what to learn, what to write, what to do, and what to do. I am stupid, I don't know how to tell others what I will, and I am willing to share it with others. So I will write it out. No matter what is right or wrong, I hope everyone can take the best of it to get rid of

Garbage collection GC:. NET automatic memory management on (a) memory allocationObjective. NET, the GC completely solves the embarrassment that the developer keeps track of memory usage and controls the release of memory. However, you may want to understand how the GC works. This series of articles will explain how

Introduction of the problem: Question one: String str1 = "abc";String str2 = "abc";System.out.println (STR1==STR2); True Question two: String str1 =new string ("abc");String str2 =new string ("abc");System.out.println (STR1==STR2); False Question three: String S1 = "Ja";String s2 = "va";String s3 = "Java";String S4 = s1 + s2;System.out.println (s3 = = S4);//falseSystem.out.println (S3.equals (S4));//true Because the above problem makes me ambiguous, so I specially collected some information abou

First, the basic concept Physical addresses (physical address) are used for memory chip-level cell addressing, which corresponds to the address bus that the processor and CPU are connected to. This concept should be one of the best understanding of these concepts, but it is worth mentioning that although the physical address can be understood directly into the machine on the memory itself, the