Programmer Think

I thought it might be a log problem, but there is no evidence to support it. The trace command can monitor the time consumption of each step, and can cooperate with the conditional expression to print a detailed log when the time consumption exceeds xx ms. Find a machine, enter a command, and then wait. When rt spikes appear again, the time-c ...

When it comes to virtual machine tools, VMware is naturally the most familiar. It has many powerful functions. What I recognize most is that it is very convenient to modify the configuration of the virtual machine to make the virtual machine achieve its desired performance ~ ~ But VMware is really easy to use, but you have to pay! It's not che ...

Most of us will follow interface programming in normal development, which can facilitate the implementation of dependency injection, polymorphism and other small skills, but this is at the expense of performance in exchange for code flexibility. Everything has Yin and Yang. It depends on your application scenario. 1: Background 1. Reason Du ...

The songs we want to listen to are only available in specific music software, but we don't think it's too troublesome to download the software. It's easy to say that Python can implement it casually! We take Qiuqiu music as an example to do a function of searching and downloading music. Before we start, we recommend a place for communication. ...

Memo mode Reference [1] bugstack.cn/md/develop/... [2] c.biancheng.net/view/1397.h... [3] refactoringguru.cn/design-patt... [4] cmsblogs.com/article/140... [5] blog.csdn.net/lovelion What is memo mode? Memo mode is a behavior design mode, which allows saving and restoring the previous state of an object without exposing the implement ...

Note: all the following contents are from personal superficial understanding of the use of binary search, for personal reference only! Don't spray if you don't like it. Welcome to correct it! 1, The situations suitable for binary search are divided into two categories: 1. Obvious conditions: The array is ordered and clearly tells you that th ...

Spider What is it? Spider Is a basic class provided by scripy, and other basic classes contained in scripy (such as CrawlSpider )And custom spider s must inherit this class. Spider Is a class that defines how to crawl a website, including how to crawl and how to extract structured data from its web pages. The source code is as follows: The ...

1, Thread safety is embodied in three aspects 1. Atomicity: provides mutually exclusive access. Only one thread can operate on data at a time (atomic,synchronized); 2. Visibility: a thread's modification of main memory can be seen by other threads in time (synchronized,volatile); 3. Orderliness: one thread observes the execution order of ...

``` Name of class: obj.SonClass private int getSonAge( ) private void setSonAge( int arg0, ) public void printSonMsg( ) private void setSonName( java.lang.String arg0, ) private java.lang.String getSonName( ) ``` 3, Accessing or manipulating private variables and methods of a class ================ In the above, we successfully ob ...

background The company has a channel system, which is specially connected with three-party channels. There is no business logic. It mainly works on message conversion and parameter verification, which plays a connecting role. Recently, after optimizing the response time of the interface and the code, the time still can not meet the requiremen ...