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high-speed cache memory between the CPU register and the primary memory called the L1 cache, it can be accessed within 2-4 clock periods. Later, it was found that there was a large gap between the L1 high-speed cache and the primary storage, and a faster L2 cache was inserted between the L1 high-speed cache and the primary storage, it can be accessed within 10 clock cycles. Therefore, in this mode, the current storage system has been formed in the constant evolution. Now we can know that the

Write by nine days Yan Ling (jtianling) -- blog.csdn.net/vagrxie Discuss newsgroups and documents In fact, I have seen Bruce Eckel's article programming in the mid-future for a long time. The original article was published on February 10. as a programmer who is often controlled by boring curiosity, I have used my work or spare time to learn more than N languages. I often wonder what language

In Linux, how does one know what program a port is running? when we use netstat-an, we sometimes see similar output: www.2cto. comudp000.0.0.0: 327680.0.0.0: * but no such port is found in/etc/services. how can this problem be solved... in Linux, how does one know what

type modifier (typespecifier). It is designed to modify variables that are visited and changed by different threads. Variables defined by the volatile type are extracted directly from the corresponding memory each time the system uses it, rather than using the cache. After using the volatile modifier member variable, the values of the variables that all threads see at any time are the same. A demo sample using volatile

assignment statement s= "" is a reference to a string type that points to another string (the value of the string is "", or an empty string).Common written Questions:New String ("ABC") has created several objects?Answer: one or two. Assuming that there is an "ABC" in the constant pool, then just create an object, assuming that there

In Linux, how does one know what program a port is running? When we use netstat-an, we sometimes see similar output: www.2cto.com udp 0 0 0.0.0.0: 32768 0.0.0.0: * What should I do if I find that/etc/services does not have the port description? Is this a hacker

Repetitive LaborIn a main project, there are often multiple sub-functions of the entrance, which may be a button, there may be a drop-down menu.Initially developed, it must be easy to place a button on the interface, give it a name, and then write a piece of code into his click event to let the child function interface pop up.But as the number of sub-functions continues to change, this inconspicuous few small jobs, we are constantly repeating.The most headache

problems should be paid attention to in the design of ⑤ crawler The first problem is the standardization of URL addresses: On www, a URL address can have a variety of representations, can be represented by an IP address, can also be represented by a domain name. To prevent the crawler from repeatedly accessing the same address. The second problem is to avoid falling into the network trap: links on the netw

What is more time-saving about SQL statement judgment and program judgment? What is more time-saving about SQL statement judgment and program judgment? One 1,select if (age>10,name, ' ten ') as name from student; (MySQL SQL determ

MySQL added a few fields, in the client can be modified, but in the TP program cannot be modified, what is the reason? Check the log, error content is SQLState HY000 General error 2053 Reply content: MySQL added a few fields, in the client can be modified, but in the TP progra