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Microsoft Asia Technical Center interview questions !!!1. Differences between processes and threads.A thread is an execution unit in a process and a schedulable entity in the process.Differences from processes:(1) scheduling: A thread is the basic unit of scheduling and allocation, and a process is the basic unit of resource ownership.(2) concurrency: not only can concurrent execution be performed between p
data sent by the listener does not need to decrypt to see the content. How do you virtualize a Linux physical machine? Tell me some weird linux commands. Explains how HTTPS works. http://blog.csdn.net/sean_cd/article/details/6966130How HTTPS works Do you know Tor browser? Explain how it works. How do I trigger a forced system check the next time I start the machine? What backup technology do you like? Master-slave replication tape dri
I. Application of the factory model in development Interview Questions:Write a simple calculator. Code implementation: Abstract An operation class: Package COM. qianyan. calcuator; public abstract class operation {// number one private double num1; // number two private double num2; Public double getnum1 () {return num1;} public void setnum1 (double num1) {This. num1 = num1;} public double getnum2 () {return num2;} public void setnum2 (double num2)
the dispatch of the operating system. This is the design, greatly improve the CPU utilization, the process is to achieve multi-channel programming on the CPU proposed, the process is still a lot of defects, mainly embodied in two points: 1, the process can only do one thing at a time, if you want to do two things at once or many things, the process will be powerless. 2, if the process is blocked during exe
the same time, under the operation of the operating system, can be implemented concurrently. This is the design that greatly improves the CPU utilization, process is in order to achieve multi-channel programming on the CPU, the process is still a lot of defects, mainly reflected in two points: 1, the process can only do one thing at a time, if you want to do two or more things at the same time, the process
. Synchronize the data between the main library and the library, and then repeat the action again13. Use a single command to turn off all services except SSHD, Crond, network, Rsyslog services (no power-on automatic)Method One:[[Email protected]~]# for name in ' Chkconfig–list|grep 3:on|awk ' {print '} ' |grep-ev "sshd|crond|rsyslog|network" ';d och Kconfig $name Off;done[Email protected]~]# chkconfig–list|grep 3:onCrond 0:off 1:off 2:on 3:on 4:on 5:on 6:offNetwork 0:off 1:off 2:on 3:on 4:on 5:o
as 2:32 below, indicates how long the system has been running since the last start.[[email protected] DOWNLOAD] #uptime02:05:22 up 2:32, 2 users, Load average:0.00, 0.00, 0.0014. How to add route in Linux systemHost routingRoute add-host 192.168.197.100 Dev eth0Gateway RoutingRoute add default GW 192.168.197.1Network routingRoute ad-net 192.168.1.0 netmask 255.255.255.0 deveth1Route ad-net 192.168.1.0 netmask 255.255.255.0 gw192.168.197.115. The cont
://www.baidu.com/s?wd=test on the specified server 61.135.169.121, and the time-out for the access is 20 seconds: Curl–connect-timeout Http://61.135.169.121/s?wd=test 9. With the netstat command with other shell commands, according to the source IP statistics all the established status links to 80 ports, the output is similar (the first column number of connections, the second column IP): [Email protected]~]# Netstat-an|grep establishedTCP 0 139.224.199.85:22 101.47.33.86:
. Therefore, A total of 12 traffic signals are generated in the system. The traffic lights at the right bend are evergreen, that is, they are always red. No matter where the program gets the lights in a certain direction, each time it gets the same instance object, it is very convenient for the Lamp class to use enumeration, there are always only instance objects that represent the lights in 12 directions. Design
Collection in Mongo is equivalent to a MySQL table. When I have the following requirements, how should I design my collection and fields (keyvalue structure )? Scenario and Requirement Description: record the user's Business ID and ip address for each login, as well as the specified qid for the login time, and check whether the ip address already exists.
Questions Guide:1.flume-ng and Scribe, where is the advantage of Flume-ng?2. What issues should be considered in architecture design considerations?3.Agent How can I fix it?Does 4.Collector panic have an impact?What are the measures for 5.flume-ng reliability (reliability)?The U.S. mission's log collection system is re
Basic article: Operating system, computer network, design modeOne: Operating system1. What is the status of the process, the state transition diagram, and the event that caused the conversion.2. The difference between a process and a thread.3. Process communication in several ways.4. Thread synchronization in several ways. (Must write producer, consumer problem, completely digest understanding)5. How thread
The U.S. mission's log collection system is responsible for the collection of all business logs from the company and provides real-time data streams to the Hadoop platform for offline data and storm platforms. The American mission's log collection system is based on flume
Design of High-Speed Data Collection System Based on USB2.0 and FPGA technology [Date:] Source: Electronic Technology Application Author: Yuan Jiangnan [Font:Large Medium Small] In recent years, laptop computers have been rapidly popularized and updated, most of which do not have RS232 interfaces configured, and USB interfaces have become t
System design changes and changes (answer questions about golden ocean) The scope of our discussion is to design database-based applications. There are still many applications that will not be implemented based on databases, so we will not discuss them for the moment,In the previous discussions on hierarchical
Software Design of wireless data collection system for SimpliciTI network protocol The software consists of three parts: Control Center, terminal node, and route node software. 1 Control Center The control center constantly monitors how many node devices are added and determines whether the devices are full. If the data center still has idle ports, the PORT is al
Design of wireless data collection system for SimpliciTI network protocol With the modernization of production technology, monitoring systems under various production environment conditions are also evolving. Traditional monitoring systems mostly adopt wired methods. The emergence of wireless sensor networks provides a better choice. Compared with traditional wir
the number, change the status from 0 to 1, and the rest unchanged;Option 3: Modify the requirement status of the number, change the status from 0 to 2, and the rest unchanged;.(7) Define Showinforamtion () method to print display all technical requirements information; (3Score of(8) define selectinforamtion () to inquire the details of the technical requirement information. (2Score ofPrompt user to enter technical requirement information number:Displays the details of the technical information
A crm system has data design problems, such as a question, an employee table containing employee ID, name, phone number, address, department, and other information. If the department is not the headquarters, you need to continue reporting. Now we need to design a database: 1. select an employee and write the report chain of the employee. 2. if a department manage
microcontroller. A/D Conversion The A/D conversion module is integrated into the pic18f4550 and is the main component of the data collection circuit. A 40-pin pic18f4550 built-in analog-to-digital converter with 13 inputs and 10-bit digital output. I2C bus interface, SPI interface, I/O interface 1) I2C bus I2C bus is a two-wire serial bus that transmits data between devices connected to the bus through SDA and SCL. Each device is identified
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