cobit processes

Process (process) and threads (thread ) are the basic concepts of the operating system, but they are abstract and difficult to master. Recently, I read a piece of material and found that there is a good analogy that can be explained in a clear and understandable way. 1.The core of the computer is the CPU, which takes on all the computational tasks. It's like a factory that's always running.2.Assuming that the plant has limited power, it can only supply one workshop at a time. In other words, whe

1: To understand multi-threading, you must first understand the thread, and to understand the thread, you must first understand the process, because the thread is dependent on the process and exists.2: What is a process?Through the Task Manager we see the existence of the process.By observing, we find that only the running program will appear.Process: Is the program that is running.A process is an independent unit of system resource allocation and invocation. Each process has its own memory spac

The command to get the total number of currently running processes is:-lThe source code for the total number of currently running processes is as follows:#include #include #include #include #include #include intMainintargcChar*argv[]) {DIR *DP;structDirent *dirp;intI, Len,count =0;if(DP = Opendir ("/proc")) = = NULL) {fprintf(stderr,"%s file%d line%s", __file__,__line__, Strerror (errno));Exit(1); }printf("

1. The Linux down-fetch process consumes the highest CPU of the top 10 processesPS Aux|head-1;ps aux|grep-v pid|sort-rn-k +3|headPS Auxw|head-1;ps auxw|sort-rn-k3|head-102.linux the top 10 processes taking up memory (MEM)PS Aux|head-1;ps aux|grep-v pid|sort-rn-k +4|headPS Auxw|head-1;ps auxw|sort-rn-k4|head-103. The top 10 processes that use the most virtual memoryPS Auxw|head-1;ps auxw|sort-rn-k5|head-104.

2012-11-19 15:38:04 Category: LINUX1. Top 10 CPU-intensive processes: PS Auxw|head-1;ps auxw|sort-rn-k3|head-10 2. The top 10 processes of memory consumption PS Auxw|head-1;ps auxw|sort-rn-k4|head-1 0 3. The top 10 processes for virtual memory use PS Auxw|head-1;ps auxw|sort-rn-k5|head-10 4. You can also try PS auxw--sort=rss PS auxw--sort=%cpu 5. Take a look at

I. Definition of processes and threadsA process is an executing program: A program is a text that describes an instruction, a static concept that runs the instruction, gets a process each time it runs, and the process is a dynamic concept; the operating system assigns resources to the process.A thread is a piece of code that is actually executed in a process: it is also a dynamic concept; the operating system dispatches and dispatches threads, allocat

Program: A static code, a set of ordered sets of instructions, which itself does not have any meaning of running, it is just a static entity, is the application of software implementation of the blueprint. process: is a dynamic execution of a program, which corresponds to loading from code, execution to completion of a complete process, is a dynamic entity, it has its own lifecycle. It is created because it is scheduled to run, is waiting for a resource or event, and is undone due to completion

How to view zombie processes on Linux systems, how many zombie processes are counted?#ps-ef | grep defunctOr looking for a process with a status of Z, Z is the meaning of the zombie process representing zombie process.In addition, using the top command to view a column is S, if the status of Z indicates that it is a zombie process.tasks:95 Total, 1 running, 94 sleeping, 0 stopped, 1617 zombieThe zombie proc

relationship of process and thread:(1) A thread can belong to only one process, while a process may have multiple threads, but at least one thread. (2) A resource is allocated to a process, and all the threads of the same process share all the resources of that process. (3) The processor is assigned to a thread, that is, a thread that is actually running on the processing machine. (4) Threads need to be synchronized during execution. Synchronization is achieved between threads of different

Easy to understand, suitable for beginners to read. Highly recommended. 5+ Star.Disclaimer: This article is seen elsewhere, transferred from Ruan Yi Feng blog.Source: http://www.ruanyifeng.com/blog/2013/04/processes_and_threads.html1.The core of the computer is the CPU, which takes on all the computational tasks. It's like a factory that's always running.2.Assuming that the plant has limited power, it can only supply one workshop at a time. In other words, when a workshop is started, other works

BackgroundWe know that when a process fork out of a child process, there is no child process to recycle, then the state after the child process has finished running becomes a zombie process.We can use wait and waitpid to reclaim the child process and prevent the zombie process from appearing.But wait and waitpid, either running in a blocking fashion or running in polling mode, are taking up CPU resources very much.This article describes how a parent process recycles a child process through an as

(Process class under the System.Diagnostics namespace)"1" gets all processes on the local machine 1 progress[] myprogress = progress.getprocesses ();"2" gets the process of the name specified on the local computer 1 process[] myprocess = Process.getprocessesbyname (" process name ");Example: 1 process[] myprocess = Process = Process.getprocessbyneme ("notepad++" );"3" gets all the processes of the remote c

The top 10 processes that occupy the most 1.CPU:PS Auxw|head-1;ps auxw|sort-rn-k3|head-102. Top 10 processes with the most memory consumptionPS Auxw|head-1;ps auxw|sort-rn-k4|head-103. The top 10 processes that use the most virtual memoryPS Auxw|head-1;ps auxw|sort-rn-k5|head-104. You can also tryPS Auxw--sort=rssPS Auxw--sort=%cpu5. Take a look at a few paramete

A: What is a processA process is the basic unit of allocation of resources (CPU, memory, and so on), which is an instance of program execution.When the program runs, the system creates a process, assigns IT resources, and then puts the process into the process-ready queue.When the process scheduler selects it, it allocates CPU time and the program starts to actually run.Two: What is a threadA thread is the smallest unit of execution of a program, which is an execution flow of a process, and is t

Processes and Threads Concurrency and parallelismParallelism is where multiple events occur at the same time, and concurrency occurs during the same interval. Basic features of the operating system 并发Program Concurrency execution 共享Two ways of mutually exclusive sharing and simultaneous access 虚拟Time Division Multiplexing Technology and Space Division multiplexing technology 异步Process asynchronous execution, stop and

The First explains two concepts: Swap: In Linux, when there is not enough physical memory and a new program requests to allocate memory, Linux chooses to exchange data that is temporarily unused by other programs to the physical disk (swap), and then read it when it is used ( Swap in). The disadvantage of this is obvious, swap in/swap out here the cost is relatively large, compared to the data has been placed in memory, read more disk operations, and disk IO costs. We all know that. Oom:out o

When a process calls the Exit command to end its own life, it is not actually destroyed, but it leaves behind a data structure that becomes zombie. The zombie process is a very special kind of because it has given up almost all of the memory space, no executable code, can not be scheduled, only in the process list to keep a position, log the process of the exit status and other information for other processes to collect, in addition, the zombie proces

Turn from: http://blog.csdn.net/yanook/article/details/6585648 GDB is very powerful, this article mainly introduces the use of GDB to debug signals, multiple processes, multithreading, specifically as follows: (a) signal GDB has the ability to process any kind of signal when you debug the program, and you can tell GDB which signal to process. You can request GDB to receive the signal you have specified, and immediately stop the running program for y

A process is the basic execution entity of a program and a container for threads. 1) The program is an ordered set of instructions and data, which itself does not have any meaning of running, is a static concept. The process is a process of execution of the program on the processing machine, it is a dynamic concept.2) The program can be used as a software data for a long time, and the process is a certain life cycle. The program is permanent and the process is temporary.3) The process can descr