Linux Processes and Threads

L inux processes and Threads

Process consists of a sequence of processes running on the kernel and kernel

A CPU running a process, multi-process means: In a cup can be multiple processes, (that is, multi-process) but it is switching to each other, but can cause a loss of performance, that is, a point in time can only run a process. 650) this.width=650; "src=" Http://s1.51cto.com/wyfs02/M00/7F/D8/wKiom1cv8TfD9juYAABEyoEKznU400.png "title=" Picture 1.png "alt=" Wkiom1cv8tfd9juyaabeyoekznu400.png "/>

The program executes inside the memory, and the process is described inside the kernel.

Thread: Lightweight process, which is the smallest unit in program execution. Multiple processes in the same process can execute concurrently.

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ready: Preparing to run

sopped: Stop State

Executing: Running process

Uninterruptible: Non-disruptive sleep

Interruptible:: can sleep interrupted

Zombie Process: Normally only restarts, freeing up resources

Commands in the process:

PSS Ps-aux Ps-al

Pstree Viewing the process tree

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PS-EF List Processes

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Ps-al

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S :R indicates in-run T: Process is stopped X: Process exited Z: Zombie Process

Top : Show programs in management execution

Jobs: Show Jobs

...& on behalf of background execution

CTRL + Z represents process pauses

CTRL + C on behalf of process termination

FG%jobnum backstage work in foreground processing

Kill-signal%jobnumber,PID

Signal:-9 means force kills the process

-15 End process with normal work

-17 pause process, equivalent to Ctrl + Z

-2 interrupt process, equivalent to CTRL+CR

Find process command:ps-ef | grep " "

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Linux Processes and Threads