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In linux, you can use the cat command to see how many processes are supported, which can connect files and print to the output device with the syntax "cat / proc/sys/kernel/pid_max"; this command shows the maximum number of processes supported by the system, and the result is a theoretical value due to memory and other system resources.

The operating environment of this tutorial: linux7.3 system, Dell G3 computer.

How does linux check how many processes are supported

In linux systems, the total number of processes has a maximum number.

You can view it with the following command:

Cat / proc/sys/kernel/pid_max

The system uses pid_t to represent the process number, then the maximum number of processes certainly cannot exceed the type of pid_t. Using the cat / proc/sys/kernel/pid_max command to check the maximum number of processes supported by the system will generally be very large, equivalent to the theoretical value. At the same time, due to memory and other system resources constraints, there will not be so many processes at the same time.

Expand knowledge:

Ulimit-n can see how many file descriptors a process can open, and this command can view the maximum number of processes on the system.

This is a soft limit and can be changed. That is to say, there can be up to 1024 processes on my machine, but you can change the soft limit on the number of processes by changing the value of this parameter, for example, using the following command to change the soft limit to 4096 processes-ulimit-u 4096.

The cat (English spelling: concatenate) command is used to connect files and print to standard output devices.

Grammatical format

Cat [- AbeEnstTuv] [--help] [--version] fileName

Parameter description:

-n or-- number: number the number of lines of all output starting with 1.

-b or-- number-nonblank: similar to-n, except that blank lines are not numbered.

-s or-- squeeze-blank: when you encounter blank lines with more than two consecutive lines, replace them with blank lines on one line.

-v or-- show-nonprinting: use ^ and M-symbols, except for LFD and TAB.

-E or-- show-ends: displays $at the end of each line.

-T or-- show-tabs: displays the TAB character as ^ I.

-A,-- show-all: equivalent to-vET.

-e: equivalent to the "- vE" option

-t: equivalent to the "- vT" option

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