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Transferred from: https://www.cnblogs.com/sparkbj/p/6148817.html

To get the 10 processes that consume the most CPU resources under linux, you can use the following command combination:

Ps aux | head-1 + PS aux | grep-v PID | sort-rn-k + 3 | head

To get the 10 processes that consume the most memory resources under linux, you can use the following command combination:

Ps aux | head-1 + PS aux | grep-v PID | sort-rn-k + 4 | head

Command combination parsing (the same is true of MEN for CPU):

Ps aux | head-1 + PS aux | grep-v PID | sort-rn-k + 3 | head

This command combination is actually the following two commands:

Ps aux | head-1

Ps aux | grep-v PID | sort-rn-k + 3 | head

You can use the command to find the 10 processes that use the most memory

View the processes that take up the highest cpu

Ps aux | head-1 + PS aux | grep-v PID | sort-rn-k + 3 | head

Or top (then press M, notice that this is uppercase)

View the processes with the highest memory footprint

Ps aux | head-1 + PS aux | grep-v PID | sort-rn-k + 4 | head

Or top (then press P, notice that this is uppercase)

This command combination is actually the following two commands:

Ps aux | head-1

Ps aux | grep-v PID | sort-rn-k + 3 | head

The first sentence is mainly to get the title (USER PID% CPU% MEM VSZ RSS TTY STAT START TIME COMMAND).

The next grep-v PID removes the title from the ps aux command, that is, the grep does not contain the three-letter combination of lines, and sorts the results using sort.

Sort-rn-k + 3 the r of-rn in this command is the reverse order of the results, n is sorted by numeric size, and-k + 3 is sorted for the contents of the third column, and then use the head command to get the first 10 rows of data by default. (the | indicates the pipeline operation)

Supplement: content explanation

PID: the ID of the process

USER: process owner

PR: the priority of the process. The smaller the priority is, the more priority it is to execute.

NInice: valu

VIRT: virtual memory consumed by the process

RES: physical memory consumed by the process

SHR: shared memory used by the process

S: status of the process. S indicates hibernation, R indicates running, Z indicates dead state, and N indicates that the priority value of the process is negative

% CPU: CPU usage occupied by the process

% MEM: percentage of physical memory and total memory used by the process

TIME+: the total CPU time taken after the process was started, that is, the cumulative value of the CPU usage time occupied.

COMMAND: name of the process startup command

You can use the following command to find out the K processes that use the most memory

Method 1:

Ps-aux | sort-k4nr | head-K

If it's 10 processes, Knights 10, if it's the highest three, Knights 3.

Description: in ps-aux (a refers to all processes of all--, u refers to the user of userid-- executing this process, id,x refers to all programs, not distinguished by terminal)

The output format of ps-aux is as follows:

USER PID% CPU% MEM VSZ RSS TTY STAT START TIME COMMANDroot 1 0.0 19352 1308? Ss Jul29 0:00 / sbin/initroot 2 0.0 0.0 00? S Jul29 0:00 [kthreadd] root 3 0.0 0.0 00? S Jul29 0:11 [migration/0]

In sort-k4nr (k represents the starting position, followed by the number 4 is its starting position, if not, the end position defaults to the last; n refers to numberic sort, sorted according to its numerical value; r refers to reverse, here it refers to the reverse comparison result, the output defaults from small to large, and reverse from big to small. ). In this example, you can see that% MEM is in the fourth position, sorted from largest to smallest according to the value of% MEM.

Head-K (K refers to the number of lines, that is, outputs the results of the first few digits)

| as a pipe symbol, import the query result to the following command for the next step.

Method 2:top (then press M, note uppercase)

2. You can use the following command to find out the K processes that use CPU most

Method 1:

Ps-aux | sort-k3nr | head-K

Method 2:top (then press P, note uppercase

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