如何测量应用程序或进程的实际内存使用情况？

Question

How do you measure the memory usage of an application or process in Linux?

From the blog article of Understanding memory usage on Linux , ps is not an accurate tool to use for this intent.

Why ps is "wrong"

Depending on how you look at it, ps is not reporting the real memory usage of processes. What it is really doing is showing how much real memory each process would take up if it were the only process running . Of course, a typical Linux machine has several dozen processes running at any given time, which means that the VSZ and RSS numbers reported by ps are almost definitely wrong .

_{(Note: This question is covered here in great detail.)}

Answer 1

This question is covered here in great detail.

How do you measure the memory usage of an application or process in Linux?

From the blog article of Understanding memory usage on Linux , ps is not an accurate tool to use for this intent.

Why ps is "wrong"

Depending on how you look at it, ps is not reporting the real memory usage of processes. What it is really doing is showing how much real memory each process would take up if it were the only process running . Of course, a typical Linux machine has several dozen processes running at any given time, which means that the VSZ and RSS numbers reported by ps are almost definitely wrong .

Answer 2

This question is covered here in great detail.

How do you measure the memory usage of an application or process in Linux?

From the blog article of Understanding memory usage on Linux , ps is not an accurate tool to use for this intent.

Why ps is "wrong"

Depending on how you look at it, ps is not reporting the real memory usage of processes. What it is really doing is showing how much real memory each process would take up if it were the only process running . Of course, a typical Linux machine has several dozen processes running at any given time, which means that the VSZ and RSS numbers reported by ps are almost definitely wrong .

Answer 3

This question is covered here in great detail.

How do you measure the memory usage of an application or process in Linux?

From the blog article of Understanding memory usage on Linux , ps is not an accurate tool to use for this intent.

Why ps is "wrong"

Depending on how you look at it, ps is not reporting the real memory usage of processes. What it is really doing is showing how much real memory each process would take up if it were the only process running . Of course, a typical Linux machine has several dozen processes running at any given time, which means that the VSZ and RSS numbers reported by ps are almost definitely wrong .

Answer 4

This question is covered here in great detail.

How do you measure the memory usage of an application or process in Linux?

From the blog article of Understanding memory usage on Linux , ps is not an accurate tool to use for this intent.

Why ps is "wrong"

Depending on how you look at it, ps is not reporting the real memory usage of processes. What it is really doing is showing how much real memory each process would take up if it were the only process running . Of course, a typical Linux machine has several dozen processes running at any given time, which means that the VSZ and RSS numbers reported by ps are almost definitely wrong .

Answer 5

This question is covered here in great detail.

How do you measure the memory usage of an application or process in Linux?

From the blog article of Understanding memory usage on Linux , ps is not an accurate tool to use for this intent.

Why ps is "wrong"

Depending on how you look at it, ps is not reporting the real memory usage of processes. What it is really doing is showing how much real memory each process would take up if it were the only process running . Of course, a typical Linux machine has several dozen processes running at any given time, which means that the VSZ and RSS numbers reported by ps are almost definitely wrong .

Answer 6

This question is covered here in great detail.

How do you measure the memory usage of an application or process in Linux?

From the blog article of Understanding memory usage on Linux , ps is not an accurate tool to use for this intent.

Why ps is "wrong"

Depending on how you look at it, ps is not reporting the real memory usage of processes. What it is really doing is showing how much real memory each process would take up if it were the only process running . Of course, a typical Linux machine has several dozen processes running at any given time, which means that the VSZ and RSS numbers reported by ps are almost definitely wrong .

Answer 7

This question is covered here in great detail.

How do you measure the memory usage of an application or process in Linux?

From the blog article of Understanding memory usage on Linux , ps is not an accurate tool to use for this intent.

Why ps is "wrong"

Depending on how you look at it, ps is not reporting the real memory usage of processes. What it is really doing is showing how much real memory each process would take up if it were the only process running . Of course, a typical Linux machine has several dozen processes running at any given time, which means that the VSZ and RSS numbers reported by ps are almost definitely wrong .

Answer 8

This question is covered here in great detail.

How do you measure the memory usage of an application or process in Linux?

From the blog article of Understanding memory usage on Linux , ps is not an accurate tool to use for this intent.

Why ps is "wrong"

Depending on how you look at it, ps is not reporting the real memory usage of processes. What it is really doing is showing how much real memory each process would take up if it were the only process running . Of course, a typical Linux machine has several dozen processes running at any given time, which means that the VSZ and RSS numbers reported by ps are almost definitely wrong .

Answer 9

This question is covered here in great detail.

How do you measure the memory usage of an application or process in Linux?

From the blog article of Understanding memory usage on Linux , ps is not an accurate tool to use for this intent.

Why ps is "wrong"

Depending on how you look at it, ps is not reporting the real memory usage of processes. What it is really doing is showing how much real memory each process would take up if it were the only process running . Of course, a typical Linux machine has several dozen processes running at any given time, which means that the VSZ and RSS numbers reported by ps are almost definitely wrong .

Answer 10

This question is covered here in great detail.

How do you measure the memory usage of an application or process in Linux?

From the blog article of Understanding memory usage on Linux , ps is not an accurate tool to use for this intent.

Why ps is "wrong"

Depending on how you look at it, ps is not reporting the real memory usage of processes. What it is really doing is showing how much real memory each process would take up if it were the only process running . Of course, a typical Linux machine has several dozen processes running at any given time, which means that the VSZ and RSS numbers reported by ps are almost definitely wrong .

Answer 11

This question is covered here in great detail.

How do you measure the memory usage of an application or process in Linux?

From the blog article of Understanding memory usage on Linux , ps is not an accurate tool to use for this intent.

Why ps is "wrong"

Depending on how you look at it, ps is not reporting the real memory usage of processes. What it is really doing is showing how much real memory each process would take up if it were the only process running . Of course, a typical Linux machine has several dozen processes running at any given time, which means that the VSZ and RSS numbers reported by ps are almost definitely wrong .

Answer 12

This question is covered here in great detail.

How do you measure the memory usage of an application or process in Linux?

From the blog article of Understanding memory usage on Linux , ps is not an accurate tool to use for this intent.

Why ps is "wrong"

Depending on how you look at it, ps is not reporting the real memory usage of processes. What it is really doing is showing how much real memory each process would take up if it were the only process running . Of course, a typical Linux machine has several dozen processes running at any given time, which means that the VSZ and RSS numbers reported by ps are almost definitely wrong .

Answer 13

This question is covered here in great detail.

How do you measure the memory usage of an application or process in Linux?

From the blog article of Understanding memory usage on Linux , ps is not an accurate tool to use for this intent.

Why ps is "wrong"

Depending on how you look at it, ps is not reporting the real memory usage of processes. What it is really doing is showing how much real memory each process would take up if it were the only process running . Of course, a typical Linux machine has several dozen processes running at any given time, which means that the VSZ and RSS numbers reported by ps are almost definitely wrong .

Answer 14

This question is covered here in great detail.

How do you measure the memory usage of an application or process in Linux?

From the blog article of Understanding memory usage on Linux , ps is not an accurate tool to use for this intent.

Why ps is "wrong"

Depending on how you look at it, ps is not reporting the real memory usage of processes. What it is really doing is showing how much real memory each process would take up if it were the only process running . Of course, a typical Linux machine has several dozen processes running at any given time, which means that the VSZ and RSS numbers reported by ps are almost definitely wrong .

Answer 15

This question is covered here in great detail.

How do you measure the memory usage of an application or process in Linux?

From the blog article of Understanding memory usage on Linux , ps is not an accurate tool to use for this intent.

Why ps is "wrong"

Depending on how you look at it, ps is not reporting the real memory usage of processes. What it is really doing is showing how much real memory each process would take up if it were the only process running . Of course, a typical Linux machine has several dozen processes running at any given time, which means that the VSZ and RSS numbers reported by ps are almost definitely wrong .

Answer 16

Valgrind is amazing if you have the time to run it. valgrind --tool=massif is The Right Solution.

However, I'm starting to run larger examples, and using valgrind is no longer practical. Is there a way to tell the maximum memory usage (modulo page size and shared pages) of a program?

On a real unix system, /usr/bin/time -v works. On Linux, however, this does not work.

Answer 17

This question is covered here in great detail.

How do you measure the memory usage of an application or process in Linux?

From the blog article of Understanding memory usage on Linux , ps is not an accurate tool to use for this intent.

Why ps is "wrong"

Depending on how you look at it, ps is not reporting the real memory usage of processes. What it is really doing is showing how much real memory each process would take up if it were the only process running . Of course, a typical Linux machine has several dozen processes running at any given time, which means that the VSZ and RSS numbers reported by ps are almost definitely wrong .

Answer 18

This question is covered here in great detail.

How do you measure the memory usage of an application or process in Linux?

From the blog article of Understanding memory usage on Linux , ps is not an accurate tool to use for this intent.

Why ps is "wrong"

Depending on how you look at it, ps is not reporting the real memory usage of processes. What it is really doing is showing how much real memory each process would take up if it were the only process running . Of course, a typical Linux machine has several dozen processes running at any given time, which means that the VSZ and RSS numbers reported by ps are almost definitely wrong .

Answer 19

This question is covered here in great detail.

How do you measure the memory usage of an application or process in Linux?

From the blog article of Understanding memory usage on Linux , ps is not an accurate tool to use for this intent.

Why ps is "wrong"

Depending on how you look at it, ps is not reporting the real memory usage of processes. What it is really doing is showing how much real memory each process would take up if it were the only process running . Of course, a typical Linux machine has several dozen processes running at any given time, which means that the VSZ and RSS numbers reported by ps are almost definitely wrong .

Answer 20

This question is covered here in great detail.

How do you measure the memory usage of an application or process in Linux?

From the blog article of Understanding memory usage on Linux , ps is not an accurate tool to use for this intent.

Why ps is "wrong"

Depending on how you look at it, ps is not reporting the real memory usage of processes. What it is really doing is showing how much real memory each process would take up if it were the only process running . Of course, a typical Linux machine has several dozen processes running at any given time, which means that the VSZ and RSS numbers reported by ps are almost definitely wrong .

Answer 21

This question is covered here in great detail.

How do you measure the memory usage of an application or process in Linux?

From the blog article of Understanding memory usage on Linux , ps is not an accurate tool to use for this intent.

Why ps is "wrong"

Depending on how you look at it, ps is not reporting the real memory usage of processes. What it is really doing is showing how much real memory each process would take up if it were the only process running . Of course, a typical Linux machine has several dozen processes running at any given time, which means that the VSZ and RSS numbers reported by ps are almost definitely wrong .

Answer 22

This question is covered here in great detail.

How do you measure the memory usage of an application or process in Linux?

From the blog article of Understanding memory usage on Linux , ps is not an accurate tool to use for this intent.

Why ps is "wrong"

Depending on how you look at it, ps is not reporting the real memory usage of processes. What it is really doing is showing how much real memory each process would take up if it were the only process running . Of course, a typical Linux machine has several dozen processes running at any given time, which means that the VSZ and RSS numbers reported by ps are almost definitely wrong .

Answer 23

This question is covered here in great detail.

How do you measure the memory usage of an application or process in Linux?

From the blog article of Understanding memory usage on Linux , ps is not an accurate tool to use for this intent.

Why ps is "wrong"

Depending on how you look at it, ps is not reporting the real memory usage of processes. What it is really doing is showing how much real memory each process would take up if it were the only process running . Of course, a typical Linux machine has several dozen processes running at any given time, which means that the VSZ and RSS numbers reported by ps are almost definitely wrong .

Answer 24

This question is covered here in great detail.

How do you measure the memory usage of an application or process in Linux?

From the blog article of Understanding memory usage on Linux , ps is not an accurate tool to use for this intent.

Why ps is "wrong"

Depending on how you look at it, ps is not reporting the real memory usage of processes. What it is really doing is showing how much real memory each process would take up if it were the only process running . Of course, a typical Linux machine has several dozen processes running at any given time, which means that the VSZ and RSS numbers reported by ps are almost definitely wrong .

Answer 25

This question is covered here in great detail.

How do you measure the memory usage of an application or process in Linux?

From the blog article of Understanding memory usage on Linux , ps is not an accurate tool to use for this intent.

Why ps is "wrong"

Depending on how you look at it, ps is not reporting the real memory usage of processes. What it is really doing is showing how much real memory each process would take up if it were the only process running . Of course, a typical Linux machine has several dozen processes running at any given time, which means that the VSZ and RSS numbers reported by ps are almost definitely wrong .

Answer 26

This question is covered here in great detail.

How do you measure the memory usage of an application or process in Linux?

From the blog article of Understanding memory usage on Linux , ps is not an accurate tool to use for this intent.

Why ps is "wrong"

Depending on how you look at it, ps is not reporting the real memory usage of processes. What it is really doing is showing how much real memory each process would take up if it were the only process running . Of course, a typical Linux machine has several dozen processes running at any given time, which means that the VSZ and RSS numbers reported by ps are almost definitely wrong .

Answer 27

This question is covered here in great detail.

How do you measure the memory usage of an application or process in Linux?

From the blog article of Understanding memory usage on Linux , ps is not an accurate tool to use for this intent.

Why ps is "wrong"

Depending on how you look at it, ps is not reporting the real memory usage of processes. What it is really doing is showing how much real memory each process would take up if it were the only process running . Of course, a typical Linux machine has several dozen processes running at any given time, which means that the VSZ and RSS numbers reported by ps are almost definitely wrong .

Answer 28

This question is covered here in great detail.

How do you measure the memory usage of an application or process in Linux?

From the blog article of Understanding memory usage on Linux , ps is not an accurate tool to use for this intent.

Why ps is "wrong"

Depending on how you look at it, ps is not reporting the real memory usage of processes. What it is really doing is showing how much real memory each process would take up if it were the only process running . Of course, a typical Linux machine has several dozen processes running at any given time, which means that the VSZ and RSS numbers reported by ps are almost definitely wrong .

Answer 29

Given some of the answers (thanks thomasrutter), to get the actual swap and RAM for a single application, I came up with the following, say we want to know what 'firefox' is using

sudo smem | awk '/firefox/{swap += $5; pss += $7;} END {print "swap = "swap/1024" PSS = "pss/1024}'

Or for libvirt;

sudo smem | awk '/libvirt/{swap += $5; pss += $7;} END {print "swap = "swap/1024" PSS = "pss/1024}'

This will give you the total in MB like so;

swap = 0 PSS = 2096.92

swap = 224.75 PSS = 421.455

Tested on ubuntu 16.04 through 20.04.

Answer 30

This question is covered here in great detail.

How do you measure the memory usage of an application or process in Linux?

From the blog article of Understanding memory usage on Linux , ps is not an accurate tool to use for this intent.

Why ps is "wrong"

Depending on how you look at it, ps is not reporting the real memory usage of processes. What it is really doing is showing how much real memory each process would take up if it were the only process running . Of course, a typical Linux machine has several dozen processes running at any given time, which means that the VSZ and RSS numbers reported by ps are almost definitely wrong .

Answer 31

使用ubuntu中提供的内置“ 系统监视器 ” GUI工具

Answer 32

This question is covered here in great detail.

How do you measure the memory usage of an application or process in Linux?

From the blog article of Understanding memory usage on Linux , ps is not an accurate tool to use for this intent.

Why ps is "wrong"

Depending on how you look at it, ps is not reporting the real memory usage of processes. What it is really doing is showing how much real memory each process would take up if it were the only process running . Of course, a typical Linux machine has several dozen processes running at any given time, which means that the VSZ and RSS numbers reported by ps are almost definitely wrong .

Answer 33

This question is covered here in great detail.

How do you measure the memory usage of an application or process in Linux?

From the blog article of Understanding memory usage on Linux , ps is not an accurate tool to use for this intent.

Why ps is "wrong"

Depending on how you look at it, ps is not reporting the real memory usage of processes. What it is really doing is showing how much real memory each process would take up if it were the only process running . Of course, a typical Linux machine has several dozen processes running at any given time, which means that the VSZ and RSS numbers reported by ps are almost definitely wrong .