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ps_mem – A Simple Python Script To Report Core Memory Usage Accurately In Linux
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============================================================
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[ps_mem][2] is a simple python script which help us to get core memory usage accurately for a program in Linux. There are many utilities available in Linux to see memory usage such as free, vmstat, smem & top, etc,. but this utility bit different compare with others since its showing core memory usage accurately.
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It’s calculating the sum of private & sum of shared memory against a program and giving total used RAM in more appropriate way, definitely it will help everyone to understand which program eating more RAM in system.
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You can install the ps_mem utility in many ways, through package manager, pip and directly method (by running the ps_mem.py script). Make a note, it’s requires root privilege.
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Also read the below suggested memory utilities.
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Suggested Read : [free – A Standard Command to Check Memory Usage Statistics (Free & Used) in Linux][3]
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Suggested Read : [smem – Linux Memory Reporting/Statistics Tool][4]
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Suggested Read : [vmstat – A Standard Nifty Tool to Report Virtual Memory Statistics][5]
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#### Install ps_mem Via Package Manager
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RHEL based system has the ps_mem utility in default repository, so we can easily install it through package manager.
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For RHEL/CentOS, use [yum Package Manager][6] to install ps_mem package.
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```
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$ sudo yum install ps_mem
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```
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For Fedora, use [dnf Package Manager][7] to install ps_mem package.
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```
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$ sudo dnf install ps_mem
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```
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For Arch Linux, use [pacman Package Manager][8] to install ps_mem package.
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```
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$ sudo pacman -S ps_mem
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```
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#### Install ps_mem Via Pip
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pip is a recommended tool for installing Python packages in Linux. Use pip command instead of package manager to get latest build. Make sure you should have install pip package on your system in order to use the pip package. If no, use distribution package manager and install `python-pip` package.
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For Debian based systems.
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```
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$ sudo apt-get install python-pip
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```
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For RHEL/CentOS based systems.
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```
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$ sudo yum install python-pip
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```
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For Fedora
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```
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$ sudo dnf install python-pip
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```
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For openSUSE
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```
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$ sudo zypper install python-pip
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```
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For Arch Linux based systems
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```
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$ sudo pacman -S python-pip
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```
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Finally run the pip tool to install ps_mem on Linux.
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```
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$ sudo pip install ps_mem
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```
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#### Run ps_mem.py script directly
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Alternatively we can run the `ps_mem.ph` script directly by downloading the file from developer github page.
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```
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$ git clone https://github.com/pixelb/ps_mem.git && cd ps_mem
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$ sudo python ps_mem.py
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```
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#### ps_mem Usage
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Just run the `ps_mem` without any option to get core memory usage accurately for per program.
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```
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$ sudo ps_mem
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Private + Shared = RAM used Program
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1.6 MiB + 438.5 KiB = 2.1 MiB packagekitd
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1.7 MiB + 498.0 KiB = 2.1 MiB indicator-application-service
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912.0 KiB + 1.3 MiB = 2.2 MiB window-stack-bridge
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2.0 MiB + 350.5 KiB = 2.3 MiB gnome-keyring-daemon
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1.8 MiB + 575.0 KiB = 2.3 MiB whoopsie
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2.4 MiB + 304.5 KiB = 2.7 MiB systemd-journald
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2.7 MiB + 157.5 KiB = 2.8 MiB ibus-engine-simple
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2.7 MiB + 182.0 KiB = 2.9 MiB ibus-dconf
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2.7 MiB + 332.5 KiB = 3.0 MiB NetworkManager
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3.1 MiB + 169.5 KiB = 3.2 MiB polkitd
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1.9 MiB + 1.7 MiB = 3.6 MiB systemd (2)
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3.4 MiB + 172.5 KiB = 3.6 MiB deja-dup-monitor
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2.9 MiB + 685.0 KiB = 3.6 MiB zeitgeist-datahub
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2.9 MiB + 848.0 KiB = 3.7 MiB python2.7
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3.5 MiB + 442.0 KiB = 4.0 MiB dbus-daemon (3)
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3.2 MiB + 951.0 KiB = 4.1 MiB evolution-addressbook-factory
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3.9 MiB + 435.0 KiB = 4.3 MiB lightdm (2)
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3.7 MiB + 826.5 KiB = 4.5 MiB polkit-gnome-authentication-agent-1
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3.7 MiB + 853.0 KiB = 4.6 MiB unity-fallback-mount-helper
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3.7 MiB + 884.0 KiB = 4.6 MiB ibus-x11
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4.1 MiB + 590.5 KiB = 4.6 MiB indicator-sound-service
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4.5 MiB + 167.0 KiB = 4.7 MiB udisksd
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4.3 MiB + 571.0 KiB = 4.9 MiB gnome-session-binary
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4.5 MiB + 519.0 KiB = 5.0 MiB zeitgeist-fts
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4.2 MiB + 900.5 KiB = 5.1 MiB indicator-printers-service
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4.1 MiB + 1.0 MiB = 5.1 MiB bash (2)
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3.9 MiB + 1.2 MiB = 5.2 MiB update-notifier
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4.8 MiB + 426.0 KiB = 5.2 MiB pulseaudio
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4.5 MiB + 1.5 MiB = 6.0 MiB url-dispatcher
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4.3 MiB + 1.7 MiB = 6.0 MiB python3.5
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5.2 MiB + 856.5 KiB = 6.1 MiB evolution-addressbook-factory-subprocess
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5.6 MiB + 494.5 KiB = 6.1 MiB colord
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5.0 MiB + 1.2 MiB = 6.2 MiB bamfdaemon
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5.7 MiB + 1.1 MiB = 6.8 MiB evolution-source-registry
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5.6 MiB + 1.3 MiB = 6.9 MiB indicator-keyboard-service
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5.5 MiB + 1.5 MiB = 7.1 MiB ibus-ui-gtk3
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5.4 MiB + 1.8 MiB = 7.2 MiB notify-osd
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6.3 MiB + 1.1 MiB = 7.4 MiB nm-applet
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6.4 MiB + 1.4 MiB = 7.8 MiB evolution-calendar-factory
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6.3 MiB + 1.5 MiB = 7.8 MiB hud-service
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6.5 MiB + 1.5 MiB = 8.0 MiB unity-panel-service
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8.2 MiB + 1.8 MiB = 10.0 MiB unity-settings-daemon
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11.1 MiB + 126.5 KiB = 11.2 MiB snapd
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8.2 MiB + 3.0 MiB = 11.2 MiB indicator-datetime-service
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10.3 MiB + 1.7 MiB = 12.0 MiB evolution-calendar-factory-subprocess (2)
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12.5 MiB + 2.8 MiB = 15.3 MiB redshift-gtk
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14.5 MiB + 1.8 MiB = 16.3 MiB fluxgui
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13.5 MiB + 2.9 MiB = 16.4 MiB gnome-terminal-server
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12.7 MiB + 7.6 MiB = 20.4 MiB apache2 (6)
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20.8 MiB + 503.0 KiB = 21.3 MiB fwupd
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22.8 MiB + 70.0 KiB = 22.9 MiB collectl
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22.2 MiB + 10.8 MiB = 33.0 MiB nautilus
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70.9 MiB + 1.5 MiB = 72.4 MiB gnome-software
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97.9 MiB + 24.8 MiB = 122.8 MiB Xorg
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131.9 MiB + 168.0 KiB = 132.1 MiB mysqld
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222.1 MiB + 9.4 MiB = 231.5 MiB compiz
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286.2 MiB + 11.8 MiB = 298.0 MiB firefox
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---------------------------------
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1.3 GiB
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=================================
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```
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To print an output with full path.
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```
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$ sudo ps_mem -s
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Private + Shared = RAM used Program
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3.2 MiB + 951.0 KiB = 4.1 MiB /usr/lib/evolution/evolution-addressbook-factory
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3.7 MiB + 826.5 KiB = 4.5 MiB /usr/lib/policykit-1-gnome/polkit-gnome-authentication-agent-1
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3.7 MiB + 853.0 KiB = 4.6 MiB /usr/lib/unity-settings-daemon/unity-fallback-mount-helper
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3.7 MiB + 884.0 KiB = 4.6 MiB /usr/lib/ibus/ibus-x11 --kill-daemon
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4.1 MiB + 590.5 KiB = 4.6 MiB /usr/lib/x86_64-linux-gnu/indicator-sound/indicator-sound-service
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4.5 MiB + 167.0 KiB = 4.7 MiB /usr/lib/udisks2/udisksd --no-debug
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4.3 MiB + 571.0 KiB = 4.9 MiB /usr/lib/gnome-session/gnome-session-binary --session=ubuntu
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4.5 MiB + 519.0 KiB = 5.0 MiB /usr/lib/x86_64-linux-gnu/zeitgeist-fts
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4.2 MiB + 900.5 KiB = 5.1 MiB /usr/lib/x86_64-linux-gnu/indicator-printers/indicator-printers-service
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4.1 MiB + 1.0 MiB = 5.1 MiB bash (2)
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3.9 MiB + 1.2 MiB = 5.2 MiB update-notifier
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4.8 MiB + 426.0 KiB = 5.2 MiB /usr/bin/pulseaudio --start --log-target=syslog
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5.0 MiB + 863.0 KiB = 5.9 MiB /usr/lib/evolution/evolution-calendar-factory-subprocess --factory local --bus-name org.gnome.evolution.dataserver.Subprocess.Backend.Calendarx2573x3 --own-path /org/gnome/evolution/dataserver/Subprocess/Backend/Calendar/2573/3
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4.5 MiB + 1.5 MiB = 6.0 MiB /usr/lib/x86_64-linux-gnu/url-dispatcher/url-dispatcher
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4.3 MiB + 1.7 MiB = 6.0 MiB python3 -v
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5.2 MiB + 856.5 KiB = 6.1 MiB /usr/lib/evolution/evolution-addressbook-factory-subprocess --factory local --bus-name org.gnome.evolution.dataserver.Subprocess.Backend.AddressBookx2637x2 --own-path /org/gnome/evolution/dataserver/Subprocess/Backend/AddressBook/2637/2
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5.6 MiB + 494.5 KiB = 6.1 MiB /usr/lib/colord/colord
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5.2 MiB + 913.0 KiB = 6.1 MiB /usr/lib/evolution/evolution-calendar-factory-subprocess --factory contacts --bus-name org.gnome.evolution.dataserver.Subprocess.Backend.Calendarx2573x2 --own-path /org/gnome/evolution/dataserver/Subprocess/Backend/Calendar/2573/2
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5.0 MiB + 1.2 MiB = 6.2 MiB /usr/lib/x86_64-linux-gnu/bamf/bamfdaemon
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5.7 MiB + 1.1 MiB = 6.8 MiB /usr/lib/evolution/evolution-source-registry
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5.6 MiB + 1.3 MiB = 6.9 MiB /usr/lib/x86_64-linux-gnu/indicator-keyboard/indicator-keyboard-service --use-gtk
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5.5 MiB + 1.5 MiB = 7.1 MiB /usr/lib/ibus/ibus-ui-gtk3
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5.4 MiB + 1.8 MiB = 7.2 MiB /usr/lib/x86_64-linux-gnu/notify-osd
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6.3 MiB + 1.1 MiB = 7.4 MiB nm-applet
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6.4 MiB + 1.4 MiB = 7.8 MiB /usr/lib/evolution/evolution-calendar-factory
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6.3 MiB + 1.5 MiB = 7.8 MiB /usr/lib/x86_64-linux-gnu/hud/hud-service
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6.5 MiB + 1.5 MiB = 8.0 MiB /usr/lib/x86_64-linux-gnu/unity/unity-panel-service
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8.2 MiB + 1.8 MiB = 10.0 MiB /usr/lib/unity-settings-daemon/unity-settings-daemon
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11.1 MiB + 126.5 KiB = 11.2 MiB /usr/lib/snapd/snapd
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8.2 MiB + 3.0 MiB = 11.2 MiB /usr/lib/x86_64-linux-gnu/indicator-datetime/indicator-datetime-service
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12.5 MiB + 2.8 MiB = 15.3 MiB /usr/bin/python3 /usr/bin/redshift-gtk
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14.5 MiB + 1.8 MiB = 16.3 MiB /usr/bin/python /usr/bin/fluxgui
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13.6 MiB + 2.9 MiB = 16.4 MiB /usr/lib/gnome-terminal/gnome-terminal-server
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12.7 MiB + 7.6 MiB = 20.4 MiB /usr/sbin/apache2 -k start (6)
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20.8 MiB + 503.0 KiB = 21.3 MiB /usr/lib/x86_64-linux-gnu/fwupd/fwupd
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22.8 MiB + 70.0 KiB = 22.9 MiB /usr/bin/perl -w /usr/bin/collectl -D
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22.2 MiB + 10.8 MiB = 33.0 MiB nautilus -n
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70.9 MiB + 1.5 MiB = 72.4 MiB /usr/bin/gnome-software --gapplication-service
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97.9 MiB + 24.8 MiB = 122.8 MiB /usr/lib/xorg/Xorg -core :0 -seat seat0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
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131.9 MiB + 168.0 KiB = 132.1 MiB /usr/sbin/mysqld
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222.1 MiB + 9.4 MiB = 231.5 MiB /usr/bin/compiz
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286.2 MiB + 11.8 MiB = 298.1 MiB /usr/lib/firefox/firefox
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---------------------------------
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1.3 GiB
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=================================
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```
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Only show memory usage PIDs in the specified list
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```
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$ sudo ps_mem -p 2886,4386
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Private + Shared = RAM used Program
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13.5 MiB + 2.9 MiB = 16.4 MiB gnome-terminal-server
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286.2 MiB + 11.8 MiB = 298.0 MiB firefox
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---------------------------------
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314.4 MiB
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=================================
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```
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To print process memory in every N seconds. The following command reports memory usage in every 2 seconds.
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```
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$ sudo ps_mem w 2
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```
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To show only total memory.
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```
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$ sudo ps_mem -t
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1329884160
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```
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--------------------------------------------------------------------------------
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via: http://www.2daygeek.com/ps_mem-report-core-memory-usage-accurately-in-linux/
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作者：[ 2DAYGEEK ][a]
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]:http://www.2daygeek.com/author/2daygeek/
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[1]:http://www.2daygeek.com/author/2daygeek/
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[2]:https://github.com/pixelb/ps_mem
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[3]:http://www.2daygeek.com/free-command-to-check-memory-usage-statistics-in-linux/
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[4]:http://www.2daygeek.com/smem-linux-memory-usage-statistics-reporting-tool/
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[5]:http://www.2daygeek.com/linux-vmstat-command-examples-tool-report-virtual-memory-statistics/
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[6]:http://www.2daygeek.com/yum-command-examples/
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[7]:http://www.2daygeek.com/dnf-command-examples/
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[8]:http://www.2daygeek.com/pacman-command-examples/
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