#proc #linux #process #monitor

app procmon-oprs

A process monitor for Linux

4 releases

✓ Uses Rust 2018 edition

new 0.3.5 May 24, 2020
0.3.2 May 22, 2020
0.3.1 May 21, 2020
0.3.0 May 20, 2020

#65 in Unix APIs





Oprs is a process monitor for Linux. The name is an abbreviation for Observe Process ReSources.

It's based on procfs.


  • Monitor memory, execution time, input/output, page fault.
  • Optional minimum and maximum.
  • Select processes by PID, PID file or name.
  • Display in plain text or a terminal UI.

Basic usage

To get the memory size, elapsed time and page fault of a process by PID (firefox), a process by pid file (lvmetad) and a process by name (bash), run:

oprs --human -p 786 -f pulseaudio.pid -n dhclient -m mem:vm mem:rss+max time:elapsed fault:major


Without argument, the command prints the available metrics.

By default, the raw figure is printed unless -raw is added: mem:rss-raw+min+max.

CPU usage

Unlike other tools, the CPU usage of a process displayed by time:cpu+ratio is the percentage of the total CPU time. A process using all cores of a 4-cores system would be at 100%, not 400%.

The CPU usage is (stime + utime) / ((user - guest) + (nice - guest_nice) + system + idle + iowait + irq + softirq) where stime and utime comes from /proc/PID/stat and user, … from /proc/stat.


Copyright (c) 2020 Laurent Pelecq

oprs is distributed under the terms of the GNU General Public License version 3.

See the LICENSE GPL3 for details.


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