✓ Uses Rust 2018 edition
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#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.
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.
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.