Monitor metrics in a real-time time-series line-graph
- Real-time time-series graph of metrics.
- Provide your own metric command.
- Several built-in metrics.
- Polished graph interface.
- Adjustable refresh rate.
- Pausable updates.
- Hide/show lines.
- Clickable/hoverable lines.
- Remembers window position/layout.
pip install grafmon
usage: grafmon [-h] [-m MONITOR | -c COMMAND] [-r REFRESHRATE] [-t MAXTICKS]
[-l MAXLABELS] [--list-monitors]
Monitor metrics in a real-time time-series graph
options:
-h, --help show this help message and exit
-m MONITOR, --monitor MONITOR
Select from builtin monitors to feed data into monitor
[default: pcpu]
-c COMMAND, --command COMMAND
User command to feed data into monitor [example: ps
-eo rss,pid,comm --no-headers]
-r REFRESHRATE, --refreshrate REFRESHRATE
Refresh rate in milliseconds [default: 1000]
-t TICKS, --ticks TICKS
Count of ticks on X axis [default: 60]
-l LABELS, --labels LABELS
Count of labels on X axis [default: 10]
--list-monitors List available builtin monitors
avgpcpu Average CPU% (using `ps`) over lifetime of all processes
cuc CPU%, including dead children, in extended ##.### format of all processes
cuu CPU% in extended ##.### format of all processes
drs Data resident set size of all processes
pcpu Immediate CPU% (using `top`) of all processes
pmem Physical memory percentage of all processes
pss Proportional share size of all processes
rbytes Number of bytes really fetched from storage layer of all processes
rchars Number of bytes read from storage of all processes
rops Number of read I/O operations of all processes
rss Resident set size (physical memory usage, in kilobytes) of all processes
sz Physical pages used of all processes
thcount Thread counts of all processes
trs Text resident set (executable code memory usage) of all processes
vsz Virtual memory usage of all processes
wbytes Number of bytes really written to storage layer of all processes
wcbytes Number of canceled write bytes of all processes
wchars Number of bytes written to storage of all processes
wops Number of write I/O operations of all processes
Grafmon is not limited to the builtin monitors. Grafmon also accepts user-provided commands for monitoring. Grafmon can monitor smart plug metrics to track power usage of appliances. Grafmon can monitor IoT sensors and more!
The command must output lines in the format of <float> <string> to STDIN. The <float>
will be the value associated with <string>. The <string> may contain spaces. Grafmon will
invoke the command every refresh-rate tick. It may be necessary to write a small wrapper script
to convert the data to the correct formatting.
Examples:
grafmon -c 'ps -eo pcpu,pid,comm --no-headers'
grafmon -c 'cat somefile_that_gets_overwritten'
grafmon -c 'socat TCP-LISTEN:13510 -'
I needed an easy-to-install app that can graph in real-time various system metrics, notably percentages of CPU usages for all active processes. The KDE and Gnome system monitors/task managers graphed overall CPU usage rather than per-process usage.
Grafmon is inspired in part by Windows' perfmon.exe. The graph does not scroll, but instead updates in a "wipe". A vertical line will move from left-to-right as the metrics are read each tick. When the line reaches the end, it resets back to the beginning. This allows easy hovering over of graph elements to inspect the data. A moving scrolling graph would be more difficult to hover over the lines and their peaks.
Lines may be clicked on to highlight them to more easily see them in the graph. Lines may be hovered-over to see a tooltip of their values. Their values will also appear in the status bar at the bottom of the window.
To zoom the graph in to inspect lower valued lines, you can untick the checkboxes in the list on the left. Unticking checkboxes for lines with the highest peaks will hide the lines and the graph will zoom in to fit the next highest peaks.