When comparing Glances vs GKrellM, the Slant community recommends Glances for most people. In the question“What are the best system monitors for UNIX-like systems?” Glances is ranked 2nd while GKrellM is ranked 12th. The most important reason people chose Glances is:
Unlike the default system monitors found in Ubuntu or Gnome Shell, Glances shows a lot of information all in one place instead of having to click through tab after tab. This makes cursory glances at one's stats a lot easier and less time-consuming.
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Pros
Pro Important information all in one place
Unlike the default system monitors found in Ubuntu or Gnome Shell, Glances shows a lot of information all in one place instead of having to click through tab after tab. This makes cursory glances at one's stats a lot easier and less time-consuming.
Pro Includes network bandwidth
Pro Works in a terminal
Works perfectly well even if you remote access a server via SSH.
Pro A lot of information
Much more information than htop.
Pro Easily installed
Glances is a popular system monitor and in being so is often found in most distros repositories, so it is easily installed.
Pro Web interface and remote monitoring features
A Web interface based on a Restful JSON API is also available and allows remote monitoring.
Pro Shows only necessary details
Most performance monitors overwhelm you with too much detail. Glances almost always shows exactly what you were interested in immediately.
Pro Customize what to monitor
Users can easily set GKrellM to monitor what they like (depending on what monitors are supported by their PC) such as CPU usage (which can be set to monitor each core individually), as well as temperatures and fan speeds.
Pro Many available plugins
The uses of the monitor can be expanded with available plugins ranging from weather information to TIVO information.
Pro Set up alerts
Through the settings one can set alarms and warning for each monitor, which allows one to always stay informed if anything is getting above what their set limits are.
Cons
Con Lack of colors can make it confusing.
Con High cpu usage (on RPi), broken after a few hours of running
It's based on Python.
Con Default theme is not that great looking
The theme that comes by default for GKrellM is not really appealing to the eye and sadly many of the available themes are not that much better with fuzzy text and bad color choices.