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16+NUL was clearly too short for descriptive names, pushed it
all up to get closer to the common 256 fs limit.
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Currently only vmon wires this up to --name, but vwm could get
the window title of the window being overlayed and pass that in
if set...
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Shows in the window title and the start of snapshot filenames
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This implements saving the chart contents to a PNG file created
in the output dir upon receiving SIGCHLD.
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Preparatory commit; saved PNGs need a place to go, and the user
needs a way to control that. Defaults to CWD (".")
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Preparatory commit; PNG snapshots will be named using the start time
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This makes vmon exit more cooperatively when window managers kindly
ask it to with a message rather than requiring XKillClient().
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vmon introduces a non-overlay usage, monitors is correct but ambiguous,
graphs is also amiguous, charts is short and distinctive.
renaming of the files comes in a separate, future commit.
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In the course of applying the new style over the rest of the code I
decided it's obnoxiouos and prefer the old way of indenting the cases
one level from the switch. I know it wastes horizontal space and can
see the value of flattening the cases with the switch, but once you
start having variables at the start of the switch body, and blocked
cases, it just starts becoming quite unattractive without the indentation.
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I think I've developed a force of habit typing `static inline` after
the ray tracer in rototiller.
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vmon exposes the monitoring overlays of vwm through a standalone
commandline utility by creating dedicated window for presenting the
overlay.
At this time a single preexisting PID may be specified, forming the root of
a recursively monitored heirarchy. Alternatively, a command may specified
which vmon will then fork and execute on your behalf, automatically
monitoring the child and its descendants for you, in a style similar to
strace.
Examples:
Monitor a linux kernel build in fullscreen mode, note the --:
`vmon --fullscreen -- make -C /usr/src/linux -j8`
Monitor the entire system:
`vmon --fullscreen --pid 1`
For convenience, omitting --pid and a command to run assumes PID 1:
`vmon --fullscreen` is analogous to `vmon --fullscreen --pid 1`
Monitor a linux kernel build fullscreen at 50Hz:
`vmon --fullscreen --hertz 50 -- make -C /usr/src/linux -j8`
Do the same thing but don't exit when the make completes:
`vmon --linger --fullscreen --hertz 50 -- make -C /usr/src/linux -j8`
Help is provided via `vmon --help`, where you'll find all flags described
with their short and long forms.
Some important TODO items include:
- Support for specifying multiple top-level processes
- Support for mixing --pid and running a command
(useful for watching specific system processes while you're running
something specific)
- Support for scrolling within the window. The overlays in general need
to evolve a bit to better support the vmon use case. In vwm there
wasn't any intention of accomodating the entire space if it exceeded
what was naturally available in the existing window's dimensions.
That makes sense for vwm, but vmon not so much.
You can achieve the same thing more or less by resizing the window to be
larger than the screen (easy to do in vwm using a combination of
Mod1-Right-Click to resize, then Mod1-Left-Click to drag the window,
repeatedly. Then just Mod1-Left-Click to grab the window and "scroll"
it by moving the desired part on-screen, repeatedly. Cumbersome, but
works fine in a pinch. Not all window managers can do this though...
Of course it would be less costly to only render what's visible, like a
scrollable window would achieve. This is probably the top priority
TODO.
- Support for monitoring of memory use, files, per-process IO activity.
libvmon supports substantially more than is being visualized currently.
- Support for changing the font.
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