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Just annotations of little "how to's", so I know I can find how to do something I've already done when I need to do it again, in case I don't remember anymore, which is not unlikely. Hopefully they can be useful to others, but I can't guarantee that it will work, or that it won't even make things worse.

A few tools to manage the CPU load of processes

Posted 10-12-2016 at 12:11 PM by the dsc (linux-related notes)

Sometimes I see questions related with that floating around, so here's a quick and lazy (just copying defitions from the manuals or sites of these programs) post on which hopefully someone in need of such tools will stumble as well.

"ionice - get/set program io scheduling class and priority"

"The auto nice daemon activates itself in certain intervals and renices jobs according to their priority and CPU usage. Jobs owned by root are left alone. Jobs are...
Posted in Uncategorized
Views 101 Comments 0 the dsc is offline

KDE/QT dialogs in GTK/Gnome, or, "that's a good question".

Posted 10-11-2016 at 04:20 AM by the dsc (linux-related notes)
Updated 10-11-2016 at 04:22 AM by the dsc

October 12, 2008 at 17:09
Well now Qt uses GTK dialogs in GNOME. Why can’t Gtk “repay the debt” and use KDE dialogs in KDE?
I didn't even know that KDE did that/allowed to do that (alongside with GTK2 theming, which again, doesn't work in the other direction).

How nice would it be if it was reciprocal.

I simply don't understand some UI developers philosophies. Like "lets...
Posted in Uncategorized
Views 67 Comments 0 the dsc is offline

Silent pulse audio output detection/indication, with bash + arecord

Posted 10-02-2016 at 03:16 AM by the dsc (linux-related notes)
Updated 10-02-2016 at 03:19 AM by the dsc

You can "grep" something at /proc or whatever that tells whether there's some sound theoretically being played, but it will give a false positive when "silent sound" is being played.

A clumsy hack along these lines can detect "silent audio" as silence:

while true ; do 
arecord -d 1 -D pulse > /dev/shm/test-audio 2>&1 
cut -c 300- /dev/shm/test-audio | grep -a [[:alpha:]] > /dev/null && echo sound
Posted in Uncategorized
Views 80 Comments 0 the dsc is offline

Bash xdotool+wmctrl "daemon" that maximizes "almost maximized" windows

Posted 10-01-2016 at 07:16 PM by the dsc (linux-related notes)
Tags openbox, wmctrl

I find annoying that, for whatever reason, it seems that some windows get "almost maximized" (I have the impression that some browsers do that by "design", even though I'm not sure), and then I end up clicking in a desktop pixel instead of the scroll bar or something. In my case that action is assigned to show the desktop/minimize all windows.

So here's what I just came up with so far, for a 1280x1024 resolution:

while true ; do sleep 3
Posted in Uncategorized
Views 89 Comments 0 the dsc is offline

Script to watch potentially misbehaving processes and kill them if needed

Posted 09-30-2016 at 10:09 AM by the dsc (linux-related notes)
Updated 10-02-2016 at 02:04 PM by the dsc (small improvements / bug fixes)
Tags cpu, hang, kill

A second adaptation of an adaptation of this script:

The original adaptation was supposed to put any misbehaving process under cpulimit leashes, I'm not sure it's working properly. I've made a more radical implementation intended for programs that are more likely to misbehave and probably hang with high cpu, when killing them after a while seems to be a good idea.

I think...
Posted in Uncategorized
Views 83 Comments 0 the dsc is offline


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