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Killing backticks when bouncing screen.
From: |
Chris Jones |
Subject: |
Killing backticks when bouncing screen. |
Date: |
Mon, 19 Jan 2009 21:20:55 -0500 |
User-agent: |
Mutt/1.5.13 (2006-08-11) |
I have written a few scripts that display monitoring counters on the
hardstatus line.
Thinking I would avoid the overhead of starting new processes,
particularly for stuff that requires frequent updates in order to be
relevant .. such as CPU utilization, I thought I'd write scripts that
run in the background & iterate for ever over the following: acquire
data, format & write to stdout, sleep a while, etc.
The corresponding backtick commands in my .screenrc specify values of
zero for "lifespan" & "autorefresh" - as documented on the screen man
page:
"If both the lifespan and the autorefresh parameters are zero, the
backtick program is expected to stay in the background and generate
output once in a while. In this case, the command is executed right
away and screen stores the last line of output. If a new line gets
printed screen will automatically refresh the hardstatus or the
captions."
The problem is that, if for some reason or other, I terminate the
GNU/sreen instance, the orphaned processes still run under the init
process.
As I was testing the layout of my hardstatus line the other day, I
eventually noticed--thanks to my monitoring, and the laptop's fan
kicking in :-) .. that I was using dollops of ram & cpu cycles .. well,
it turned out some 20-30 instances of my scripts and the related sleep
subprocesses were still running in the background.
Whenever I shut down a screen instance (manually terminating each
individual application), I would need to terminate those scripts as
well.. at the same time GNU/screen issues the "screen terminating"
message.
The problem is how?
Has anyone gone down this road before and found a clean solution?
Thanks,
CJ
- Killing backticks when bouncing screen.,
Chris Jones <=
Re: Killing backticks when bouncing screen., Trent W. Buck, 2009/01/23
Re: Killing backticks when bouncing screen., Gerhard Siegesmund, 2009/01/23