03-13-2008
zombie processes and hung process termination
Is there a way I can run a command that will run in the kernel or in the memory and automatically kill certain scripts if they get to <defunct> processes, without having to be monitoring the server manually?
I have a Perl script which runs for 20k members and normally does not have any problems, but today, like 8 times I seen an overload of processes that just seemed to 'hang' there with the same pid number and script name, and a few of them had <defunct> running there.
I have heard of something called a kill daemon, but don't know where to find details on how to program it.
Here is an example of what I seen:
Pid Owner Priority Cpu % Mem % Command
4613 username 0 29.0 1.0 perl -w web.cgi
4614 username 0 17.0 0.2 perl -w index.cgi
4616 username 0 27.0 0.0 [web.cgi] <defunct>
15519 username 0 0.1 0.0 perl -w web.cgi
15520 username 0 0.1 0.0 perl -w web.cgi
15521 username 0 0.1 0.0 perl -w web.cgi
15523 username 0 0.1 0.0 perl -w web.cgi
15535 username 0 0.1 0.0 perl -w web.cgi
15559 username 0 0.1 0.0 perl -w web.cgi
among other things
when that happened, the script web.cgi did not load, when it did, it took like 10 minutes to load! Crazy...
Normally we have no problems, so I ran a trace on a few of the pid processes.
I cannot tell what was causing the overload.
right now there appear to be 39 people on the website and no problems the processes are popping in and out as they should...
Anyhow I would appreciate any advice anyone can offer.
Thank you much,
Richard
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LEARN ABOUT FREEBSD
upsstats.cgi
UPSSTATS.CGI(8) NUT Manual UPSSTATS.CGI(8)
NAME
upsstats.cgi - Web-based UPS status viewer
SYNOPSIS
upsstats.cgi
Note
As a CGI program, this should be invoked through your web server. If you run it from the command line, it will either complain about
unauthorized access or spew a bunch of HTML at you.
DESCRIPTION
upsstats.cgi uses template files to build web pages containing status information from UPS hardware. It can repeat sections of those
template files to monitor several UPSes simultaneously, or focus on a single UPS.
These templates can also include references to upsimage.cgi(8) for graphical displays of battery charge levels, voltage readings, and the
UPS load.
ACCESS CONTROL
upsstats will only talk to upsd(8) servers that have been defined in your hosts.conf(5). If it complains that "Access to that host is not
authorized", check that file first.
TEMPLATES
The web page that is displayed is actually a template containing commands to upsstats which are replaced by status information. The default
file used for the overview is upsstats.html.
When monitoring a single UPS, the file displayed is upsstats-single.html.
The format of these files, including the possible commands, is documented in upsstats.html(5).
FILES
hosts.conf(5), upsstats.html(5), upsstats-single.html
SEE ALSO
upsimage.cgi(8)
Internet resources:
The NUT (Network UPS Tools) home page: http://www.networkupstools.org/
Network UPS Tools 05/22/2012 UPSSTATS.CGI(8)