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05.03.2007 at 11:08AM PDT, ID: 22551088
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How to monitor open file handles in a process

Asked by nswartz in HP-UX Unix, Unix Operating Systems

Tags: file, open, handles, process, monitor

We have a process that is running out of file handles. We are trying to address this problem with the vendor, but in the meantime we need to bounce it when it is getting near the limit. Currently we use Glance to see how many are in use. Is there some command line way to determine this that we can include into a cron script?Start Free Trial
 
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[+][-]05.03.2007 at 11:56AM PDT, ID: 19025815

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[+][-]05.03.2007 at 01:56PM PDT, ID: 19026855

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[+][-]05.03.2007 at 05:39PM PDT, ID: 19028121

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[+][-]05.04.2007 at 11:05AM PDT, ID: 19032800

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[+][-]05.04.2007 at 11:06AM PDT, ID: 19032811

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[+][-]05.08.2007 at 04:18AM PDT, ID: 19048858

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[+][-]05.08.2007 at 04:44AM PDT, ID: 19048962

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[+][-]05.13.2007 at 04:00AM PDT, ID: 19080781

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[+][-]05.17.2007 at 04:35PM PDT, ID: 19112628

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[+][-]05.20.2007 at 01:53PM PDT, ID: 19124032

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About this solution

Zones: HP-UX Unix, Unix Operating Systems
Tags: file, open, handles, process, monitor
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Solution Provided By: Vee_Mod
Participating Experts: 3
Solution Grade: B
 
 
 
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05.03.2007 at 11:56AM PDT, ID: 19025815
tfewster:
You could run Glance in background and redirect the output to a file, which could then be parsed for the info you need:
http://unix.derkeiler.com/Mailing-Lists/HP-UX-Admin/2003-05/0035.html
The problem would be with selecting/interpreting/formatting the data from the output file.

If you just want to check when the _system_ is running out of file handles, `sar -v` may be good enough for your needs
 
05.03.2007 at 01:56PM PDT, ID: 19026855
nswartz:
OK, that seems to work. I still need to figure out how to get the number of file handles for a specific process. The settings in that article provide the load average per cpu.
 
05.03.2007 at 05:39PM PDT, ID: 19028121
tfewster:
I _did_ say selection would be a problem ;-)

I don't have an HP-UX system with Glance, but if you can select a single process (-s Process_ID ?)  or list all open files for processes (-F ?)  from the command line and post the output, then (we) can help in interpreting the output using a script.

 
05.04.2007 at 11:05AM PDT, ID: 19032800
nswartz:
I found a better answer: If I use lsof -p <PID> it shows all the open files/sockets. I pipe into wc and it tells me the number of open file handles.
Thanks for the suggestions on glance. I think I can use that for other tasks.
tfewster: I will still give you the points for the good direction to research.
 
05.04.2007 at 11:06AM PDT, ID: 19032811
nswartz:
Also, glance has example scripts in /opt/perf/examples/adviser including a file handle monitor
 
05.08.2007 at 04:18AM PDT, ID: 19048858
siliconbrit:

Note that you can limit the number of file descriptors that a process can open, using the built-in unix command 'ulimit':

   ulimit -n 12       # will limit the number of *available* file descriptors to 12 + 1

If the process attempts to allocate an FD beyond this number, the behaviour is determined by the code itself, or if no provision is made by the code, the process will be issued a HUP or KILL signal, or be coredumped depending on the unix flavour.

The effect being that your process is stopped when it reaches a limit you have set.

The advantage of this method is that you can run a script that sets ulimit, then executes the underlying process in the FOREGROUND, but in a never ending loop.  When the process dies, the loop will cycle, and you can do some quick maintenance, and then restart the process.  No delays are necessary while you wait for a cron job to kick in.

Note that the semantics of ulimit are slightly different by flavour of unix, so you should test this technique thoroughly.
 
05.08.2007 at 04:44AM PDT, ID: 19048962
nswartz:
Actually, the reason I need to monitor is that I have a file handle leak that I cannot fix (in 3rd party code) and I need to be prepared to restart the process when the number available is getting low. The OS kernel is configured for 8000 per process. The process is already under a management system that restarts it, but I prefer to do it gracefully rather than waiting for errors.
 
05.13.2007 at 04:00AM PDT, ID: 19080781
tfewster:
Glad to hear you resolved the problem yourself; i suggest you post a (0 point) question in http://www.experts-exchange.com/Community_Support/General/ with the link to this question, asking them to accept your solution at
http://www.experts-exchange.com/Q_22551088.html#a19032800
as the answer and refund your points
 
05.17.2007 at 04:35PM PDT, ID: 19112628
Vee_Mod:
A request has been made in Community Support to close this question:
http://www.experts-exchange.com/Community_Support/General/Q_22578425.html

If there are no objections, a moderator will finalize this question in approximately 4 days by:
PAQ'ing the question and refunding the points
   
Please leave any recommendations here.

Vee_Mod
Experts Exchange Moderator
 
05.20.2007 at 01:53PM PDT, ID: 19124032
Vee_Mod:
Closed, 250 points refunded.
Vee_Mod
Community Support Moderator
Accepted Solution
 
 
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