[dsc] CPU problem

[Duane Wessels]

You probably need to increase the corefile size limit.  Try 'ulimit -c unlimited' before you run dsc.

DW


On Wed, 5 Mar 2014, Elias Abacioglu wrote:

> no core file :( I guess the ubuntu package isn't built with debugging symbols
> 
> 
> 2014-03-05 9:55 GMT+01:00 Elias Abacioglu <elias.rabi at gmail.com>:
>       Hi Duane,
>       I've attached the output from the debug run. I doubt it will show anything since it doesn't spike the CPU instantly. It
>       does it after it's been running for some time.
> I just restarted DSC(and running in foreground so I get the output). When it goes to 100% CPU I will do a kill -ABRT.
> ulimit -c was 0 so I guess unlimited size of core file.
> 
> 
> Thanks!
> Elias
> 
> 
> 2014-03-04 14:53 GMT+01:00 Duane Wessels <wessels at measurement-factory.com>:
>
>       Hello Elias,
>
>       I have two suggestions:
>
>       1) you can run dsc in a debugging mode.  For example:
>
>          $ sudo dsc -d -f /usr/local/etc/dsc/dsc.conf
>
>          that might help identify the problem.
>
>       2) second option is to send the running process an ABRT signal
>          while it is running:
>          $ sudo kill -ABRT dsc-pid
>
>         That signal should cause the dsc process to make a core dump, although
>         sometimes you have take some extra steps to make sure the core file
>         gets created.  Check "ulimit -c" and make sure dsc's working directory
>         is writable.
>
>         When you have a core dump, and if the binary is compiled with debugging
>         symbols, then you can use gdb to pinpoint where its getting stuck.
>
>       DW
> 
>
>       On Tue, 25 Feb 2014, Elias Abacioglu wrote:
>
>       Hi all,
>
>       I've joined this mailing list cause I have what I would assume to be an
>       unusual problem.
>       I have 5 name servers running bind 9 and with similar setup.
>
>       DSC works on all of them but causes problem on the fifth.
>       It uses 100% CPU on one core.
>       I tried updating the entire system (apt-get update && apt-get upgrade). It
>       did not help.
>       DSC is installed using a configuration manager so installation is identical.
>
>       On all servers it spawns two processes, these two
>       /usr/bin/dsc -p /var/run/dsc-statistics-collector/dsc-collector_default.cfg
>       \_ [dsc] <defunct>
>
>       But on that faulty server after a short while it starts eating the CPU. And
>       it doesn't seem to be so more DNS usage on that nameserver.
>       The version is 201106061022-4, which is the one found in Ubuntu 12.04
>       (precise) repos.
>       $ cat /etc/issue
>       Ubuntu 12.04.3 LTS \n \l
>
>       How should I continue with this? Can't have one of two cores running at
>       100% all the time.
>
>       Regards,
>       Elias
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> 
> 
> 
>