Re: more on high load on postgres 7.4.16

Stefan Kaltenbrunner wrote:
> Geoffrey wrote:
>> We are trying to attack this problem from multiple avenues, thus I'm
>> starting a separate thread. This is with regard to the problem posted
>> via thread:
>>
>> http://archives.postgresql.org/pgsql-performance/2007-04/msg00120.php
>>
>> One thing we are seeing with this move to the new hardware (and rhas 4)
>> is database connection processes that are left over by users who have
>> exited the application. I've attached to these processes via gdb and
>> find they all have the same backtrace. Any insights into what might be
>> causing this issue would be appreciated. Understand, we did not have
>> this problem on the previous hardware running on rhes 3. Here is the
>> backtrace:
>>
>> #0 0x00ba47a2 in _dl_sysinfo_int80 () from /lib/ld-linux.so.2
>> #1 0x0019f1de in __lll_mutex_lock_wait () from /lib/tls/libpthread.so.0
>> #2 0x0019ca7a in _L_mutex_lock_23 () from /lib/tls/libpthread.so.0
>> #3 0xbfed9438 in ?? ()
>> #4 0x00c96a4e in pthread_cond_destroy@@GLIBC_2.3.2 () from
>> /lib/tls/libc.so.6
>> #5 0x00c96a4e in pthread_cond_destroy@@GLIBC_2.3.2 () from
>> /lib/tls/libc.so.6
>> #6 0x0015243f in critSec::~critSec () from
>> /usr/local/pcm170/libdalkutil.so
>> #7 0x003a48b8 in Comp_ZipFiles () from /usr/local/pcm170/libcompress.so
>
> /usr/local on RHEL should only contain software installed directly from
> source - what exactly is pcm170/libdalkutil ?

It is a third party package that we have build into the backend.
pcmiler. We do not have source to it though.

> beside that - is pg actually compiled with debugging symbols on that
> platform ?

Not yet, I'm building it now, but I was hoping that the limited info
above might get us some insights. I plan to try and recreate the
problem and reproduce a more useful backtrace after rebuilding
postgresql with debugging symbols.

--
Until later, Geoffrey

Those who would give up essential Liberty, to purchase a little
temporary Safety, deserve neither Liberty nor Safety.
- Benjamin Franklin