On 20 July 2017 at 15:00, Neha Sharma <neha.sha...@enterprisedb.com> wrote:

> Hi Craig,
> I had done a fresh initdb,the default parameter configuration was used. I
> was setting few set of parameters while startup by the below command.
> ./postgres -d postgres -c shared_buffers=$shared_bufs -N 200 -c
> min_wal_size=15GB -c max_wal_size=20GB -c checkpoint_timeout=900 -c
> maintenance_work_mem=1GB -c checkpoint_completion_target=0.9 &
> Now I have modified the script a bit with Robert's suggestion as below.
> Instead of starting it with postgres binary i have set it in conf file and
> starting the server with pg_ctl. I am waiting for the results,once the core
> dump is generated will share the details.


To verify that you do get a coredump, you might want to consider sending a
kill -SEGV to a backend and make sure that it actually dumps core and you
can find the core.

Ideally you'd actually set the coredumps to include shmem (see
coredump_filter in http://man7.org/linux/man-pages/man5/core.5.html), but
with 8GB shared_buffers that may not be practical. It'd be very useful if

If this is wraparound-related, as it appears to be, you might get faster
results by using a custom pgbench script for one or more workers that just
runs txid_current() a whole lot. Or jump the server's xid space forward.

I've got a few other things on right now but I'll keep an eye out and hope
for a core dump.

 Craig Ringer                   http://www.2ndQuadrant.com/
 PostgreSQL Development, 24x7 Support, Training & Services

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