Using GDB with MADlib

[Ed Espino <es...@apache.org>]

While I was trying to track down the cause of MADLIB-1068, I managed to put
Postgres/MADlib under the debugger (gdb) and thought the configuration
would be of some help to someone. Essentially, I built postgres with the
following configure options:

configure --enable-cassert --enable-debug --with-python

I then was able to start a psql session and attach to the running session
with gdb. This allows one to set breakpoints, review variable values and
all the other cool gdb debugging techniques. There is a reasonable amount
of information one can find on using gdb and on the web. It was much easier
than I originally envisioned. If anyone needs assistance with the setup,
please don't hesitate to ping me.

Happy MADilb Debugging,
-=e

-- 
*Ed Espino*

Re: Using GDB with MADlib

[Ed Espino <es...@apache.org>]

I will add a new section "Debugging and Developing" to the wiki. And
fortunately, I have permission to edit the wiki (Thanks Orhan). When I have
the section created with content, I'll let the dev team know.

Regards,
-=e

On Mon, Aug 7, 2017 at 4:39 PM, Roman Shaposhnik <ro...@shaposhnik.org>
wrote:

> On Mon, Aug 7, 2017 at 2:46 PM, Ed Espino <es...@apache.org> wrote:
> > While I was trying to track down the cause of MADLIB-1068, I managed to
> put
> > Postgres/MADlib under the debugger (gdb) and thought the configuration
> > would be of some help to someone. Essentially, I built postgres with the
> > following configure options:
> >
> > configure --enable-cassert --enable-debug --with-python
> >
> > I then was able to start a psql session and attach to the running session
> > with gdb. This allows one to set breakpoints, review variable values and
> > all the other cool gdb debugging techniques. There is a reasonable amount
> > of information one can find on using gdb and on the web. It was much
> easier
> > than I originally envisioned. If anyone needs assistance with the setup,
> > please don't hesitate to ping me.
>
> This is a pretty awesome tidbit! Any chance you can contribute it to the
> wiki?
>    https://cwiki.apache.org/confluence/display/MADLIB/
>
> Perhaps even a brand new section on Debugging and Developing?
>
> Thanks,
> Roman.
>



-- 
*Ed Espino*

Re: Using GDB with MADlib

[Roman Shaposhnik <ro...@shaposhnik.org>]

On Mon, Aug 7, 2017 at 2:46 PM, Ed Espino <es...@apache.org> wrote:
> While I was trying to track down the cause of MADLIB-1068, I managed to put
> Postgres/MADlib under the debugger (gdb) and thought the configuration
> would be of some help to someone. Essentially, I built postgres with the
> following configure options:
>
> configure --enable-cassert --enable-debug --with-python
>
> I then was able to start a psql session and attach to the running session
> with gdb. This allows one to set breakpoints, review variable values and
> all the other cool gdb debugging techniques. There is a reasonable amount
> of information one can find on using gdb and on the web. It was much easier
> than I originally envisioned. If anyone needs assistance with the setup,
> please don't hesitate to ping me.

This is a pretty awesome tidbit! Any chance you can contribute it to the wiki?
   https://cwiki.apache.org/confluence/display/MADLIB/

Perhaps even a brand new section on Debugging and Developing?

Thanks,
Roman.