Re: profiling PL/pgSQL?

I have 700 lines of non-performant pgSQL code that I'd like to
profile to see what's going on.

What's the best way to profile stored procedures?

Thanks,

Drew

am Fri, dem 03.11.2006, um 3:12:14 -0800 mailte Drew Wilson folgendes:
> I have 700 lines of non-performant pgSQL code that I'd like to
> profile to see what's going on.
>
> What's the best way to profile stored procedures?

RAISE NOTICE, you can raise the aktual time within a transaction with
timeofday()

Andreas
--
Andreas Kretschmer
Kontakt: Heynitz: 035242/47215, D1: 0160/7141639 (mehr: -> Header)
GnuPG-ID: 0x3FFF606C, privat 0x7F4584DA http://wwwkeys.de.pgp.net

A. Kretschmer wrote:
> am Fri, dem 03.11.2006, um 3:12:14 -0800 mailte Drew Wilson folgendes:
>> I have 700 lines of non-performant pgSQL code that I'd like to
>> profile to see what's going on.
>>
>> What's the best way to profile stored procedures?
>
> RAISE NOTICE, you can raise the aktual time within a transaction with
> timeofday()

Of course you only have very small values of "best" available with
plpgsql debugging.

There's a GUI debugger from EnterpriseDB I believe, but I've no idea how
good it is. Any users/company bods care to let us know?

--
Richard Huxton
Archonet Ltd

On 11/3/06, Richard Huxton <dev(at)archonet(dot)com> wrote:
> There's a GUI debugger from EnterpriseDB I believe, but I've no idea how
> good it is. Any users/company bods care to let us know?

If you visit:
http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/edb-debugger/#dirlist

We have both a PL/pgSQL profiler and tracer available.

--
Jonah H. Harris, Software Architect | phone: 732.331.1300
EnterpriseDB Corporation | fax: 732.331.1301
33 Wood Ave S, 2nd Floor | jharris(at)enterprisedb(dot)com
Iselin, New Jersey 08830 | http://www.enterprisedb.com/

> > am Fri, dem 03.11.2006, um 3:12:14 -0800 mailte Drew Wilson folgendes:
> >> I have 700 lines of non-performant pgSQL code that I'd like to
> >> profile to see what's going on.
> >>
> >> What's the best way to profile stored procedures?
> >
> > RAISE NOTICE, you can raise the aktual time within a transaction with
> > timeofday()
>
> Of course you only have very small values of "best" available with
> plpgsql debugging.
>
> There's a GUI debugger from EnterpriseDB I believe, but I've no idea how
> good it is. Any users/company bods care to let us know?

It's an excellent debugger (of course, I'm a bit biased).

We are working on open-sourcing it now - we needed some of the plugin
features in 8.2.

As Jonah pointed out, we also have a PL/pgSQL profiler (already
open-sourced but a bit tricky to build). The profiler tells you how
much CPU time you spent at each line of PL/pgSQL code, how many times
you executed each line of code, and how much I/O was caused by each line
(number of scans, blocks fetched, blocks hit, tuples returned, tuples
fetched, tuples inserted, tuples updated, tuples deleted).

It's been a while since I looked at it, but I seem to remember that it
spits out an XML report that you can coax into a nice HTML page via the
XSLT.

The plugin_profiler needs to be converted over to the plugin
architecture in 8.2, but that's not a lot of work.

-- Korry

--
Korry Douglas korryd(at)enterprisedb(dot)com
EnterpriseDB http://www.enterprisedb.com