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Thread: profiling PL/pgSQL?

profiling PL/pgSQL?

From
Drew Wilson
Date:
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

Re: profiling PL/pgSQL?

From
"A. Kretschmer"
Date:
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

Re: profiling PL/pgSQL?

From
Richard Huxton
Date:
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

Re: profiling PL/pgSQL?

From
"Jonah H. Harris"
Date:
On 11/3/06, Richard Huxton <dev@archonet.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@enterprisedb.com
Iselin, New Jersey 08830            | http://www.enterprisedb.com/

Re: profiling PL/pgSQL?

From
Date:
> 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@enterprisedb.com
  EnterpriseDB      http://www.enterprisedb.com