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* 32 vs 64 bit build on Solaris Sparc
@ 2010-08-11 15:17 Joseph Conway <mail@joeconway.com>
0 siblings, 2 replies; 3+ messages in thread
From: Joseph Conway @ 2010-08-11 15:17 UTC (permalink / raw)
To: pgsql-performance
With a 16 CPU, 32 GB Solaris Sparc server, is there any conceivable
reason to use a 32 bit build rather than a 64 bit build? Apparently the
Sun PostgreSQL package includes a README that indicates you might want
to think twice about using 64 bit because it is slower -- this seems
like outdated advice, but I was looking for confirmation one way or the
other.
Also semi-related question: when building from source, using gcc,
enabling debug (but *not* assert) is normally not much of a performance
hit. Is the same true if you build with the Sun CC?
Thanks in advance for any thoughts/experiences.
Joe
--
Joe Conway
credativ LLC: http://www.credativ.us
Linux, PostgreSQL, and general Open Source
Training, Service, Consulting, & 24x7 Support
^ permalink raw reply [nested|flat] 3+ messages in thread
* Re: 32 vs 64 bit build on Solaris Sparc
@ 2010-08-11 15:23 Tom Lane <tgl@sss.pgh.pa.us>
parent: Joseph Conway <mail@joeconway.com>
1 sibling, 0 replies; 3+ messages in thread
From: Tom Lane @ 2010-08-11 15:23 UTC (permalink / raw)
To: Joseph Conway <mail@joeconway.com>; +Cc: pgsql-performance
Joseph Conway <mail@joeconway.com> writes:
> Also semi-related question: when building from source, using gcc,
> enabling debug (but *not* assert) is normally not much of a performance
> hit. Is the same true if you build with the Sun CC?
Most non-gcc compilers disable optimization altogether if you enable
debug :-(. Perhaps that isn't true of Sun's, but I'd check its
documentation before considering --enable-debug for a production build.
regards, tom lane
^ permalink raw reply [nested|flat] 3+ messages in thread
* Re: 32 vs 64 bit build on Solaris Sparc
@ 2010-08-12 07:32 Dimitri <dimitrik.fr@gmail.com>
parent: Joseph Conway <mail@joeconway.com>
1 sibling, 0 replies; 3+ messages in thread
From: Dimitri @ 2010-08-12 07:32 UTC (permalink / raw)
To: Joseph Conway <mail@joeconway.com>; +Cc: pgsql-performance
Hi Joe,
the general rule on Solaris SPARC is:
- if you need to address a big size of memory (over 4G): compile in 64bit
- otherwise: compile in 32bit ;-)
It's true that 32bit code will run faster comparing to 64bit ont the
64bit SPARC - you'll operate with 2 times shorter addresses, and in
some cases SPARC will be able to execute 2 operations in parallel on
32bit code, while it'll be still one operation on 64bit code.. - But
it's all about the code, because once you start to do I/O requests all
kind of optimization on the instructions will be lost due I/O latency
;-))
So, as usual, a real answer in each case may be obtained only by a real test..
Just test both versions and you'll see yourself what is a valid in
your case :-))
Same problem regarding compilers: in some cases GCC4 will give a
better result, in some cases Sun Studio will be better (there are many
posts in blogs about optimal compiler options to use).. - don't
hesitate to try and don't forget to share here with others :-))
Rgds,
-Dimitri
On 8/11/10, Joseph Conway <mail@joeconway.com> wrote:
> With a 16 CPU, 32 GB Solaris Sparc server, is there any conceivable
> reason to use a 32 bit build rather than a 64 bit build? Apparently the
> Sun PostgreSQL package includes a README that indicates you might want
> to think twice about using 64 bit because it is slower -- this seems
> like outdated advice, but I was looking for confirmation one way or the
> other.
>
> Also semi-related question: when building from source, using gcc,
> enabling debug (but *not* assert) is normally not much of a performance
> hit. Is the same true if you build with the Sun CC?
>
> Thanks in advance for any thoughts/experiences.
>
> Joe
>
>
>
> --
> Joe Conway
> credativ LLC: http://www.credativ.us
> Linux, PostgreSQL, and general Open Source
> Training, Service, Consulting, & 24x7 Support
>
>
> --
> Sent via pgsql-performance mailing list (pgsql-performance@postgresql.org)
> To make changes to your subscription:
> http://www.postgresql.org/mailpref/pgsql-performance
>
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2010-08-11 15:17 32 vs 64 bit build on Solaris Sparc Joseph Conway <mail@joeconway.com>
2010-08-11 15:23 ` Tom Lane <tgl@sss.pgh.pa.us>
2010-08-12 07:32 ` Dimitri <dimitrik.fr@gmail.com>
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