From: | Zdenek Kotala <Zdenek(dot)Kotala(at)Sun(dot)COM> |
---|---|
To: | Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com> |
Cc: | pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: Page layout footprint |
Date: | 2008-09-05 10:35:54 |
Message-ID: | 48C10B8A.5080703@sun.com |
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Lists: | pgsql-hackers |
Heikki Linnakangas napsal(a):
> Zdenek Kotala wrote:
>> Heikki Linnakangas napsal(a):
<snip>
> AFAICS you can get all the same information from pg_controldata. We have
> a pretty good idea of the alignments of all the usual platforms anyway.
> If someone says in a bug report that they're running on x86_64 or 32-bit
> Sparc, we know what the alignments on those platforms are.
>
>>> And if you're working at such a low level, it's not that hard to
>>> calculate the offsets within the struct manually.
>>
>> I'm not sure if it is so easy. Are you able do it for SPARC, PPC or
>> other non x86 CPUs?
>
> Not off the top of my head. But I am able to do it on x86 and x86_64
> which are the platforms I work and debug on.
OK. You convinced me that information could be collected from other sources.
<snip>
>> It could also report changes in alignment.
>
> Huh? I would be pretty surprised if the alignment changed randomly on
> some platform.
I thought if somebody change compiler switches - for example 32/64 compilation.
But it is probably rare case.
Zdenek
--
Zdenek Kotala Sun Microsystems
Prague, Czech Republic http://sun.com/postgresql
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