Re: [WIP] Reduce alignment requirements on 64-bit systems.

Bruce,

Thanks for adding this to the TODO.
I am planning on continuing to work on this patch after 8.4 releases.
I know we are in feature freeze and I do not want to sidetrack the
release process.

Thanks!

- Ryan


On Thu, Jan 8, 2009 at 8:41 AM, Bruce Momjian <bruce@momjian.us> wrote:
>
> Added to TODO:
>
>        Reduce data row alignment requirements on some 64-bit systems
>
>            * http://archives.postgresql.org/pgsql-hackers/2008-10/msg00369.php
>
>
> ---------------------------------------------------------------------------
>
> Ryan Bradetich wrote:
>> Hello all,
>>
>> Here is a proof-of-concept patch for reducing the alignment
>> requirement for heap tuples on 64-bit systems.
>> This patch passes the regression tests and a couple of other data sets
>> I have thrown at it.
>>
>> I am hoping to get some early feedback on this patch so I have time to
>> make any corrections, improvements,
>> etc before the November commit-fest deadline.
>>
>> There are two visible savings in the system catalogs using this patch
>> (size was gathered using \S+):
>>
>> Catalog              Pre-Patch Size      After Patch Size
>>
>> pg_depend         312 kB                  296 kB
>> pg_description    160 kB                  152 kB
>>
>>
>> One thing I am considering, but I am not sure if it is worth the code
>> uglification, is to wrap the majority of these
>> checks in #ifdefs so they only are used on 64-bit systems.   This
>> would completely eliminate the impact for this
>> patch on 32-bit systems, which would not gain any benefit from this patch.
>>
>> Feedback welcome!
>>
>> Thanks,
>>
>> - Ryan
>
> [ Attachment, skipping... ]
>
>>
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> --
>  Bruce Momjian  <bruce@momjian.us>        http://momjian.us
>  EnterpriseDB                             http://enterprisedb.com
>
>  + If your life is a hard drive, Christ can be your backup. +
>