| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Gavin Sherry <swm(at)linuxworld(dot)com(dot)au> |
| Cc: | Qingqing Zhou <zhouqq(at)cs(dot)toronto(dot)edu>, pgsql-patches(at)postgresql(dot)org |
| Subject: | Re: remove BufferBlockPointers for speed and space |
| Date: | 2005-08-11 06:02:37 |
| Message-ID: | 18878.1123740157@sss.pgh.pa.us |
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| Lists: | pgsql-patches |
Gavin Sherry <swm(at)linuxworld(dot)com(dot)au> writes:
> On Thu, 11 Aug 2005, Qingqing Zhou wrote:
>> It is said that the BufferBlockPointers is used to speedup the
>> BufferGetBlock() macro. I compared three ways of getting block pointers.
> Do you have results for more recent gcc releases?
Or more than one hardware architecture (which you didn't even say what
you tested...)
Also, I would like to see the actual test code. I wonder whether what
you measured is the ability of the compiler to optimize references to
successive elements of an array inside a loop; that has little or
nothing to do with the typical usage of BufferGetBlock().
regards, tom lane
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