From: | Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com> |
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To: | Alexander Korotkov <aekorotkov(at)gmail(dot)com> |
Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: WIP: Fast GiST index build |
Date: | 2011-08-30 10:41:00 |
Message-ID: | 4E5CBE3C.6030404@enterprisedb.com |
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Lists: | pgsql-hackers |
On 30.08.2011 13:29, Alexander Korotkov wrote:
> On Tue, Aug 30, 2011 at 1:13 PM, Heikki Linnakangas<
> heikki(dot)linnakangas(at)enterprisedb(dot)com> wrote:
>
>> So, over 50% of the CPU time is spent in choosing a block from the
>> temporary files. That should be pretty easy to improve..
>>
> Yes, probably we can just remove free blocks sorting.
I'm re-running the tests with that change now. It seems like using the
list of free blocks as a simple stack would be better anyway, it
probably yields a better cache hit ratio when we re-use blocks that have
just been released.
--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com
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