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Re: New FSM patch

From: Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>
To: Zdenek Kotala <Zdenek(dot)Kotala(at)Sun(dot)COM>
Cc: PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: New FSM patch
Date: 2008-09-11 12:16:49
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Lists: pgsql-hackers
Zdenek Kotala wrote:
> Does we need random_bool to spread workload? It seems to me a useless, 
> because it also invokes one backend to use more pages instead of using 
> one which is already in buffer cache.I think that it should generate a 
> lot of extra i/o. Do not forget WAL full page write for firstime 
> modified page.

random_bool() is gone in the latest version of the patch, in favor of a 
"next pointer". You must be looking at an old version, and I must've 
forgotten to update the link in the Wiki. That change was discussed in 
the "New FSM allocation policy" thread.

Anyway, here's is the new version for your convenience, and I also added 
a paragraph to the README, mentioning that the tree is degenerated from 
the right.

   Heikki Linnakangas

Attachment: fsm-lazy-3.patch.gz
Description: application/x-gzip (43.5 KB)

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