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Re: 8192 BLCKSZ ?

From: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
To: Don Baccus <dhogaza(at)pacifier(dot)com>
Cc: Mitch Vincent <mitch(at)venux(dot)net>, Christopher Kings-Lynne <chriskl(at)familyhealth(dot)com(dot)au>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: 8192 BLCKSZ ?
Date: 2000-11-28 02:30:48
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-hackers
> At 08:39 PM 11/27/00 -0500, Bruce Momjian wrote:
> >[ Charset ISO-8859-1 unsupported, converting... ]
> >> If it breaks anything in PostgreSQL I sure haven't seen any evidence -- the
> >> box this database is running on gets hit pretty hard and I haven't had a
> >> single ounce of trouble since I went to 7.0.X
> >
> >Larger block sizes mean larger blocks in the cache, therefore fewer
> >blocks per megabyte.  The more granular the cache, the better.
> Well, true, but when you have 256 MB or a half-gig or more to devote to
> the cache, you get plenty of blocks, and in pre-PG 7.1 the 8KB limit is a
> pain for a lot of folks.

Agreed.  The other problem is that most people have 2-4MB of cache, so a
32k default would be too big for them.

  Bruce Momjian                        |
  pgman(at)candle(dot)pha(dot)pa(dot)us               |  (610) 853-3000
  +  If your life is a hard drive,     |  830 Blythe Avenue
  +  Christ can be your backup.        |  Drexel Hill, Pennsylvania 19026

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