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Re: Re: [RFC][PATCH]: CRC32 is limiting at COPY/CTAS/INSERT ... SELECT + speeding it up

From: Greg Stark <gsstark(at)mit(dot)edu>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Bruce Momjian <bruce(at)momjian(dot)us>, Andres Freund <andres(at)anarazel(dot)de>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: Re: [RFC][PATCH]: CRC32 is limiting at COPY/CTAS/INSERT ... SELECT + speeding it up
Date: 2010-05-30 16:29:31
Message-ID: AANLkTimbsXVc9SUXl6YtbCtHe-ck2sJZmEY4b4aAjjWv@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-hackers
On Sun, May 30, 2010 at 4:54 AM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> I read through that thread and couldn't find much discussion of
> alternative CRC implementations --- we spent all our time on arguing
> about whether we needed 64-bit CRC or not.

Alright, how about this thread?

http://thread.gmane.org/gmane.comp.db.postgresql.devel.general/71741

This actually sounds like precisely the same algorithm. Perhaps this
implementation is much better but your tests on the old one showed a
big difference between smaller and larger data sequences.


-- 
greg

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Subject: Re: Re: [RFC][PATCH]: CRC32 is limiting at COPY/CTAS/INSERT ... SELECT + speeding it up
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