Re: polyphase merge?

From: Simon Riggs <simon(at)2ndQuadrant(dot)com>
To: Greg Stark <stark(at)enterprisedb(dot)com>
Cc: Don Marvick <donmarvick(at)gmail(dot)com>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: polyphase merge?
Date: 2009-02-04 15:11:06
Message-ID: 1233760266.4500.296.camel@ebony.2ndQuadrant
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On Wed, 2009-02-04 at 10:55 +0000, Greg Stark wrote:
> Is this basically the same as our current algorithm but without
> multiplexing the tapes onto single files? I have been wondering
> whether we multiplex the tapes any better than filesystems can lay out
> separate files actually.

I don't think you'll be able to do that more efficiently than we already
do. Read the top of tuplesort.c

--
Simon Riggs www.2ndQuadrant.com
PostgreSQL Training, Services and Support

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