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Re: PSPP goals

From: Ben Pfaff
Subject: Re: PSPP goals
Date: Wed, 03 Aug 2005 07:56:43 -0700
User-agent: Gnus/5.1007 (Gnus v5.10.7) Emacs/21.4 (gnu/linux)

John Darrington <address@hidden> writes:

> On Tue, Aug 02, 2005 at 07:10:15PM -0700, Ben Pfaff wrote:
>      John Darrington <address@hidden> writes:
>      > Some time ago I did an experiment on PSPP sorting  a data file with 
>      > ~8 million records.  It took about 20mins to do, but performed without 
> a hitch.
>      How big was each record?  
> 11 variables.

Let's set, that's about (8*11*8,000,000) / (1024*1024) = 671 MB.

>      What was the PSPP workspace size?
> Whatever the default is.

4 MB then.  So it probably had to do about 671*4 MB or roughly
2.5 GB of disk activity.  Not an unreasonable amount of time,
then, but it would probably be much faster with a bigger
workspace size.

Perhaps we should try to size the workspace based on the
machine's RAM size.
"I don't want to learn the constitution and the declaration of
 independence (marvelous poetry though it be) by heart, and worship the
 flag and believe that there is a god and the dollar is its prophet."
--Maarten Wiltink in the Monastery

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