[r-t] Big searches

Mike Ovenden mike.ovenden at homecall.co.uk
Thu Dec 27 01:58:06 UTC 2007

Maybe it's more informative to say no than to say nothing, so...

A few years back, there was a thread about MUG minor; Ander Holroyd found a 
neat 5-part with some half lead singles.  Out of curiosity I subsequently 
ran a search for 720s with bob=14, single=1456, at the section end.  It took 
several months to complete (and I had to give Cathy a way of stopping it 
when she wanted to use the machine), but sadly I have no idea how many 
nodes.  Since the machine was slow by current standards, I'm guessing not so 
many.  Didn't find any 720s BTW.  I've not had sufficient persistence to run 
anything remotely that big since!


----- Original Message ----- 
From: "Mark Davies" <mark at snowtiger.net>
To: <ringing-theory at bellringers.net>
Sent: Sunday, December 16, 2007 10:06 PM
Subject: [r-t] Big searches

> Time for a "mine's bigger than yours" competition. Who has run the biggest
> machine search, measured by number of nodes searched?
> I'll start - I've got a search on the go at the moment which has just 
> tipped
> over the 100 trillion node mark. It's been running for 432 hours so far,
> with an average of just less than 100,000 compositions found and checked 
> per
> second, every second. By the time it's finished it should have searched 
> 300
> trillion nodes.
> Anyone got anything bigger? I've run longer searches in the past, but on
> older hardware, so I think this is a node highwatermark for me.
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