From khansen at stat.Berkeley.EDU  Tue Jan  3 14:14:00 2006
From: khansen at stat.Berkeley.EDU (Kasper Daniel Hansen)
Date: Tue, 3 Jan 2006 14:14:00 +0100
Subject: [Rd] checkpointing
In-Reply-To: <Pine.GSO.4.31.0601030832230.5822-100000@markov.stats>
References: <Pine.GSO.4.31.0601030832230.5822-100000@markov.stats>
Message-ID: <BCA2993F-D89F-4054-BB33-495B2EA8B74F@stat.berkeley.edu>

On Jan 3, 2006, at 9:36 AM, Brian D Ripley wrote:

> I use save.image() or save(), which seem exactly what you are  
> asking for.

I have the (perhaps unsupported) impression that Ross wanted to save  
the progress during the optim run. Since it spends most of its time  
in the .Internal(optim(***)) call, save/save.image would not work.

/Kasper

> On Mon, 2 Jan 2006, Ross Boylan wrote:
>
>> I would like to checkpoint some of my calculations in R, specifically
>> those using optim.  As far as I can tell, R doesn't have this  
>> facility,
>> and there seems to have been little discussion of it.
>>
>> checkpointing is saving enough of the current state so that work can
>> resume where things were left off if, to take my own example, the  
>> system
>> crashes after 8 days of calculation.
>>
>> My thought is that this could be added as an option to optim as  
>> one of
>> the control parameters.
>>
>> I thought I'd check here to see if anyone is aware of any work in  
>> this
>> area or has any thoughts about how to proceed.  In particular, is  
>> save a
>> reasonable way to save a few variables to disk?  I could also make  
>> the
>> code available when/if I get it working.
>
> -- 
> Brian D. Ripley,                  ripley at stats.ox.ac.uk
> Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
> University of Oxford,             Tel:  +44 1865 272861 (self)
> 1 South Parks Road,                     +44 1865 272866 (PA)
> Oxford OX1 3TG, UK                Fax:  +44 1865 272595
>
> ______________________________________________
> R-devel at r-project.org mailing list
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[Rd] checkpointing
Kasper Daniel Hansen