Re: [gmx-users] Can a Serial MD simulation be continued in, Parallel?

2006-06-29 Thread Mark Abraham

Sridhar Acharya wrote:

Hi,

But will that not do a new simulation  rather than an exact continuation 
of the previous simulation?


Only if you tell it to As it says in the documentation (for example, 
man grompp), you can supply the magic information for continuing 
simulations from the .edr and .trr files to either grompp or tpbconv and 
achieve exact restarts. Make sure you read the caveats on that manpage 
on the contents of your .mdp file.


Mark
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Re: Re: [gmx-users] Can a Serial MD simulation be continued in, Parallel?

2006-06-29 Thread Sridhar Acharya

Hi,

But will that not do a new simulation  rather than an exact continuation of the 
previous simulation?


sridhar


--

Message: 4
Date: Thu, 29 Jun 2006 18:48:45 +1000
From: Mark Abraham <[EMAIL PROTECTED]>
Subject: Re: [gmx-users] Can a Serial MD simulation be continued in
    Parallel?
To: Discussion list for GROMACS users 
Message-ID: <[EMAIL PROTECTED]>
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Sridhar Acharya wrote:


Dear GMX-users

I want to know whether a MD simulation that was run as a serial job 
could be continued in parallel using tpbconv?

If so, how to give the number of processors for the command?
 

There's no reason you couldn't use grompp with the .trr and .edr files 
as inputs to generate a .tpr for a different number of processors. There 
must be a numerical perturbation to your model physics in doing so - 
you're adding up lists of numbers in different orders - but the effect 
should be negligible within the MM approximation. Mark 
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Re: [gmx-users] Can a Serial MD simulation be continued in Parallel?

2006-06-29 Thread Mark Abraham

Sridhar Acharya wrote:

Dear GMX-users

I want to know whether a MD simulation that was run as a serial job 
could be continued in parallel using tpbconv?

If so, how to give the number of processors for the command?


There's no reason you couldn't use grompp with the .trr and .edr files 
as inputs to generate a .tpr for a different number of processors. There 
must be a numerical perturbation to your model physics in doing so - 
you're adding up lists of numbers in different orders - but the effect 
should be negligible within the MM approximation.


Mark
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