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Re: [ccp4bb] CNS problem: anneal.inp segmentation fault

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CCP4bb <-- 1999 <-- November 1999 <-- 30 November 1999
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From: Subramanian Karthikeyan skarthik14 {- at -} GMAIL {- dot -} COM
Date: 2007-05-28
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Date: 2007-05-28


Subject: Re: CNS problem: anneal.inp segmentation fault
From: jean jean {- at -} SCIENCE {- dot -} UCT {- dot -} AC {- dot -} ZA
Date: 2007-05-28

Hi all



I seem to have got it to work, although the reason for the problem remains a
mystery.



There seems to have been an error in the protein component (by a process of
elimination) of my pdb file that did not affect minimzation, but caused
torsion angle dynamics to fail.

In the end, I did a bit more building, output a new pdb file, used a new
copy of generate.inp - and now it works.



Thanks again to everyone who's been scratching their heads with me!

Jean

_____

From: cnsbb@yahoogroups.com [mailto:cnsbb@yahoogroups.com] On Behalf Of jean
Sent: 22 May 2007 12:56
To: CCP4BB@JISCMAIL.AC.UK; cnsbb@yahoogroups.com
Subject: [cnsbb] RE: [ccp4bb] CNS problem: anneal.inp segmentation fault



Thank you all for your suggestions. Unfortunately I am still stuck with the
segmentation fault problem.



The swap partition is mounted fine.

Setting max_chains to a lower number does nothing.

There's nothing wrong with my selection criteria (0 atoms were selected as
rigid groups, 36 for annealing)



I tried systematically deleting parts of the pdb input file, then rerunning
generate.inp and then anneal.inp. That worked fine for my ligand alone (as
I understand it, given the right toppar inputs, CNS should be able to run
torsion dynamics on my ligand - am I right?), but the protein component
caused failure again. I can't spot a problem by looking so I'm at a bit of
a loss.



Any more ideas?



Sincerely

Jean



_____

From: CCP4 bulletin board [mailto:CCP4BB@JISCMAIL.AC.UK] On Behalf Of jean
Sent: 11 May 2007 12:45
To: CCP4BB@JISCMAIL.AC.UK
Subject: [ccp4bb] CNS problem: anneal.inp segmentation fault



Hi all



Apologies for the non-ccp4 question - hopefully some of you who use CNS can
help me - I have a problem with anneal.inp in CNS:



When I run the anneal script for my structure containing novel ligand, the
program fails before the start of the torsion dynamics with no error message
- except SEGMENTATION FAULT at the bash commandline.



With "quiet" output, the last lines in the output file are:



ASSFIL: file /usr/local/CNS/cns_solve_1.1/libraries/toppar/torsionmdmods
opened.

MESSage=NORM

EVALUATE: symbol $MESSAGE_OLD_TMOD set to "NORM" (string)

ECHO=FALSe {OFF}

EVALUATE: symbol $ECHO_OLD_TMOD set to FALSE (logical)

NEXTCD: condition evaluated as false

Program version= 1.1 File version= 1.1

SELRPN: 0 atoms have been selected out of 4883



so the torsionmods routine (and everything before it) ran fine but the
torsion dynamics never started.



My pdb, mtf, top and par files all work fine for minimization so I don't
think there's anything wrong with them.



I have been using CNSv1.1 on this Linux machine for some time so it's not a
compile problem.



I can run the same routine on the same PC, from the same script, with the
same protein but with a different ligand and there's no fault.



Can anyone suggest a solution? I've tried just about everything short of
running the whole script manually from the command line!



Sincerely

Jean Watermeyer





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