[gmx-users] Error: relative constraint deviation after LINCS

Tom Joseph tom-lists at jambon.ll.cx
Wed Mar 29 19:00:46 CEST 2006


I second this, very strongly.  I wrestled with GROMACS for literally  
a week trying to figure out the PME bug, and would really have  
appreciated being able to easily learn about it.

The best solution to this, in my mind, is a 3.3.1 release with known  
bugs patched.  If this is unlikely to happen soon, I think I'll make  
my own unofficial one (perhaps with extra goodies such as the ported  
AMBER force fields).  Are there any other sources of information  
about known bugs/patches other than bugzilla.gromacs.org and CVS?

--Tom

On Mar 29, 2006, at 11:32 AM, David Mobley wrote:

> Regarding the PME bug, I know I've said this before, but I think it
> would be a lot easier for people to find out about these things if
> there were a single page somewhere on the site that lists all of the
> known bugs with each version (and preferably their symptoms) and
> possibly also links to fixes. If I were a new user and just
> downloading 3.3 for the first time, I don't know how I would know that
> there is a bug with PME without searching the archives of the mailing
> list. Maybe even the 3.3 source available to download could be updated
> with patches every so often? Again, I'm just a bit nervous that people
> may be having problems due to *known bugs* in 3.3 simply because there
> is no easy way to find out about these bugs or their solutions.
>
> David
>
> On 3/29/06, David van der Spoel <spoel at xray.bmc.uu.se> wrote:
>> Tom Joseph wrote:
>>> Curiously, what is pme_order set to in your mdp file? I  
>>> experienced a
>>> very similar problem as you did when I had set pme_order to 6, and I
>>> don't know why...
>> it's a known bug, please fetch the new pme.c from the ftp site.
>>>
>>> --Tom
>>>
>>> On Mar 28, 2006, at 10:28 PM, raja wrote:
>>>
>>>> Hi gmxs,
>>>>       No reply yet for this posting, so I reposting the same
>>>>       error...Please give me the direction.
>>>> With thanks !
>>>> B.Nataraj
>>>>
>>>> The Error part
>>>> ################################################################### 
>>>> #######################################
>>>>
>>>> step 0
>>>> Step 10, time 0.02 (ps)  LINCS WARNING
>>>> relative constraint deviation after LINCS:
>>>> max 0.002406 (between atoms 2664 and 2666) rms 0.000090
>>>> bonds that rotated more than 30 degrees:
>>>> atom 1 atom 2  angle  previous, current, constraint length
>>>>    2664   2665   31.5    0.1090   0.1091      0.1090
>>>> step 30, will finish at Tue Mar 28 14:14:30 2006
>>>> Step 38, time 0.076 (ps)  LINCS WARNING
>>>> relative constraint deviation after LINCS:
>>>> max 0.296349 (between atoms 2576 and 2577) rms 0.004434
>>>> bonds that rotated more than 30 degrees:
>>>> atom 1 atom 2  angle  previous, current, constraint length
>>>>    2576   2577   90.0    0.1090   0.1413      0.1090
>>>>    2578   2579   90.0    0.1090   0.1180      0.1090
>>>>
>>>> Step 39, time 0.078 (ps)  LINCS WARNING
>>>> relative constraint deviation after LINCS:
>>>> max 4821.659668 (between atoms 2584 and 2585) rms 70.115692
>>>> bonds that rotated more than 30 degrees:
>>>> atom 1 atom 2  angle  previous, current, constraint length
>>>>    2557   2559  104.4    0.1450   0.5221      0.1449
>>>>    2559   2560   87.2    0.1090   0.5446      0.1090
>>>>    2559   2561  118.5    0.1530   0.5012      0.1529
>>>>    2559   2572   99.8    0.1523   1.4141      0.1522
>>>>    2561   2562   82.9    0.1090   0.0423      0.1090
>>>>    2561   2563   69.9    0.1091   0.0341      0.1090
>>>>    2561   2564   34.2    0.1529   0.0840      0.1529
>>>>    2572   2573   88.1    0.1231   1.5691      0.1229
>>>>    2572   2574  110.8    0.1335   6.8042      0.1335
>>>>    2574   2575  106.0    0.1010   6.5640      0.1010
>>>>    2574   2576   81.3    0.1456   8.8651      0.1449
>>>>    2576   2577   41.1    0.1413   5.5404      0.1090
>>>>    2576   2578  112.6    0.1532  12.6753      0.1529
>>>>    2576   2588  100.3    0.1526  10.1017      0.1522
>>>>    2578   2579   87.1    0.1180  54.2609      0.1090
>>>>    2578   2580   92.4    0.1534  18.2981      0.1529
>>>>    2578   2584   88.1    0.1538  35.5616      0.1529
>>>>    2580   2581   89.1    0.1092   1.3620      0.1090
>>>>    2580   2582   90.1    0.1090   1.4119      0.1090
>>>>    2580   2583   88.1    0.1091   1.2295      0.1090
>>>>    2584   2585   90.0    0.1090 525.6699      0.1090
>>>>    2584   2586   91.5    0.1089  23.0823      0.1090
>>>>    2584   2587   92.0    0.1089  22.9080      0.1090
>>>>    2588   2589  104.3    0.1229   3.1250      0.1229
>>>>    2588   2590  115.1    0.1335   2.8415      0.1335
>>>>    2590   2591  109.1    0.1450   0.9337      0.1449
>>>>    2590   2599  108.6    0.1450   0.9203      0.1449
>>>>    2591   2592  112.4    0.1090   0.3062      0.1090
>>>>    2591   2593  108.3    0.1529   0.2859      0.1529
>>>>    2591   2602  120.1    0.1522   0.2576      0.1522
>>>>    2593   2594   43.8    0.1090   0.1570      0.1090
>>>>    2593   2595   45.3    0.1090   0.1562      0.1090
>>>>    2596   2597   30.6    0.1090   0.1273      0.1090
>>>>    2596   2598   41.2    0.1090   0.1451      0.1090
>>>>    2596   2599   96.6    0.1529   0.1996      0.1529
>>>>    2599   2600  133.4    0.1090   0.2447      0.1090
>>>>    2599   2601  135.4    0.1090   0.2755      0.1090
>>>>    2602   2603   32.1    0.1229   0.1593      0.1229
>>>>    2602   2604   32.6    0.1335   0.1740      0.1335
>>>> Segmentation fault (core dumped)
>>>> ################################################################### 
>>>> ############################
>>>>
>>>> --  raja
>>>>   raja_28 at fastmail.us
>>>>
>>>> --http://www.fastmail.fm - The way an email service should be
>>>>
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>>
>> --
>> David.
>> _____________________________________________________________________ 
>> ___
>> David van der Spoel, PhD, Assoc. Prof., Molecular Biophysics group,
>> Dept. of Cell and Molecular Biology, Uppsala University.
>> Husargatan 3, Box 596,          75124 Uppsala, Sweden
>> phone:  46 18 471 4205          fax: 46 18 511 755
>> spoel at xray.bmc.uu.se    spoel at gromacs.org   http://folding.bmc.uu.se
>> +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 
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