I now performed:

make distclean
./configure --disable-float
make
make install
make links


All executed without problems. Now I no longer have segmentation faults (thanks David!), however the energy minimization still does not achieve 1E-05 kJ / mole nm convergence (only as good as ~5E-04 for pentane). When I looked in the *.tpr file I saw that the coordinates are still given to three significant figures, meaning that the last two decimal places (fourth and fifth to the right of the decimal point) are always zero. I understood from Ran that this means the data is still in single-precision. How could this be?

Can anyone please help me get proper, double-precision from my simulations?


Thanks, and have a glorious week.

Inon.


Quoting "David Osguthorpe" <[EMAIL PROTECTED]>:


   Could it be that this, second, compilation might have caused
some
   problems -- I had GROMACS compiled in single-precision, and it
worked
   fine -- could compiling in double-precision after the initial
   single-precision overrun some files? I'm not sure anymore...


from experience if you recompile in a directory from a previous
GROMACS
single precision make you need to do make distclean before
switching
to double
- otherwise you do get random problems such as segfaults/infinite
forces

David
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Inon   Sharony
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