[gmx-users] mpi version

[Prasad Gajula]

Dear Gromacs Users,

when I make simulations for my molecule using the mdp opton
constraints=none or hbonds, it is running well on 2 nodes( i.e 4
processors)
but, when I use the option constraints=all-bonds grompp giving an error
message like this.......
Checking consistency between energy and charge groups...
splitting topology...
Walking down the molecule graph to make shake-blocks
There are 3754 charge group borders and 8 shake borders
There are 13 total borders
Division over nodes in atoms:
     0  6047  2335   449
Fatal error: Shake block crossing node boundaries
constraint between atoms (5685,8748)


But, when I use only one processor it is working well for constrints=
all-bonds too.
Could any one suggest me what should I do now to use 4 processors to work
for my md simulations with mdp option constraints=all-bonds!
PS: I am freezing the Backbone during my run..hope it is irrelevant.
Thank you very much in advance!
Best regards
Gajula