# Gmx mdrun on gpu problem

**URL:** <https://gromacs.bioexcel.eu/t/gmx-mdrun-on-gpu-problem/11115>\
**Category:** User discussions\
**Tags:** mdrun\
**Created:** [January 22, 2025, 6:42pm UTC](https://gromacs.bioexcel.eu/t/gmx-mdrun-on-gpu-problem/11115 "2025-01-22T18:42:16Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![dulal](https://avatars.discourse-cdn.com/v4/letter/d/fbc32d/32.png) [@dulal](https://gromacs.bioexcel.eu/u/dulal)\
**Post date:** [January 22, 2025, 6:42pm UTC](https://gromacs.bioexcel.eu/t/gmx-mdrun-on-gpu-problem/11115/1 "2025-01-22T18:42:16Z")

</div>

GROMACS version:  
GROMACS modification: Yes/No  
Here post your question

Dear Experts,  
I get the following error message upon the running gmx mdrun command in constant ph gromacs version.

```
     :-) GROMACS - gmx mdrun, 2024-dev-20241209-eba91f0-unknown (-:

```

Executable: /home/srabani/gromacs\_constant/bin/gmx  
Data prefix: /home/srabani/gromacs\_constant  
Working dir: /home/srabani/dulal/gromacs/constant\_ph/ph7  
Command line:  
gmx mdrun -s equil\_lambda7.tpr -o equil\_lambda7.trr -cpo equil\_lambda7.cpt -c equil\_lambda7.gro -g equil\_lambda7.log -e equil\_lambda7.edr -lambdaout equil\_lambda7.dat -gpu\_id 0

Reading file equil\_lambda7.tpr, VERSION 2024-dev-20241209-eba91f0-unknown (single precision)

* * *

Program: gmx mdrun, version 2024-dev-20241209-eba91f0-unknown  
Source file: src/gromacs/mdrun/runner.cpp (line 1100)  
Function: gmx::Mdrunner::mdrunner()::\<lambda()\>  
MPI rank: 0 (out of 4)

Assertion failed:  
Condition: !PAR(cr) || hasCustomParallelization || canUseDomainDecomposition  
A parallel run should not arrive here without DD support

For more information and tips for troubleshooting, please check the GROMACS  
website at [Common Errors — GROMACS webpage https://www.gromacs.org documentation](http://www.gromacs.org/Documentation/Errors)  
Thanking you