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pppm_gpu.h
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Mon, Nov 11, 19:41

pppm_gpu.h
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/* -*- c++ -*- ----------------------------------------------------------
LAMMPS - Large-scale Atomic/Molecular Massively Parallel Simulator
http://lammps.sandia.gov, Sandia National Laboratories
Steve Plimpton, sjplimp@sandia.gov
Copyright (2003) Sandia Corporation. Under the terms of Contract
DE-AC04-94AL85000 with Sandia Corporation, the U.S. Government retains
certain rights in this software. This software is distributed under
the GNU General Public License.
See the README file in the top-level LAMMPS directory.
------------------------------------------------------------------------- */
#ifdef KSPACE_CLASS
KSpaceStyle(pppm/gpu,PPPMGPU)
#else
#ifndef LMP_PPPM_GPU_H
#define LMP_PPPM_GPU_H
#include "pppm.h"
namespace LAMMPS_NS {
class PPPMGPU : public PPPM {
public:
PPPMGPU(class LAMMPS *, int, char **);
virtual ~PPPMGPU();
virtual void init();
virtual void setup();
virtual void compute(int, int);
virtual void timing(int, double &, double &);
virtual double memory_usage();
protected:
FFT_SCALAR ***density_brick_gpu, ***vd_brick;
bool kspace_split, im_real_space;
virtual void allocate();
virtual void deallocate();
virtual void brick2fft();
virtual void fillbrick();
virtual void poisson(int, int);
double poisson_time;
FFT_SCALAR ***create_3d_offset(int, int, int, int, int, int, const char *,
FFT_SCALAR *, int);
void destroy_3d_offset(FFT_SCALAR ***, int, int);
};
}
#endif
#endif
/* ERROR/WARNING messages:
E: Illegal ... command
Self-explanatory. Check the input script syntax and compare to the
documentation for the command. You can use -echo screen as a
command-line option when running LAMMPS to see the offending line.
E: Cannot use order greater than 8 with pppm/gpu.
Self-explanatory.
E: Out of memory on GPGPU
GPU memory is limited. Reduce the size of the problem or increase the
number of GPUs.
E: Out of range atoms - cannot compute PPPM
One or more atoms are attempting to map their charge to a PPPM grid
point that is not owned by a processor. This is likely for one of two
reasons, both of them bad. First, it may mean that an atom near the
boundary of a processor's sub-domain has moved more than 1/2 the
"neighbor skin distance"_neighbor.html without neighbor lists being
rebuilt and atoms being migrated to new processors. This also means
you may be missing pairwise interactions that need to be computed.
The solution is to change the re-neighboring criteria via the
"neigh_modify"_neigh_modify command. The safest settings are "delay 0
every 1 check yes". Second, it may mean that an atom has moved far
outside a processor's sub-domain or even the entire simulation box.
This indicates bad physics, e.g. due to highly overlapping atoms, too
large a timestep, etc.
*/

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