355 lines
11 KiB
C++
355 lines
11 KiB
C++
/***************************************************************************
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base_atomic.cpp
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-------------------
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W. Michael Brown (ORNL)
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Base class for pair styles with per-particle data for position and type
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__________________________________________________________________________
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This file is part of the LAMMPS Accelerator Library (LAMMPS_AL)
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__________________________________________________________________________
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begin :
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email : brownw@ornl.gov
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***************************************************************************/
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#include "lal_base_atomic.h"
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namespace LAMMPS_AL {
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#define BaseAtomicT BaseAtomic<numtyp, acctyp>
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extern Device<PRECISION,ACC_PRECISION> global_device;
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template <class numtyp, class acctyp>
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BaseAtomicT::BaseAtomic() : _compiled(false), _max_bytes(0), _onetype(0) {
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device=&global_device;
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ans=new Answer<numtyp,acctyp>();
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nbor=new Neighbor();
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pair_program=nullptr;
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ucl_device=nullptr;
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#if defined(LAL_OCL_EV_JIT)
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pair_program_noev=nullptr;
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#endif
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}
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template <class numtyp, class acctyp>
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BaseAtomicT::~BaseAtomic() {
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delete ans;
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delete nbor;
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k_pair_fast.clear();
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k_pair.clear();
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if (pair_program) delete pair_program;
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#if defined(LAL_OCL_EV_JIT)
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k_pair_noev.clear();
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if (pair_program_noev) delete pair_program_noev;
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#endif
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}
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template <class numtyp, class acctyp>
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int BaseAtomicT::bytes_per_atom_atomic(const int max_nbors) const {
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return device->atom.bytes_per_atom()+ans->bytes_per_atom()+
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nbor->bytes_per_atom(max_nbors);
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}
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template <class numtyp, class acctyp>
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int BaseAtomicT::init_atomic(const int nlocal, const int nall,
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const int max_nbors, const int maxspecial,
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const double cell_size, const double gpu_split,
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FILE *_screen, const void *pair_program,
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const char *k_name, const int onetype) {
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screen=_screen;
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int gpu_nbor=0;
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if (device->gpu_mode()==Device<numtyp,acctyp>::GPU_NEIGH)
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gpu_nbor=1;
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else if (device->gpu_mode()==Device<numtyp,acctyp>::GPU_HYB_NEIGH)
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gpu_nbor=2;
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int _gpu_host=0;
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int host_nlocal=hd_balancer.first_host_count(nlocal,gpu_split,gpu_nbor);
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if (host_nlocal>0)
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_gpu_host=1;
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_threads_per_atom=device->threads_per_atom();
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bool charge = false;
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bool rot = false;
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int success=device->init(*ans,charge,rot,nlocal,nall,maxspecial);
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if (success!=0)
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return success;
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if (ucl_device!=device->gpu) _compiled=false;
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ucl_device=device->gpu;
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atom=&device->atom;
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_block_size=device->pair_block_size();
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compile_kernels(*ucl_device,pair_program,k_name,onetype);
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if (_threads_per_atom>1 && gpu_nbor==0) {
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nbor->packing(true);
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_nbor_data=&(nbor->dev_packed);
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} else
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_nbor_data=&(nbor->dev_nbor);
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success = device->init_nbor(nbor,nlocal,host_nlocal,nall,maxspecial,_gpu_host,
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max_nbors,cell_size,false,_threads_per_atom);
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if (success!=0)
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return success;
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// Initialize host-device load balancer
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hd_balancer.init(device,gpu_nbor,gpu_split);
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// Initialize timers for the selected GPU
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time_pair.init(*ucl_device);
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time_pair.zero();
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pos_tex.bind_float(atom->x,4);
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_max_an_bytes=ans->gpu_bytes()+nbor->gpu_bytes();
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return 0;
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}
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template <class numtyp, class acctyp>
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void BaseAtomicT::estimate_gpu_overhead(const int add_kernels) {
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device->estimate_gpu_overhead(1+add_kernels,_gpu_overhead,_driver_overhead);
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}
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template <class numtyp, class acctyp>
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void BaseAtomicT::clear_atomic() {
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// Output any timing information
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acc_timers();
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double avg_split=hd_balancer.all_avg_split();
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_gpu_overhead*=hd_balancer.timestep();
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_driver_overhead*=hd_balancer.timestep();
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device->output_times(time_pair,*ans,*nbor,avg_split,_max_bytes+_max_an_bytes,
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_gpu_overhead,_driver_overhead,_threads_per_atom,screen);
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time_pair.clear();
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hd_balancer.clear();
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nbor->clear();
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ans->clear();
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}
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// ---------------------------------------------------------------------------
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// Copy neighbor list from host
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// ---------------------------------------------------------------------------
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template <class numtyp, class acctyp>
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int * BaseAtomicT::reset_nbors(const int nall, const int inum, int *ilist,
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int *numj, int **firstneigh, bool &success) {
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success=true;
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int mn=nbor->max_nbor_loop(inum,numj,ilist);
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resize_atom(inum,nall,success);
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resize_local(inum,mn,success);
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if (!success)
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return nullptr;
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nbor->get_host(inum,ilist,numj,firstneigh,block_size());
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double bytes=ans->gpu_bytes()+nbor->gpu_bytes();
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if (bytes>_max_an_bytes)
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_max_an_bytes=bytes;
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return ilist;
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}
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// ---------------------------------------------------------------------------
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// Build neighbor list on device
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// ---------------------------------------------------------------------------
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template <class numtyp, class acctyp>
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inline void BaseAtomicT::build_nbor_list(const int inum, const int host_inum,
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const int nall, double **host_x,
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int *host_type, double *sublo,
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double *subhi, tagint *tag,
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int **nspecial, tagint **special,
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bool &success) {
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success=true;
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resize_atom(inum,nall,success);
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resize_local(inum,host_inum,nbor->max_nbors(),success);
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if (!success)
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return;
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atom->cast_copy_x(host_x,host_type);
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int mn;
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nbor->build_nbor_list(host_x, inum, host_inum, nall, *atom, sublo, subhi,
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tag, nspecial, special, success, mn, ans->error_flag);
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double bytes=ans->gpu_bytes()+nbor->gpu_bytes();
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if (bytes>_max_an_bytes)
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_max_an_bytes=bytes;
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}
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// ---------------------------------------------------------------------------
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// Copy nbor list from host if necessary and then calculate forces, virials,..
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// ---------------------------------------------------------------------------
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template <class numtyp, class acctyp>
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void BaseAtomicT::compute(const int f_ago, const int inum_full,
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const int nall, double **host_x, int *host_type,
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int *ilist, int *numj, int **firstneigh,
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const bool eflag_in, const bool vflag_in,
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const bool eatom, const bool vatom,
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int &host_start, const double cpu_time,
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bool &success) {
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acc_timers();
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int eflag, vflag;
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if (eatom) eflag=2;
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else if (eflag_in) eflag=1;
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else eflag=0;
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if (vatom) vflag=2;
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else if (vflag_in) vflag=1;
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else vflag=0;
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#ifdef LAL_NO_BLOCK_REDUCE
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if (eflag) eflag=2;
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if (vflag) vflag=2;
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#endif
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set_kernel(eflag,vflag);
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if (inum_full==0) {
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host_start=0;
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// Make sure textures are correct if realloc by a different hybrid style
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resize_atom(0,nall,success);
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zero_timers();
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return;
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}
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int ago=hd_balancer.ago_first(f_ago);
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int inum=hd_balancer.balance(ago,inum_full,cpu_time);
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ans->inum(inum);
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host_start=inum;
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if (ago==0) {
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reset_nbors(nall, inum, ilist, numj, firstneigh, success);
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if (!success)
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return;
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}
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atom->cast_x_data(host_x,host_type);
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hd_balancer.start_timer();
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atom->add_x_data(host_x,host_type);
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const int red_blocks=loop(eflag,vflag);
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ans->copy_answers(eflag_in,vflag_in,eatom,vatom,ilist,red_blocks);
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device->add_ans_object(ans);
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hd_balancer.stop_timer();
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}
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// ---------------------------------------------------------------------------
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// Reneighbor on GPU if necessary and then compute forces, virials, energies
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// ---------------------------------------------------------------------------
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template <class numtyp, class acctyp>
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int ** BaseAtomicT::compute(const int ago, const int inum_full,
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const int nall, double **host_x, int *host_type,
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double *sublo, double *subhi, tagint *tag,
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int **nspecial, tagint **special,
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const bool eflag_in, const bool vflag_in,
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const bool eatom, const bool vatom,
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int &host_start, int **ilist, int **jnum,
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const double cpu_time, bool &success) {
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acc_timers();
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int eflag, vflag;
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if (eatom) eflag=2;
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else if (eflag_in) eflag=1;
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else eflag=0;
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if (vatom) vflag=2;
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else if (vflag_in) vflag=1;
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else vflag=0;
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#ifdef LAL_NO_BLOCK_REDUCE
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if (eflag) eflag=2;
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if (vflag) vflag=2;
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#endif
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set_kernel(eflag,vflag);
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if (inum_full==0) {
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host_start=0;
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// Make sure textures are correct if realloc by a different hybrid style
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resize_atom(0,nall,success);
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zero_timers();
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return nullptr;
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}
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hd_balancer.balance(cpu_time);
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int inum=hd_balancer.get_gpu_count(ago,inum_full);
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ans->inum(inum);
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host_start=inum;
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// Build neighbor list on GPU if necessary
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if (ago==0) {
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build_nbor_list(inum, inum_full-inum, nall, host_x, host_type,
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sublo, subhi, tag, nspecial, special, success);
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if (!success)
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return nullptr;
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hd_balancer.start_timer();
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} else {
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atom->cast_x_data(host_x,host_type);
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hd_balancer.start_timer();
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atom->add_x_data(host_x,host_type);
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}
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*ilist=nbor->host_ilist.begin();
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*jnum=nbor->host_acc.begin();
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const int red_blocks=loop(eflag,vflag);
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ans->copy_answers(eflag_in,vflag_in,eatom,vatom,red_blocks);
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device->add_ans_object(ans);
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hd_balancer.stop_timer();
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return nbor->host_jlist.begin()-host_start;
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}
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template <class numtyp, class acctyp>
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double BaseAtomicT::host_memory_usage_atomic() const {
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return device->atom.host_memory_usage()+nbor->host_memory_usage()+
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4*sizeof(numtyp)+sizeof(BaseAtomic<numtyp,acctyp>);
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}
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template <class numtyp, class acctyp>
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void BaseAtomicT::compile_kernels(UCL_Device &dev, const void *pair_str,
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const char *kname, const int onetype) {
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if (_compiled && _onetype==onetype)
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return;
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_onetype=onetype;
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std::string s_fast=std::string(kname)+"_fast";
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if (pair_program) delete pair_program;
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pair_program=new UCL_Program(dev);
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std::string oclstring = device->compile_string()+" -DEVFLAG=1";
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if (_onetype) oclstring+=" -DONETYPE="+device->toa(_onetype);
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pair_program->load_string(pair_str,oclstring.c_str(),nullptr,screen);
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k_pair_fast.set_function(*pair_program,s_fast.c_str());
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k_pair.set_function(*pair_program,kname);
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pos_tex.get_texture(*pair_program,"pos_tex");
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#if defined(LAL_OCL_EV_JIT)
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oclstring = device->compile_string()+" -DEVFLAG=0";
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if (_onetype) oclstring+=" -DONETYPE="+device->toa(_onetype);
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if (pair_program_noev) delete pair_program_noev;
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pair_program_noev=new UCL_Program(dev);
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pair_program_noev->load_string(pair_str,oclstring.c_str(),nullptr,screen);
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k_pair_noev.set_function(*pair_program_noev,s_fast.c_str());
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#else
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k_pair_sel = &k_pair_fast;
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#endif
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_compiled=true;
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#if defined(USE_OPENCL) && (defined(CL_VERSION_2_1) || defined(CL_VERSION_3_0))
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if (dev.has_subgroup_support()) {
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size_t mx_subgroup_sz = k_pair_fast.max_subgroup_size(_block_size);
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#if defined(LAL_OCL_EV_JIT)
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mx_subgroup_sz = std::min(mx_subgroup_sz, k_pair_noev.max_subgroup_size(_block_size));
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#endif
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if (_threads_per_atom > mx_subgroup_sz)
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_threads_per_atom = mx_subgroup_sz;
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device->set_simd_size(mx_subgroup_sz);
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}
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#endif
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}
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template class BaseAtomic<PRECISION,ACC_PRECISION>;
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}
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