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- /**********************************************************
-
- This software is part of J.-S. Caux's ABACUS library.
-
- Copyright (c) J.-S. Caux.
-
- -----------------------------------------------------------
-
- File: LiebLin_DSF_GeneralState_par_Run.cc
-
- Purpose: Parallel version of ABACUS using MPICH.
-
- ***********************************************************/
-
- #include "ABACUS.h"
- #include "mpi.h"
-
- using namespace std;
- using namespace ABACUS;
-
- int main(int argc, char *argv[])
- {
- char whichDSF;
- DP c_int, L, kBT;
- int N, iKmin, iKmax, Max_Secs, paralevel;
- DP target_sumrule = 1.0e+6; // effectively deactivated here
- bool refine = true; // always true for parallel mode
- char* Ix2filenameprefix;
-
- if (argc < 10) { // provide some info
-
- cout << endl << "Welcome to ABACUS\t(copyright J.-S. Caux)." << endl;
- cout << endl << "Usage of LiebLin_DSF_par executable: " << endl;
- cout << endl << "This function runs ABACUS in parallel mode, starting from a preexisting "
- "serial run (obtained using the LiebLin_DSF executable) using the same model parameters." << endl;
- cout << endl << "Provide the following arguments:" << endl << endl;
- cout << "char whichDSF \t\t Which structure factor should be calculated ? Options are: "
- "d for rho rho, g for psi psi{dagger}, o for psi{dagger} psi" << endl;
- cout << "DP c_int \t\t Value of the interaction parameter: use positive real values only" << endl;
- cout << "DP L \t\t\t Length of the system: use positive real values only" << endl;
- cout << "int N \t\t\t Number of particles: use positive integer values only" << endl;
- cout << "char* defaultScanStatename:\t\t file [].Ix2 contains the quantum numbers defining the "
- "AveragingState; used as defaultScanStatename" << endl;
- cout << "int iKmin" << endl << "int iKmax \t\t Min and max momentum integers to scan over: "
- "recommended values: -2*N and 2*N" << endl;
- cout << "int paralevel" << endl;
- cout << "rank[i], nr_processors[i] \t rank and nr_processors of each earlier paralevels." << endl;
- cout << "int Max_Secs \t\t Allowed computational time: (in seconds)" << endl;
-
- return(0);
- }
-
- int n = 1;
- whichDSF = *argv[n++];
- c_int = atof(argv[n++]);
- L = atof(argv[n++]);
- N = atoi(argv[n++]);
- Ix2filenameprefix = argv[n++];
- iKmin = atoi(argv[n++]);
- iKmax = atoi(argv[n++]);
- paralevel = atoi(argv[n++]); // paralevel == 1 means that we have one layer of parallelization, so no previous rank and nr_processors to specify
- if (argc != 10 + 2*(paralevel - 1)) ABACUSerror("Wrong nr of arguments in LiebLin_DSF_par_Prepare.");
- Vect<int> rank_lower_paralevels(paralevel - 1);
- Vect<int> nr_processors_lower_paralevels(paralevel - 1);
- for (int i = 0; i < paralevel - 1; ++i) {
- rank_lower_paralevels[i] = atoi(argv[n++]);
- nr_processors_lower_paralevels[i] = atoi(argv[n++]);
- }
- Max_Secs = atoi(argv[n++]);
-
- if (Max_Secs <= 120) ABACUSerror("Please allow more time in LiebLin_DSF_par_Run.");
-
- int Max_Secs_used = Max_Secs - 120;
-
- MPI::Init(argc, argv);
-
- DP tstart = MPI::Wtime();
-
- int rank_here = MPI::COMM_WORLD.Get_rank();
- int nr_processors_here = MPI::COMM_WORLD.Get_size();
-
- // Read the Ix2 from the file:
- Vect<int> Ix2_input(N);
- ifstream Ix2_input_file;
- stringstream filenamestrstream;
- filenamestrstream << Ix2filenameprefix;
- string defaultScanStatename = filenamestrstream.str();
- filenamestrstream << ".Ix2";
- string filenamestr = filenamestrstream.str();
- const char* filename_Cstr = filenamestr.c_str();
- Ix2_input_file.open(filename_Cstr);
- if (Ix2_input_file.fail()) {
- cout << filename_Cstr << endl;
- ABACUSerror("Could not open Ix2 input file in LiebLin_DSF_GeneralState");
- }
- for (int i = 0; i < N; ++i) {
- Ix2_input_file >> Ix2_input[i];
- }
-
- // Now define the AveragingState
- LiebLin_Bethe_State AveragingState(c_int, L, N);
- AveragingState.Ix2 = Ix2_input;
- AveragingState.Compute_All(true);
-
-
- Vect<int> rank (paralevel);
- Vect<int> nr_processors (paralevel);
- for (int i = 0; i < paralevel - 1; ++i) {
- rank[i] = rank_lower_paralevels[i];
- nr_processors[i] = nr_processors_lower_paralevels[i];
- }
- rank[paralevel-1] = rank_here;
- nr_processors[paralevel-1] = nr_processors_here;
-
- if (nr_processors_here < 2) ABACUSerror("Give at least 2 processors to ABACUS parallel !");
-
- refine = true;
-
- // ASSUMPTION: preexisting files (raw, thr, ...) exist for the run.
-
-
- DP tnow = MPI::Wtime();
-
-
- if (Max_Secs_used > 0) {
-
- // Barrier synchronization
- MPI_Barrier (MPI::COMM_WORLD);
-
- // then everybody gets going on their own chunk !
- Scan_LiebLin (whichDSF, AveragingState, defaultScanStatename, iKmin, iKmax, Max_Secs,
- target_sumrule, refine, paralevel, rank, nr_processors);
-
- // Another barrier synchronization
- MPI_Barrier (MPI::COMM_WORLD);
-
- tnow = MPI::Wtime();
-
- } // while (tnow - tstart...
-
- MPI::Finalize();
-
- return(0);
- }
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