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- /**********************************************************
-
- This software is part of J.-S. Caux's ABACUS library.
-
- Copyright (c) J.-S. Caux.
-
- -----------------------------------------------------------
-
- File: LiebLin_DSF_par.cc
-
- Purpose: Parallel version of ABACUS using MPICH.
-
- ***********************************************************/
-
- #include "ABACUS.h"
- #include "mpi.h"
-
- using namespace ABACUS;
-
- int main(int argc, char *argv[])
- {
- char whichDSF;
- DP c_int, L;
- int N, Nl, DIl, DIr, iKmin, iKmax, Max_Secs, supercycle_time;
- DP target_sumrule = 1.0e+6; // effectively deactivated here
- bool refine = true; // always true for parallel mode
-
- DP kBT = 0.0; // dummy
-
- if (argc != 12) { // provide some info
-
- cout << endl << "Welcome to ABACUS\t(copyright J.-S. Caux)." << endl;
- cout << endl << "Usage of LiebLin_DSF_MosesState_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 << "int Nl \t\t\t Number of particles in left Fermi sea (Nr is then N - Nl)" << endl;
- cout << "int DIl \t\t shift of left sea as compared to its ground state position" << endl;
- cout << "int DIr \t\t shift of right sea as compared to its ground state position" << 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 Max_Secs \t\t Allowed computational time: (in seconds)" << endl;
- cout << "int supercycle_time \t\t time for one supercycle (in seconds)" << endl;
- cout << endl << "EXAMPLE: " << endl << endl;
- cout << "mpiexec -np 8 LiebLin_DSF_MosesState_par d 1.0 100.0 100 50 -30 20 -400 400 3600 600" << endl << endl;
-
- return(0);
- }
-
- else { // (argc == 11) correct nr of arguments
- whichDSF = *argv[1];
- c_int = atof(argv[2]);
- L = atof(argv[3]);
- N = atoi(argv[4]);
- Nl = atoi(argv[5]);
- DIl = atoi(argv[6]);
- DIr = atoi(argv[7]);
- iKmin = atoi(argv[8]);
- iKmax = atoi(argv[9]);
- Max_Secs = atoi(argv[10]);
- supercycle_time = atoi(argv[11]);
- }
-
- if (Max_Secs <= supercycle_time) ABACUSerror("Please allow more time in LiebLin_DSF_par.");
-
- MPI::Init(argc, argv);
-
- DP tstart = MPI::Wtime();
-
- int rank = MPI::COMM_WORLD.Get_rank();
- int nr_processors = MPI::COMM_WORLD.Get_size();
-
- if (nr_processors < 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();
-
- // Define the Moses state:
- LiebLin_Bethe_State MosesState (c_int, L, N);
-
- // Split the sea:
- for (int i = 0; i < Nl; ++i) MosesState.Ix2[i] += 2 * DIl;
- for (int i = Nl; i < N; ++i) MosesState.Ix2[i] += 2 * DIr;
-
- MosesState.Compute_All (true);
-
- // Handy default name:
- stringstream defaultScanStatename_strstream;
- defaultScanStatename_strstream << "Moses_Nl_" << Nl << "_DIl_" << DIl << "_DIr_" << DIr;
- string defaultScanStatename = defaultScanStatename_strstream.str();
-
- MPI_Barrier (MPI::COMM_WORLD);
-
- while (tnow - tstart < Max_Secs - supercycle_time - 120) { // space for one more supercycle, + 2 minutes safety
-
- if (rank == 0)
- // Split up thread list into chunks, one per processor
- Prepare_Parallel_Scan_LiebLin (whichDSF, c_int, L, N, iKmin, iKmax, kBT, defaultScanStatename, nr_processors);
-
- // Barrier synchronization, to make sure other processes wait for process of rank 0
- // to have finished splitting up the thr file into pieces before starting:
- MPI_Barrier (MPI::COMM_WORLD);
-
- // then everybody gets going on their own chunk !
- Scan_LiebLin (whichDSF, MosesState, defaultScanStatename, iKmin, iKmax, supercycle_time,
- target_sumrule, refine, rank, nr_processors);
-
- // Another barrier synchronization
- MPI_Barrier (MPI::COMM_WORLD);
-
- // Now that everybody is done, digest data into unique files
-
- if (rank == 0)
- Wrapup_Parallel_Scan_LiebLin (whichDSF, c_int, L, N, iKmin, iKmax, kBT, defaultScanStatename, nr_processors);
-
- // Another barrier synchronization
- MPI_Barrier (MPI::COMM_WORLD);
-
- tnow = MPI::Wtime();
-
- } // while (tnow - tstart...
-
- MPI::Finalize();
-
- return(0);
- }
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