119 lines
4.1 KiB
C++
119 lines
4.1 KiB
C++
/**********************************************************
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This software is part of J.-S. Caux's ABACUS library.
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Copyright (c) J.-S. Caux.
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-----------------------------------------------------------
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File: Heis_DSF_par.cc
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Purpose: Parallel version of ABACUS using MPICH.
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***********************************************************/
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#include "ABACUS.h"
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#include "mpi.h"
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using namespace ABACUS;
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int main(int argc, char *argv[])
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{
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char whichDSF;
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DP Delta;
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int N, M, iKneeded, iKmin, iKmax, Max_Secs;
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DP target_sumrule = 1.0e+6; // effectively deactivated here
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bool refine;
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if (argc != 8) { // provide some info
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cout << endl << "Welcome to ABACUS\t(copyright J.-S. Caux)." << endl;
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cout << endl << "Usage of Heis_DSF_par executable: " << endl;
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cout << endl << "This function runs ABACUS in parallel mode, starting from a preexisting serial run (obtained using the Heis_DSF executable) using the same model parameters." << endl;
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cout << endl << "Provide the following arguments:" << endl << endl;
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cout << "char whichDSF \t\t Which structure factor should be calculated ? Options are: m for S- S+, z for Sz Sz, p for S+ S-." << endl;
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cout << "DP Delta \t\t Value of the anisotropy: use positive real values only" << endl;
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cout << "int N \t\t\t Length (number of sites) of the system: use positive even integer values only" << endl;
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cout << "int M \t\t\t Number of down spins: use positive integer values between 1 and N/2" << endl;
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cout << "int iKmin" << endl << "int iKmax \t\t Min and max momentum integers to scan over: recommended values: 0 and N" << endl;
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cout << "int Max_Secs \t\t Allowed computational time: (in seconds)" << endl;
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cout << endl << "EXAMPLE: " << endl << endl;
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cout << "mpiexec -np 8 Heis_DSF_par z 1.0 100 40 0 100 600" << endl << endl;
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return(0);
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}
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else { // (argc == 8) correct nr of arguments
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whichDSF = *argv[1];
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Delta = atof(argv[2]);
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N = atoi(argv[3]);
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M = atoi(argv[4]);
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iKmin = atoi(argv[5]);
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iKmax = atoi(argv[6]);
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Max_Secs = atoi(argv[7]);
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}
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DP supercycle_time = 600.0; // allotted time per supercycle
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if (Max_Secs <= supercycle_time + 300) ABACUSerror("Please allow more time in Heis_DSF_par.");
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MPI::Init(argc, argv);
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DP tstart = MPI::Wtime();
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int rank = MPI::COMM_WORLD.Get_rank();
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int nr_processors = MPI::COMM_WORLD.Get_size();
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if (nr_processors < 2) ABACUSerror("Give at least 2 processors to ABACUS parallel !");
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refine = true;
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// ASSUMPTION: preexisting files (raw, thr, ...) exist for the run.
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// IMPORTANT PRECONDITION: no flags are being raised in General_Scan in parallel mode, so
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// the preinitializing serial run must be extensive enough to have flagged all base/type s necessary.
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DP tnow = MPI::Wtime();
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while (tnow - tstart < Max_Secs - supercycle_time - 300) { // space for one more supercycle, + 5 minutes safety
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//cout << "rank " << rank << " ready to prepare." << endl;
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if (rank == 0)
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// Split up thread list into chunks, one per processor
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Prepare_Parallel_Scan_Heis (whichDSF, Delta, N, M, iKmin, iKmax, nr_processors);
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//cout << "rank " << rank << " done preparing, ready to scan." << endl;
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// Barrier synchronization, to make sure other processes wait for process of rank 0
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// to have finished splitting up the thr file into pieces before starting:
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MPI_Barrier (MPI::COMM_WORLD);
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// then everybody gets going on their own chunk !
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Scan_Heis (whichDSF, Delta, N, M, iKmin, iKmax,
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supercycle_time, target_sumrule, refine, rank, nr_processors);
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//cout << "rank " << rank << " finished scanning, reached wrapup stage." << endl;
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// Another barrier synchronization
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MPI_Barrier (MPI::COMM_WORLD);
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// Now that everybody is done, digest data into unique files
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if (rank == 0)
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Wrapup_Parallel_Scan_Heis (whichDSF, Delta, N, M, iKmin, iKmax, nr_processors);
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//cout << "rank " << rank << " passed wrapup stage." << endl;
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// Another barrier synchronization
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MPI_Barrier (MPI::COMM_WORLD);
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tnow = MPI::Wtime();
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} // while (tnow - tstart...
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MPI::Finalize();
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return(0);
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}
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