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sim_control_mpi.h
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sim_control_mpi.h
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/***********************************************************************
simcontrol_mpi.h - Simulation Flow Control MPI parallelized
Christoph Kirst
christoph@nld.ds.mpg.de
Max Planck Institue for Dynamics and Self-Organisation
HU Berlin, BCCN Göttingen & Berlin (2008)
************************************************************************/
#ifndef SIM_CONTROL_MPI_H
#define SIM_CONTROL_MPI_H
#include <sstream>
#include "mpi.h"
#include "expression_parser.h"
#include "sim_io_manager.h"
#include "sim_signals.h"
#include "sim_mpi.h"
#include "sim.h"
//#define SCM_DEBUG(s1, s2) std::cout << "SimControll Parallel DEBUG: " << s1 << " " << s2 << std::endl;
#define SCM_DEBUG(s1,s2)
#ifndef SIM_PRE
#define SIM_PRE "Sim: "
#endif
template<typename KernelT>
class SimControl
{
private:
// parameter
Sim sim;
// parser
ExprParser parser;
// mpi
int mpi_rank, mpi_size;
MPI::Status mpi_status;
public:
SimControl() : sim() {};
int simulate(int argc, char* argv[])
{
MPI::Init(argc, argv);
mpi_rank = MPI::COMM_WORLD.Get_rank();
mpi_size = MPI::COMM_WORLD.Get_size();
if (mpi_rank == SIM_MPI_CNTRL) // process manager
{
SCM_DEBUG("Manager: simulate() ", mpi_rank)
// io
SimIOManager io;
io.init(true, SIM_PRE, true, false, "sim.log");
// check init
std::string err;
bool ready = (mpi_size > 1);
if (!ready) err = "Parallel version requires at least two processes!";
if (ready)
{
ready = !(argc<2);
if (!ready) err = "No input file specified!";
};
if (ready) ready = parser.parse_file(argv[1], err);
SCM_DEBUG("Manager: parser.result=", parser.result)
if (ready) ready = sim.init(parser.result, err);
int n_iterations = sim.n_iterations();
if (!ready)
{
for (int p = 1; p < mpi_size; p++)
sim_send_signal(Exit, -1, p);
io.message(err, Exit);
}
else // if (ready)
{
io.set_iterations(n_iterations);
for (int p = 1; p < mpi_size; p++)
{
sim_send_signal(Success, -1, p);
sim_send_init(n_iterations, p); // initialize working processes
};
}
int src, it, sig;
int done_procs = 0;
int iter = -1;
bool errs = false;
while (ready)
{
SCM_DEBUG("Manager: waiting for signal! iter=", iter)
// wait for next signal
src = MPI::ANY_SOURCE;
sim_recv_signal(sig, it, src);
SCM_DEBUG("Manager: recieved signal (src,it,sig)=(", sig <<","<<it<<","<<src<<")")
SCM_DEBUG("Manager: sig="<<sig, "is_io_signal="<<(is_io_signal(sig)))
if (is_io_signal(sig)) // message or error
{
// recieve a message
std::string str;
sim_recv_message(str, src);
SCM_DEBUG("Manager: Message form: "<<src<<" recived: ", str)
io.message(str, SimSignal(sig), it, src);
// what type of message do we have:
switch (sig)
{
case int(Message):
case int(Warning):
break;
case int(Abort):
sig = int(Success); // to next iteration
errs = true;
break;
case int(Exit):
default:
iter = n_iterations;
sig = int(Success); // propagate iter to abort process
errs = true;
};
}
if (is_io_output_signal(sig))
{
io.set_output_level(SimSignal(sig));
};
if (sig == int(Invalid)) // switch off the invalid process
{
std::string str;
sim_recv_message(str, src);
SCM_DEBUG("Manager: Message form: "<<src<<" it=" << it <<" recived:", str)
io.message(str, Abort);
done_procs++;
errs = true;
}
if (sig == int(Success))
{
SCM_DEBUG("Manager: Process: "<<src <<" job "<<it<<" done! iter=", iter)
iter++;
// start next iteration
if (iter < n_iterations)
{
SCM_DEBUG("Manager: Process: "<<src <<" new job:", iter)
sim_send_do(iter, src);
}
else
{
SCM_DEBUG("Manager: Process: "<<src <<" done! total done=", done_procs)
done_procs++;
};
if (done_procs == mpi_size-1) break;
};
}; // while (ready)
SCM_DEBUG("Manager: all jobs done! done_procs=", done_procs)
// tell all processes to finalize
for (int p = 1; p < mpi_size; p++)
sim_send_do(n_iterations, p);
int final_procs = 0;
while (final_procs < mpi_size -1)
{
sim_recv_finalize(src, MPI::ANY_SOURCE);
SCM_DEBUG("Manager: Process:"<<src<<" is finished! final_procs=", final_procs)
final_procs++;
};
if (ready && !errs)
{
io.message("Simulation done!\n");
io.error_summary();
io.message("Bye!");
}
if (ready && errs)
{
io.message("Simulation done!");
io.error_summary();
io.message("Errors in the simulation!");
}
io.close();
SCM_DEBUG("Manager:", "is finished!")
}
else // working processes
{
SCM_DEBUG("Proc:"<<mpi_rank, "simulate()")
// init
int next_iter = 0;
int iter = -1;
int n_iterations = 0;
int sig, it;
int from = SIM_MPI_CNTRL;
sim_recv_signal(sig, it, from);
bool ready = (sig == int(Success));
if (ready) sim_recv_init(n_iterations, SIM_MPI_CNTRL);
ready = (n_iterations > 0) && !(argc<2);
SCM_DEBUG("Proc:"<<mpi_rank<<" init: n_iters=", n_iterations)
// initialization for manager process ok try if it works for this process
std::string err;
if (ready) ready = parser.parse_file(argv[1], err);
if (ready) ready = sim.init(parser.result, err, mpi_rank);
if (ready)
{
ready = (n_iterations == sim.n_iterations());
if (!ready) err = "Number of iterations dont match!";
};
if(!ready)
{
if (sig == int(Success)) // send invalid mesage if init of root pocess was succesful
{
std::ostringstream str;
str << "Process " << mpi_rank << " invalid: " << err;
sim_send_signal(Invalid, -1, SIM_MPI_CNTRL);
sim_send_message(str.str(), SIM_MPI_CNTRL);
};
}
else
{
sim_send_signal(Success, -1, SIM_MPI_CNTRL); // this process is ready to do work
}
bool succ = true;
while (true)
{
SCM_DEBUG("Proc:"<<mpi_rank<<" iter="<<iter, "waiting for next_iter!")
sim_recv_do(next_iter, SIM_MPI_CNTRL);
SCM_DEBUG("Proc:"<<mpi_rank<<" iter="<<iter<<" recieved next_iter=", next_iter)
if (next_iter >= n_iterations) break; // exit condition
while (iter < next_iter)
{
if (!sim.next_iteration())
{
std::stringstream str;
str << "Process " << mpi_rank << " at it: " << iter;
str << "cannot iterate to next iteration: " << next_iter <<"!";
sim_send_signal(Invalid, -1, SIM_MPI_CNTRL);
sim_send_message(str.str(), SIM_MPI_CNTRL);
succ = false;
};
iter++;
SCM_DEBUG("Proc:"<<mpi_rank<<" iter="<<iter<<" sim.iteration=", sim.iteration())
};
// start simulation at next iteration
SCM_DEBUG("Proc:"<<mpi_rank<<" iter="<<iter, "starting simulation!")
try {
KernelT kernel;
kernel.initialize(sim);
kernel.execute(sim);
kernel.finalize(sim);
}
catch (SimSignal& sig)
{
SCM_DEBUG("Proc:"<<mpi_rank<<" iter="<<iter, "error during sim="<<sig)
// error message is send by sim.signal() already !
succ = false;
};
SCM_DEBUG("Proc:"<<mpi_rank<<" iter="<<iter, "simulation done!")
if (succ) sim_send_signal(Success, iter, SIM_MPI_CNTRL);
else succ = true;
};
SCM_DEBUG("Proc:"<<mpi_rank<<" iter="<<iter, "end iter loop!")
// tell root this process is done!
sim_send_finalize(mpi_rank, SIM_MPI_CNTRL);
}; // end manager - wroking process
MPI::Finalize();
return 0;
};
};
#endif