Hi All,
I am working on some parallelism with Communicator. But I don't understand
exactly the syntax of _communicator.send and _communicator.receive. This is
the definition of send for sending a vector in parallel_implementation.h.
*template <typename T>*
*inline void Communicator::send (const unsigned int dest_processor_id,*
* std::vector<T> &buf,*
* const DataType &type,*
* Request &req,*
* const MessageTag &tag) const*
*{*
* START_LOG("send()", "Parallel");*
*#ifndef NDEBUG*
* // Only catch the return value when asserts are active.*
* const int ierr =*
*#endif*
* ((this->send_mode() == SYNCHRONOUS) ?*
* MPI_Issend : MPI_Isend) (buf.empty() ? NULL : &buf[0],*
* cast_int<int>(buf.size()),*
* type,*
* dest_processor_id,*
* tag.value(),*
* this->get(),*
* req.get());*
* libmesh_assert (ierr == MPI_SUCCESS);*
* STOP_LOG("send()", "Parallel");*
*}*
Suppose I want to send a vector<double> from processor 0 to processor 1. I
tried the following:
if (_communicator.rank() == 0)
{
std::vector<double> sender;
sender.push_back(1.1);
sender.push_back(2.2);
Request & req;
* _communicator.send(1, &sender, MPI::DOUBLE, req, 10.231);*
}
else if (_communicator.rank() == 1)
{
std::vector<double> receiver(2);
Request & req;
* _communicator.receive(0, &receiver, MPI::DOUBLE, req, 10.231);*
}
I encountered the compilation errors as follows. Does anyone know how to
setup the correct syntax for this case?
*'Request' was not declared in this scope'MPI' has not been declared*
Thank you very much,
Lei
-------------------------------------------------------------------
Lei Zhao
Research Assistant
University of Wisconsin-Madison
206 Materials Science & Engineering
1509 University Avenue
Madison, WI 53706, US
Email: lzha...@wisc.edu
Tel.: (608)332-8385
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