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// Tpetra: Templated Linear Algebra Services Package
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/// \file Tpetra_Details_gatherPrint.hpp
/// \brief Declaration of a function that prints strings from each process.
///
/// \warning This is an implementation detail of Tpetra. Users may
/// not rely on this header file or any declarations or definitions
/// in it. They may disappear or change at any time.
#ifndef TPETRA_DETAILS_GATHERPRINT_HPP
#define TPETRA_DETAILS_GATHERPRINT_HPP
#include <Tpetra_ConfigDefs.hpp>
#include <Teuchos_Comm.hpp>
#include <string>
#include <ostream>
namespace Tpetra {
namespace Details {
/// \brief On Process 0 in the given communicator, print strings from
/// each process in that communicator, in rank order.
///
/// For each process in the given communicator \c comm, send its
/// string \c s to Process 0 in that communicator. Process 0 prints
/// the strings in rank order.
///
/// This is a collective over the given communicator \c comm. Process
/// 0 promises not to store all the strings in its memory. This
/// function's total memory usage on any process is proportional to
/// the calling process' string length, plus the max string length
/// over any process. This does NOT depend on the number of processes
/// in the communicator. Thus, we call this a "memory-scalable"
/// operation. While the function's name suggests MPI_Gatherv, the
/// implementation may NOT use MPI_Gather or MPI_Gatherv, because
/// neither of those are not memory scalable.
///
/// Process 0 prints nothing other than what is in the string. It
/// does not add an endline after each string, nor does it identify
/// each string with its owning process' rank. If you want either of
/// those in the string, you have to put it there yourself.
///
/// \param out [out] The output stream to which to write. ONLY
/// Process 0 in the given communicator will write to this. Thus,
/// this stream need only be valid on Process 0.
///
/// \param s [in] The string to write. Each process in the given
/// communicator has its own string. Strings may be different on
/// different processes. Zero-length strings are OK.
///
/// \param comm [in] The communicator over which this operation is a
/// collective.
void
gathervPrint (std::ostream& out,
const std::string& s,
const Teuchos::Comm<int>& comm);
} // namespace Details
} // namespace Tpetra
#endif // TPETRA_DETAILS_GATHERPRINT_HPP
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