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128 lines
4.1 KiB
C++
128 lines
4.1 KiB
C++
/*************************************************************************************
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Grid physics library, www.github.com/paboyle/Grid
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Source file: ./lib/communicator/SharedMemory.cc
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Copyright (C) 2015
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Author: Peter Boyle <paboyle@ph.ed.ac.uk>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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See the full license in the file "LICENSE" in the top level distribution directory
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*************************************************************************************/
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/* END LEGAL */
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#include <Grid/GridCore.h>
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NAMESPACE_BEGIN(Grid);
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/*Construct from an MPI communicator*/
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void GlobalSharedMemory::Init(Grid_MPI_Comm comm)
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{
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assert(_ShmSetup==0);
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WorldComm = 0;
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WorldRank = 0;
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WorldSize = 1;
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WorldShmComm = 0 ;
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WorldShmRank = 0 ;
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WorldShmSize = 1 ;
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WorldNodes = 1 ;
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WorldNode = 0 ;
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WorldShmRanks.resize(WorldSize); WorldShmRanks[0] = 0;
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WorldShmCommBufs.resize(1);
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_ShmSetup=1;
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}
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void GlobalSharedMemory::OptimalCommunicator(const std::vector<int> &processors,Grid_MPI_Comm & optimal_comm)
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{
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optimal_comm = WorldComm;
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}
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////////////////////////////////////////////////////////////////////////////////////////////
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// Hugetlbfs mapping intended, use anonymous mmap
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////////////////////////////////////////////////////////////////////////////////////////////
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void GlobalSharedMemory::SharedMemoryAllocate(uint64_t bytes, int flags)
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{
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void * ShmCommBuf ;
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assert(_ShmSetup==1);
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assert(_ShmAlloc==0);
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int mmap_flag =0;
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#ifdef MAP_ANONYMOUS
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mmap_flag = mmap_flag| MAP_SHARED | MAP_ANONYMOUS;
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#endif
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#ifdef MAP_ANON
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mmap_flag = mmap_flag| MAP_SHARED | MAP_ANON;
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#endif
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#ifdef MAP_HUGETLB
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if ( flags ) mmap_flag |= MAP_HUGETLB;
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#endif
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ShmCommBuf =(void *) mmap(NULL, bytes, PROT_READ | PROT_WRITE, mmap_flag, -1, 0);
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if (ShmCommBuf == (void *)MAP_FAILED) {
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perror("mmap failed ");
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exit(EXIT_FAILURE);
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}
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#ifdef MADV_HUGEPAGE
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if (!Hugepages ) madvise(ShmCommBuf,bytes,MADV_HUGEPAGE);
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#endif
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bzero(ShmCommBuf,bytes);
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WorldShmCommBufs[0] = ShmCommBuf;
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_ShmAllocBytes=bytes;
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_ShmAlloc=1;
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};
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////////////////////////////////////////////////////////
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// Global shared functionality finished
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// Now move to per communicator functionality
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////////////////////////////////////////////////////////
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void SharedMemory::SetCommunicator(Grid_MPI_Comm comm)
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{
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assert(GlobalSharedMemory::ShmAlloc()==1);
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ShmRanks.resize(1);
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ShmCommBufs.resize(1);
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ShmRanks[0] = 0;
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ShmRank = 0;
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ShmSize = 1;
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//////////////////////////////////////////////////////////////////////
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// Map ShmRank to WorldShmRank and use the right buffer
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//////////////////////////////////////////////////////////////////////
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ShmCommBufs[0] = GlobalSharedMemory::WorldShmCommBufs[0];
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heap_size = GlobalSharedMemory::ShmAllocBytes();
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ShmBufferFreeAll();
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return;
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}
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//////////////////////////////////////////////////////////////////
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// On node barrier
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//////////////////////////////////////////////////////////////////
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void SharedMemory::ShmBarrier(void){ return ; }
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//////////////////////////////////////////////////////////////////////////////////////////////////////////
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// Test the shared memory is working
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//////////////////////////////////////////////////////////////////////////////////////////////////////////
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void SharedMemory::SharedMemoryTest(void) { return; }
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void *SharedMemory::ShmBuffer(int rank)
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{
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return NULL;
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}
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void *SharedMemory::ShmBufferTranslate(int rank,void * local_p)
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{
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return NULL;
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}
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NAMESPACE_END(Grid);
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