Allow resize of the shared memory buffers

TODO

@@ -1,16 +1,32 @@
 TODO:
 ---------------
 
-Large item work list:
+Code item work list
+
+a) namespaces & indentation
+ GRID_BEGIN_NAMESPACE();
+ GRID_END_NAMESPACE();
+-- delete QCD namespace
+
+b) GPU branch
+- start branch
+- Increase Macro use in core library support; prepare for change
+- Audit volume of "device" code
+- Virtual function audit
+- Start port once Nvidia box is up
+- Cut down volume of code for first port? How?
+
+Physics item work list:
 
 1)- BG/Q port and check ; Andrew says ok.
-3a)- RNG I/O in ILDG/SciDAC (minor)
+2)- Consistent linear solver flop count/rate -- PARTIAL, time but no flop/s yet
-3c)- Consistent linear solver flop count/rate -- PARTIAL, time but no flop/s yet
+3)- Physical propagator interface
-4)- Physical propagator interface
+4)- Multigrid Wilson and DWF, compare to other Multigrid implementations
-6)- Multigrid Wilson and DWF, compare to other Multigrid implementations
+5)- HDCR resume
-7)- HDCR resume
+
 ----------------------------
 Recent DONE 
+-- RNG I/O in ILDG/SciDAC (minor) 
 -- Precision conversion and sort out localConvert      <-- partial/easy
 -- Conserved currents (Andrew)
 -- Split grid

lib/communicator/SharedMemory.cc

@@ -34,7 +34,9 @@ namespace Grid {
 
 uint64_t            GlobalSharedMemory::MAX_MPI_SHM_BYTES   = 1024LL*1024LL*1024LL; 
 int                 GlobalSharedMemory::Hugepages = 0;
-int                 GlobalSharedMemory::ShmSetup;
+int                 GlobalSharedMemory::_ShmSetup;
+int                 GlobalSharedMemory::_ShmAlloc;
+uint64_t            GlobalSharedMemory::_ShmAllocBytes;
 
 std::vector<void *> GlobalSharedMemory::WorldShmCommBufs;
 
@@ -50,5 +52,41 @@ int                 GlobalSharedMemory::WorldRank;
 int                 GlobalSharedMemory::WorldNodes;
 int                 GlobalSharedMemory::WorldNode;
 
+void GlobalSharedMemory::SharedMemoryFree(void)
+{
+  assert(_ShmAlloc);
+  assert(_ShmAllocBytes>0);
+  for(int r=0;r<WorldShmSize;r++){
+    munmap(WorldShmCommBufs[r],_ShmAllocBytes);
+  }
+  _ShmAlloc = 0;
+  _ShmAllocBytes = 0;
+}
+/////////////////////////////////
+// Alloc, free shmem region
+/////////////////////////////////
+void *SharedMemory::ShmBufferMalloc(size_t bytes){
+  //  bytes = (bytes+sizeof(vRealD))&(~(sizeof(vRealD)-1));// align up bytes
+  void *ptr = (void *)heap_top;
+  heap_top  += bytes;
+  heap_bytes+= bytes;
+  if (heap_bytes >= heap_size) {
+    std::cout<< " ShmBufferMalloc exceeded shared heap size -- try increasing with --shm <MB> flag" <<std::endl;
+    std::cout<< " Parameter specified in units of MB (megabytes) " <<std::endl;
+    std::cout<< " Current value is " << (heap_size/(1024*1024)) <<std::endl;
+    assert(heap_bytes<heap_size);
+  }
+  return ptr;
+}
+void SharedMemory::ShmBufferFreeAll(void) { 
+  heap_top  =(size_t)ShmBufferSelf();
+  heap_bytes=0;
+}
+void *SharedMemory::ShmBufferSelf(void)
+{
+  return ShmCommBufs[ShmRank];
+}
+
+
 
 }

lib/communicator/SharedMemory.h

@@ -69,11 +69,17 @@ namespace Grid {
 
 class GlobalSharedMemory {
  private:
-  // Init once lock on the buffer allocation
-  static int ShmSetup;
   static const int     MAXLOG2RANKSPERNODE = 16;            
 
+  // Init once lock on the buffer allocation
+  static int      _ShmSetup;
+  static int      _ShmAlloc;
+  static uint64_t _ShmAllocBytes;
+
  public:
+  static int      ShmSetup(void)      { return _ShmSetup; }
+  static int      ShmAlloc(void)      { return _ShmAlloc; }
+  static uint64_t ShmAllocBytes(void) { return _ShmAllocBytes; }
   static uint64_t      MAX_MPI_SHM_BYTES;
   static int           Hugepages;
 

lib/communicator/SharedMemoryMPI.cc

@@ -33,6 +33,7 @@ namespace Grid {
 /*Construct from an MPI communicator*/
 void GlobalSharedMemory::Init(Grid_MPI_Comm comm)
 {
+  assert(_ShmSetup==0);
   WorldComm = comm;
   MPI_Comm_rank(WorldComm,&WorldRank);
   MPI_Comm_size(WorldComm,&WorldSize);
@@ -110,6 +111,7 @@ void GlobalSharedMemory::Init(Grid_MPI_Comm comm)
     }
   }
   assert(WorldNode!=-1);
+  _ShmSetup=1;
 }
 
 void GlobalSharedMemory::OptimalCommunicator(const std::vector<int> &processors,Grid_MPI_Comm & optimal_comm)
@@ -180,8 +182,8 @@ void GlobalSharedMemory::OptimalCommunicator(const std::vector<int> &processors,
 #ifdef GRID_MPI3_SHMMMAP
 void GlobalSharedMemory::SharedMemoryAllocate(uint64_t bytes, int flags)
 {
-  GlobalSharedMemory::MAX_MPI_SHM_BYTES  = bytes;
+  assert(_ShmSetup==1);
-  assert(ShmSetup==0); ShmSetup=1;
+  assert(_ShmAlloc==0);
   //////////////////////////////////////////////////////////////////////////////////////////////////////////
   // allocate the shared windows for our group
   //////////////////////////////////////////////////////////////////////////////////////////////////////////
@@ -214,8 +216,11 @@ void GlobalSharedMemory::SharedMemoryAllocate(uint64_t bytes, int flags)
       perror("failed mmap");      assert(0);    
     }
     assert(((uint64_t)ptr&0x3F)==0);
+    close(fd);
     WorldShmCommBufs[r] =ptr;
   }
+  _ShmAlloc=1;
+  _ShmAllocBytes  = bytes;
 };
 #endif // MMAP
 
@@ -227,8 +232,8 @@ void GlobalSharedMemory::SharedMemoryAllocate(uint64_t bytes, int flags)
 ////////////////////////////////////////////////////////////////////////////////////////////
 void GlobalSharedMemory::SharedMemoryAllocate(uint64_t bytes, int flags)
 { 
-  GlobalSharedMemory::MAX_MPI_SHM_BYTES  = bytes;
+  assert(_ShmSetup==1);
-  assert(ShmSetup==0); ShmSetup=1;
+  assert(_ShmAlloc==0); 
   MPI_Barrier(WorldShmComm);
   WorldShmCommBufs.resize(WorldShmSize);
 
@@ -258,6 +263,7 @@ void GlobalSharedMemory::SharedMemoryAllocate(uint64_t bytes, int flags)
       assert(((uint64_t)ptr&0x3F)==0);
       
       WorldShmCommBufs[r] =ptr;
+      close(fd);
     }
   }
 
@@ -277,17 +283,15 @@ void GlobalSharedMemory::SharedMemoryAllocate(uint64_t bytes, int flags)
       if ( ptr == MAP_FAILED ) {       perror("failed mmap");      assert(0);    }
       assert(((uint64_t)ptr&0x3F)==0);
       WorldShmCommBufs[r] =ptr;
+
+      close(fd);
     }
   }
+  _ShmAlloc=1;
+  _ShmAllocBytes = bytes;
 }
 #endif
 
-void GlobalSharedMemory::SharedMemoryFree(void)
-{
-  assert(ShmSetup);
-  assert(0); // unimplemented
-}
-
   ////////////////////////////////////////////////////////
   // Global shared functionality finished
   // Now move to per communicator functionality
@@ -310,7 +314,8 @@ void SharedMemory::SetCommunicator(Grid_MPI_Comm comm)
   //////////////////////////////////////////////////////////////////////
   // Map ShmRank to WorldShmRank and use the right buffer
   //////////////////////////////////////////////////////////////////////
-  heap_size = GlobalSharedMemory::MAX_MPI_SHM_BYTES;
+  assert (GlobalSharedMemory::ShmAlloc()==1);
+  heap_size = GlobalSharedMemory::ShmAllocBytes();
   for(int r=0;r<ShmSize;r++){
 
     uint32_t sr = (r==ShmRank) ? GlobalSharedMemory::WorldRank : 0 ;
@@ -364,10 +369,6 @@ void SharedMemory::SharedMemoryTest(void)
   ShmBarrier();
 }
 
-void *SharedMemory::ShmBufferSelf(void)
-{
-  return ShmCommBufs[ShmRank];
-}
 void *SharedMemory::ShmBuffer(int rank)
 {
   int gpeer = ShmRanks[rank];
@@ -391,25 +392,4 @@ void *SharedMemory::ShmBufferTranslate(int rank,void * local_p)
   }
 }
 
-/////////////////////////////////
-// Alloc, free shmem region
-/////////////////////////////////
-void *SharedMemory::ShmBufferMalloc(size_t bytes){
-  //  bytes = (bytes+sizeof(vRealD))&(~(sizeof(vRealD)-1));// align up bytes
-  void *ptr = (void *)heap_top;
-  heap_top  += bytes;
-  heap_bytes+= bytes;
-  if (heap_bytes >= heap_size) {
-    std::cout<< " ShmBufferMalloc exceeded shared heap size -- try increasing with --shm <MB> flag" <<std::endl;
-    std::cout<< " Parameter specified in units of MB (megabytes) " <<std::endl;
-    std::cout<< " Current value is " << (heap_size/(1024*1024)) <<std::endl;
-    assert(heap_bytes<heap_size);
-  }
-  return ptr;
-}
-void SharedMemory::ShmBufferFreeAll(void) { 
-  heap_top  =(size_t)ShmBufferSelf();
-  heap_bytes=0;
-}
-
 }

lib/communicator/SharedMemoryNone.cc

@@ -33,6 +33,7 @@ namespace Grid {
 /*Construct from an MPI communicator*/
 void GlobalSharedMemory::Init(Grid_MPI_Comm comm)
 {
+  assert(_ShmSetup==0);
   WorldComm = 0;
   WorldRank = 0;
   WorldSize = 1;
@@ -43,6 +44,7 @@ void GlobalSharedMemory::Init(Grid_MPI_Comm comm)
   WorldNode    = 0 ;
   WorldShmRanks.resize(WorldSize); WorldShmRanks[0] = 0;
   WorldShmCommBufs.resize(1);
+  _ShmSetup=1;
 }
 
 void GlobalSharedMemory::OptimalCommunicator(const std::vector<int> &processors,Grid_MPI_Comm & optimal_comm)
@@ -56,7 +58,8 @@ void GlobalSharedMemory::OptimalCommunicator(const std::vector<int> &processors,
 void GlobalSharedMemory::SharedMemoryAllocate(uint64_t bytes, int flags)
 {
   void * ShmCommBuf ; 
-  MAX_MPI_SHM_BYTES=bytes;
+  assert(_ShmSetup==1);
+  assert(_ShmAlloc==0);
   int mmap_flag =0;
 #ifdef MAP_ANONYMOUS
   mmap_flag = mmap_flag| MAP_SHARED | MAP_ANONYMOUS;
@@ -77,20 +80,17 @@ void GlobalSharedMemory::SharedMemoryAllocate(uint64_t bytes, int flags)
 #endif
   bzero(ShmCommBuf,bytes);
   WorldShmCommBufs[0] = ShmCommBuf;
+  _ShmAllocBytes=bytes;
+  _ShmAlloc=1;
 };
 
-void GlobalSharedMemory::SharedMemoryFree(void)
-{
-  assert(ShmSetup);
-  assert(0); // unimplemented
-}
-
   ////////////////////////////////////////////////////////
   // Global shared functionality finished
   // Now move to per communicator functionality
   ////////////////////////////////////////////////////////
 void SharedMemory::SetCommunicator(Grid_MPI_Comm comm)
 {
+  assert(GlobalSharedMemory::ShmAlloc()==1);
   ShmRanks.resize(1);
   ShmCommBufs.resize(1);
   ShmRanks[0] = 0;
@@ -100,7 +100,7 @@ void SharedMemory::SetCommunicator(Grid_MPI_Comm comm)
   // Map ShmRank to WorldShmRank and use the right buffer
   //////////////////////////////////////////////////////////////////////
   ShmCommBufs[0] = GlobalSharedMemory::WorldShmCommBufs[0];
-  heap_size      = GlobalSharedMemory::MAX_MPI_SHM_BYTES;
+  heap_size      = GlobalSharedMemory::ShmAllocBytes();
   ShmBufferFreeAll();
   return;
 }
@@ -114,10 +114,6 @@ void SharedMemory::ShmBarrier(void){ return ; }
 //////////////////////////////////////////////////////////////////////////////////////////////////////////
 void SharedMemory::SharedMemoryTest(void) { return; }
 
-void *SharedMemory::ShmBufferSelf(void)
-{
-  return ShmCommBufs[ShmRank];
-}
 void *SharedMemory::ShmBuffer(int rank)
 {
   return NULL;
@@ -127,24 +123,4 @@ void *SharedMemory::ShmBufferTranslate(int rank,void * local_p)
   return NULL;
 }
 
-/////////////////////////////////
-// Alloc, free shmem region ; common to MPI and none?
-/////////////////////////////////
-void *SharedMemory::ShmBufferMalloc(size_t bytes){
-  void *ptr = (void *)heap_top;
-  heap_top  += bytes;
-  heap_bytes+= bytes;
-  if (heap_bytes >= heap_size) {
-    std::cout<< " ShmBufferMalloc exceeded shared heap size -- try increasing with --shm <MB> flag" <<std::endl;
-    std::cout<< " Parameter specified in units of MB (megabytes) " <<std::endl;
-    std::cout<< " Current value is " << (heap_size/(1024*1024)) <<std::endl;
-    assert(heap_bytes<heap_size);
-  }
-  return ptr;
-}
-void SharedMemory::ShmBufferFreeAll(void) { 
-  heap_top  =(size_t)ShmBufferSelf();
-  heap_bytes=0;
-}
-
 }