NAME

       sc::MTMPIMemoryGrp - This MemoryGrp class requires a MT-safe MPI implementation.

SYNOPSIS

       #include <memmtmpi.h>

       Inherits sc::ActiveMsgMemoryGrp.

   Public Member Functions
       MTMPIMemoryGrp (const Ref< MessageGrp > &msg, const Ref< ThreadGrp > &th, MPI_Comm
           comm=MPI_COMM_WORLD)
           Construct a MTMPIMemoryGrp given a MessageGrp, ThreadGrp, and an MPI communicator.
       MTMPIMemoryGrp (const Ref< KeyVal > &)
           Construct a MTMPIMemoryGrp given a KeyVal input object.
       void activate ()
           Activate is called before the memory is to be used.
       void deactivate ()
           Deactivate is called after the memory has been used.
       void sync ()
           Synchronizes all the nodes.

       Public Member Functions inherited from sc::ActiveMsgMemoryGrp
       ActiveMsgMemoryGrp (const Ref< MessageGrp > &msg)
       ActiveMsgMemoryGrp (const Ref< KeyVal > &)
       void set_localsize (size_t)
           Set the size of locally held memory.
       void * localdata ()
           Returns a pointer to the local data.
       void * obtain_writeonly (distsize_t offset, int size)
           This gives write access to the memory location. No locking is done.
       void * obtain_readwrite (distsize_t offset, int size)
           Only one thread can have an unreleased obtain_readwrite at a time.
       void * obtain_readonly (distsize_t offset, int size)
           This gives read access to the memory location. No locking is done.
       void release_readonly (void *data, distsize_t offset, int size)
           This is called when read access is no longer needed.
       void release_writeonly (void *data, distsize_t offset, int size)
           This is called when write access is no longer needed.
       void release_readwrite (void *data, distsize_t offset, int size)
           This is called when read/write access is no longer needed.
       void sum_reduction (double *data, distsize_t doffset, int dsize)
       void sum_reduction_on_node (double *data, size_t doffset, int dsize, int node=-1)
       void print (std::ostream &o=ExEnv::out0()) const
           Prints out information about the object.

       Public Member Functions inherited from sc::MsgMemoryGrp
       MsgMemoryGrp (const Ref< MessageGrp > &msg)
       MsgMemoryGrp (const Ref< KeyVal > &keyval)
       void set_localsize (size_t localsize)
           Set the size of locally held memory.

       Public Member Functions inherited from sc::MemoryGrp
       MemoryGrp (const Ref< KeyVal > &)
       int me () const
           Returns who I am.
       int n () const
           Returns how many nodes there are.
       size_t localsize ()
           Returns the amount of memory residing locally on me().
       distsize_t localoffset ()
           Returns the global offset to this node's memory.
       int size (int node)
           Returns the amount of memory residing on node.
       distsize_t offset (int node)
           Returns the global offset to node's memory.
       distsize_t totalsize ()
           Returns the sum of all memory allocated on all nodes.
       virtual void * malloc_local (size_t nbyte)
           Allocate data that will be accessed locally only.
       virtual double * malloc_local_double (size_t ndouble)
       virtual void free_local (void *data)
           Free data that was allocated with malloc_local_double.
       virtual void free_local_double (double *data)
       virtual void catchup ()
           Processes outstanding requests.

       Public Member Functions inherited from sc::DescribedClass
       DescribedClass (const DescribedClass &)
       DescribedClass & operator= (const DescribedClass &)
       ClassDesc * class_desc () const  throw ()
           This returns the unique pointer to the ClassDesc corresponding to the given type_info
           object.
       const char * class_name () const
           Return the name of the object's exact type.
       int class_version () const
           Return the version of the class.

       Public Member Functions inherited from sc::RefCount
       int lock_ptr () const
           Lock this object.
       int unlock_ptr () const
           Unlock this object.
       void use_locks (bool inVal)
           start and stop using locks on this object
       refcount_t nreference () const
           Return the reference count.
       refcount_t reference ()
           Increment the reference count and return the new count.
       refcount_t dereference ()
           Decrement the reference count and return the new count.
       int managed () const
       void unmanage ()
           Turn off the reference counting mechanism for this object.
       int managed () const
           Return 1 if the object is managed. Otherwise return 0.

       Public Member Functions inherited from sc::Identity
       Identifier identifier ()
           Return the Identifier for this argument.

   Friends
       class MTMPIThread

   Additional Inherited Members
       Static Public Member Functions inherited from sc::MemoryGrp
       static MemoryGrp * initial_memorygrp (int &argc, char **argv)
           Create a memory group.
       static MemoryGrp * initial_memorygrp ()
       static void set_default_memorygrp (const Ref< MemoryGrp > &)
           The default memory group contains the primary memory group to be used by an
           application.
       static MemoryGrp * get_default_memorygrp ()
           Returns the default memory group.

       Protected Member Functions inherited from sc::MemoryGrp
       void obtain_local_lock (size_t start, size_t fence)
       void release_local_lock (size_t start, size_t fence)

       Protected Member Functions inherited from sc::RefCount
       RefCount (const RefCount &)
       RefCount & operator= (const RefCount &)

       Protected Attributes inherited from sc::ActiveMsgMemoryGrp
       char * data_

       Protected Attributes inherited from sc::MsgMemoryGrp
       Ref< MessageGrp > msg_

       Protected Attributes inherited from sc::MemoryGrp
       int me_
       int n_
       distsize_t * offsets_
       int debug_

Detailed Description

       This MemoryGrp class requires a MT-safe MPI implementation.

       The default MessageGrp must be a MPIMessageGrp. MPI must be safe with respect to the
       default ThreadGrp. Alternately, a MessageGrp and a ThreadGrp can be passed to the
       constructor.

Constructor & Destructor Documentation

   sc::MTMPIMemoryGrp::MTMPIMemoryGrp (const Ref< MessageGrp > & msg, const Ref< ThreadGrp > &
       th, MPI_Comm comm = MPI_COMM_WORLD)
       Construct a MTMPIMemoryGrp given a MessageGrp, ThreadGrp, and an MPI communicator. The
       communicator can be a subset of MPI_COMM_WORLD, in which case, the MessageGrp must refer
       to the same subset.

   sc::MTMPIMemoryGrp::MTMPIMemoryGrp (const Ref< KeyVal > &)
       Construct a MTMPIMemoryGrp given a KeyVal input object. A fully thread safe MPI is needed
       (MPI_THREAD_MULTIPLE).

Member Function Documentation

   void sc::MTMPIMemoryGrp::activate () [virtual]
       Activate is called before the memory is to be used.

       Reimplemented from sc::MemoryGrp.

   void sc::MTMPIMemoryGrp::deactivate () [virtual]
       Deactivate is called after the memory has been used.

       Reimplemented from sc::MemoryGrp.

   void sc::MTMPIMemoryGrp::sync () [virtual]
       Synchronizes all the nodes. This is useful after remote memory writes to be certain that
       all of the writes have completed and the data can be accessed locally, for example.

       Reimplemented from sc::MsgMemoryGrp.

Author

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