NAME

       sc::RDMAMemoryGrp - The RDMAMemoryGrp abstract class specializes the MsgMemoryGrp class.

SYNOPSIS

       #include <memrdma.h>

       Inherits sc::MsgMemoryGrp.

       Inherited by sc::ARMCIMemoryGrp.

   Public Member Functions
       RDMAMemoryGrp (const Ref< MessageGrp > &msg)
       RDMAMemoryGrp (const Ref< KeyVal > &)
       void * localdata ()
           Returns a pointer to the local data.
       void set_localsize (size_t localsize)
           Set the size of locally held memory.
       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.

   Protected Member Functions
       virtual void retrieve_data (void *, int node, int offset, int size, int lock)=0
       virtual void replace_data (void *, int node, int offset, int size, int unlock)=0
       virtual void sum_data (double *data, int node, int doffset, int dsize)=0
       void * malloc_region (size_t nbyte)
       void free_region (void *)

   Protected Attributes
       char * data_
       std::vector< Pool * > pools_
       size_t default_pool_size_

   Additional Inherited Members

Detailed Description

       The RDMAMemoryGrp abstract class specializes the MsgMemoryGrp class.

       It uses RDMA to implement global shared memory.

Member Function Documentation

   void* sc::RDMAMemoryGrp::obtain_readwrite (distsize_t offset, int size) [virtual]
       Only one thread can have an unreleased obtain_readwrite at a time. The actual memory
       region locked can be larger than that requested. If the memory region is already locked
       this will block. For this reason, data should be held as read/write for as short a time as
       possible.

       Implements sc::MemoryGrp.

   void sc::RDMAMemoryGrp::release_readwrite (void * data, distsize_t offset, int size) [virtual]
       This is called when read/write access is no longer needed. The memory will be unlocked.

       Implements sc::MemoryGrp.

   void sc::RDMAMemoryGrp::set_localsize (size_t) [virtual]
       Set the size of locally held memory. When memory is accessed using a global offset
       counting starts at node 0 and proceeds up to node n() - 1.

       Reimplemented from sc::MsgMemoryGrp.

Author

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