sc::rdmamemorygrp(3)

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_

Detailed Description

The RDMAMemoryGrp abstract class specializes the MsgMemoryGrp class.

It uses RDMA to implement global shared memory.

Member Function Documentation

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.; Reimplemented in sc::ARMCIMemoryGrp.
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.

Author

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