资 源 简 介
XPMEM is a Linux kernel module that enables a process to map the memory of another process into its virtual address space. Source code can be obtained by cloning the Mercurial repository or by downloading a tarball from the Downloads link above.
The XPMEM API has three main functions:
xpmem_make() xpmem_get() xpmem_attach()
A process calls xpmem_make() to export a region of its virtual address space. Other processes can then attach to the region by calling xpmem_get() and xpmem_attach(). After a memory region is attached, it is accessed via direct loads and stores. This enables upper-level protocols such as MPI and SHMEM to perform single-copy address-space to address-space transfers, completely at user-level.
XPMEM regions are free to have "holes" in them, meaning virtual memory regions that are not allocated. This makes XPMEM somewhat more flexible than mmap(). A process could, for example, export a region via XP
