Mapped memory permits different processes to communicate via a shared file.
Mapped Memory permits different processes to communicate via a shared file. Although you can think of mapped memory as using a shared memory segment with a name, you should be aware that there are technical differences. Mapped memory can be used for interprocess communication or as an easy way to access the contents of a file.
Mapped memory forms an association between a file and a process's memory. Linux splits the file into page-sized chunks and then copies them into virtual memory pages so that they can be made available in a process's address space. Thus, the process can read the file's contents with ordinary memory access. It can also modify the file's contents by writing to memory. This permits fast access to files.
