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In computing, mmap(2) is a POSIX-compliant Unix system call that maps files or devices into memory. It is a method of memory-mapped file I/O. It implements demand paging because file contents are not immediately read from disk and initially use no physical RAM at all.
Memory-mapping may not only bypass the page file completely, but also allow smaller page-sized sections to be loaded as data is being edited, similarly to demand paging used for programs. The memory mapping process is handled by the virtual memory manager , which is the same subsystem responsible for dealing with the page file .
In computing, memory mapping may refer to: Memory-mapped file , also known as mmap() Memory-mapped I/O , an alternative to port I/O; a communication between CPU and peripheral device using the same instructions, and same bus, as between CPU and memory
Memory-mapped I/O is preferred in IA-32 and x86-64 based architectures because the instructions that perform port-based I/O are limited to one register: EAX, AX, and AL are the only registers that data can be moved into or out of, and either a byte-sized immediate value in the instruction or a value in register DX determines which port is the source or destination port of the transfer.
In computer science, a memory map is a structure of data (which usually resides in memory itself) that indicates how memory is laid out. The term "memory map" has different meanings in different contexts. It is the fastest and most flexible cache organization that uses an associative memory. The associative memory stores both the address and ...
The Internet Mapping Project [1] [2] was started by William Cheswick and Hal Burch at Bell Labs in 1997. It has collected and preserved traceroute-style paths to some hundreds of thousands of networks almost daily since 1998.
T Map by SK Telecom; One Navi by KT corporation; Spain. Spanish official cartography website, including National Topographic Maps MTN50 (1:50,000 scale) and MTN25 (1:25,000 scale). SITPA-IDEAS, Asturias regional maps. Sweden. Eniro.se, also covers Denmark, Finland and Norway; Hitta.se; Thailand "Longdo Map", by Longdo.
Web mapping or an online mapping is the process of using, creating, and distributing maps on the World Wide Web (the Web), usually through the use of Web geographic information systems (Web GIS). [ 1 ] [ 2 ] [ 3 ] A web map or an online map is both served and consumed, thus, web mapping is more than just web cartography , it is a service where ...