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The main difference between System V shared memory (shmem) and memory mapped I/O (mmap) is that System V shared memory is persistent: unless explicitly removed by a process, it is kept in memory and remains available until the system is shut down. mmap'd memory is not persistent between application executions (unless it is backed by a file).
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.
The 16 Divisions of construction, as defined by the Construction Specifications Institute (CSI)'s MasterFormat, is the most widely used standard for organizing specifications and other written information for commercial and institutional building projects in the U.S. and Canada.
The Laboratory's Odyssey project created a geographic information system that served as a milestone in the development of integrated mapping systems. [2] The Laboratory influenced numerous computer graphic, mapping and architectural systems such as Intergraph , Computervision , and Esri .
A memory-mapped file is a segment of virtual memory [1] that has been assigned a direct byte-for-byte correlation with some portion of a file or file-like resource. This resource is typically a file that is physically present on disk, but can also be a device, shared memory object, or other resource that an operating system can reference through a file descriptor.
A software map represents static, dynamic, and evolutionary information of software systems and their software development processes by means of 2D or 3D map-oriented information visualization. It constitutes a fundamental concept and tool in software visualization , software analytics , and software diagnosis . [ 1 ]
In July 2010, MapQuest announced [14] [15] plans to become the first major mapping site to embrace open-source mapping data, launching a new site [16] separate from its main site, entirely using data from the OpenStreetMap project. [17] On July 14, 2010, MapQuest launched a simplified user interface and made the site more compact.
The mapping software outputs a real-time visual representation of the route. The map then moves along the path of the driver. If the driver drifts from the designated route, the navigation system will use the current coordinates to recalculate a route to the destination location.