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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 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 .
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
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.
Mobile mapping is the process of collecting geospatial data from a mobile vehicle, [1] typically fitted with a range of GNSS, photographic, radar, laser, LiDAR or any number of remote sensing systems. Such systems are composed of an integrated array of time synchronised navigation sensors and imaging sensors mounted on a mobile platform. [2]
The Construction, Maintenance and Allied Workers Canada (CMAW) is a construction trade union headquartered in Vancouver. The purpose of the CMAW is to negotiate pay and work conditions on behalf of its 8,000 members in British Columbia and Alberta. It is affiliated with the independent Confederation of Canadian Unions.
The Midwest Consortium for Hazardous Waste Worker Training provides training to workers who may be exposed to hazardous materials while performing jobs covered by the Occupational Safety and Health Administration’s (OSHA) Hazardous Waste Operations and Emergency Response standard, and to help employers comply with OSHA standard 29 CFR 1910.120.