address space


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address space

[′ad·rəs ‚spās]
(computer science)
The number of storage locations available to a computer program.

address space

(operating system, architecture)
The range of addresses which a processor or process can access, or at which a device can be accessed. The term may refer to either physical address or virtual address.

The size of a processor's address space depends on the width of the processor's address bus and address registers.

Each device, such as a memory integrated circuit, will have its own local address space which starts at zero. This will be mapped to a range of addresses which starts at some base address in the processor's address space.

Similarly, each process will have its own address space, which may be all or a part of the processor's address space. In a multitasking system this may depend on where in memory the process happens to have been loaded. For a process to be able to run at any address it must consist of position-independent code. Alternatively, each process may see the same local address space, with the memory management unit mapping this to the process's own part of the processor's address space.

address space

A computer's address space is the total amount of memory that can be addressed by the computer. The term may refer to the physical memory (RAM chips) or virtual memory (disk/SSD). For example, a 32-bit computer can address 4GB of physical memory and as much as 64TB of virtual memory. See address register and flat address space.
References in periodicals archive ?
This approach allows all of the pointers from old objects to young objects to be grouped together so that the scavenger can access them efficiently without accessing pages scattered about the address space. This approach also introduces a level of dynamic indirection not present in the page marking scheme.
Through the new INTEGRITY NPW, users can now select their target BSP, define the number of address spaces they need and specify desired shared libraries and dynamic load modules.
He added that the US military must address space as a war fighting domain and may create a new combat command post.
That advice would be true if it properly implemented the defense known as Address Space Layout Randomization (ASLR).
The number of mobile devices connected to the Internet has blossomed, causing the IPv4 address space to reach saturation in some geographies.
Timely Address Space Randomization (TASR) protects against the exploitation of software vulnerabilities by preventing attackers from using information leaks to hijack program control.
Model -- Create and model IPv6 blocks and networks including local and global unicast address space for optimal design.
Bubashait went on to say: "On Friday 14 September, 2012, the RIPE NCC, the Regional Internet Registry (RIR) for Europe, the Middle East and parts of Central Asia, distributed the final IPv4 address space from its reserves of IP addresses version 4.
Axel Pawlik, Managing Director of the RIPE National Cordination Centre said: "When the internet was first designed, it seemed highly unlikely that IP address space would ever be an issue.
While NAT promotes conservation of the public address space, it does not support standards-based network layer security or the correct mapping of all higher layer protocols.
Servers can be incrementally adapted to IPv6 even after depletion of the IPv4 address space.
Islamabad -- Pakistan Telecommunication Company Limited (LTD) has successfully deployed Internet Protocol version 6 (IPv6) to provide large address space to its valued broadband customers.

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