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 ?
PinPoint displays detailed status based on one of the following: client IP address, port number, address space name, printer IP address, critical resource IP address, link name and TCP/IP protocol.
Deployment of these services vastly increases the complexity of managing IP address space and associated DHCP and DNS server configurations.
So we allocated address space sort of like telephone numbers sufficient to define 4.
The institutions that control IP addresses internationally and in the Asia-Pacific region have depleted the IPv4 address space, and are promoting a transition to IPv6 with the World IPv6 Launch.
The rapid growth of global Internet users and an increasing need for unique IP addresses exhausted the address space about 30 years after the standardization of IPv4 in 1981
Our products now uniquely enable customers to simplify organization of address space and streamline allocation of address blocks and subnets based on this organization and associated policies.
The latest data from the Regional Internet Registries, which are responsible for allocating address blocks to ISPs and large organizations, says that less than 18% of the total IPv4 address space available to them was allocated between January 1999 and June 2003.
According to Silvia Hagen, the Swiss-based IPv6 consultant and author of the technical resource IPv6 Essentials, what drives the deployment in Asia is basically just the address space problem.
However, Opteron is not a "pure" 64-bit compute architecture; it incorporates a 48-bit virtual address space and a 40-bit physical address space, versus Itanium 2's 64-bit virtual addressing and 50-bit physical address space.
Installed as a server in an organization's DMZ beside Web, e-mail and other servers, the product seamlessly translates VoIP call streams between the internal private IP address space and the external global address space, enabling calls to pass into and out of the organization across the NAT boundary.
There is a read and write stream that is uniformly distributed over the entire address space, as well as some highly localized I/O to specific areas of the ASU.
Telecomms solutions provider Global Crossing has released a free Internet tool that can reportedly assist in the management and assignation of Internet Protocol address space.