latency

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latency

[′lat·ən·sē]
(computer science)
The waiting time between the order to read/write some information from/to a specified place and the beginning of the data-read/write operation.
(medicine)
The stage of an infectious disease, other than the incubation period, in which there are neither clinical signs nor symptoms.
(physiology)
The period between the introduction of and the response to a stimulus.
(psychology)
The phase between the Oedipal period and adolescence, characterized by an apparent cessation of psychosexual development.

latency

(communications)
1. The time it takes for a packet to cross a network connection, from sender to receiver.

2. The period of time that a frame is held by a network device before it is forwarded.

Two of the most important parameters of a communications channel are its latency, which should be low, and its bandwidth, which should be high. Latency is particularly important for a synchronous protocol where each packet must be acknowledged before the next can be transmitted.

latency

(1) Essentially any delay or lapse in time. In general, it is the time between initiating a request in the computer and receiving the answer. Data latency may refer to the time between a query and the results arriving at the screen or the time between initiating a transaction that modifies one or more databases and its completion.

Disk latency is the time it takes for the selected sector to be positioned under the read/write head. Channel latency is the time it takes for a computer channel to become unoccupied in order to transfer data. Network latency is the delay introduced when a packet is momentarily stored, analyzed and then forwarded.

(2) With malicious software, latency is the period between infection and the first obvious damage to the host system. Many viruses or logic bombs written by amateurs have a short latency and are therefore relatively easy to detect; however, more vicious malware can lie dormant or replicate to many other hosts and then wreak havoc unexpectedly. See logic bomb and virus.
References in periodicals archive ?
By using a newly developed software that relays communications between the client and server, the number of communications made has been significantly reduced, lowering the effects of network latency.
Credit Suisse (NYSE: CS) has implemented a network latency management system.
By contrast, SpeedCheckr is not affected by network latency, allowing users to get much more accurate results that are not impacted by test location.
Data intensive, in-memory and high-performance applications require the lowest possible network latency.
By unifying application and network latency management together with high capacity packet capture, CorvilNet offers customers for the first time a single platform solution for all their latency management and data capture requirements.
The platform is said to provide visibility into the performance of the IP transit product and intelligently route traffic by monitoring the Internet, measuring network latency and packet loss over the major carriers, and adjusting customer traffic to the optimal path.
The multipurpose, non-blocking transparent switch provides high-speed switching between ports, with minimal effect on overall network latency.
It tested its new OSN version, including a feature to reduce network latency effects, in an HSDPA trial setting with an European infrastructure provider.
Real-time synchronous replication works well in high-bandwidth network environments, such as a Fibre Channel SAN or MAN, but when the primary and secondary storage servers are separated by more than a few miles, network latency can cause serious performance problems for the storage application.
Endace Launches Service Offering to Meet the Specific Needs of Service Providers and Trading Organisations Requiring Highly Accurate Network Latency Measurements
Network latency is also minimised by up to 100% and mobile service providers can offer premium services to content providers and an SLA (Service Level Agreement).
xPI is designed specifically for the financial market so managers can ensure their essential networks deliver sub-millisecond performance with no load on network hardware and minimal network latency impact.

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