hot spot

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hot spot

1. an area of potential violence or political unrest
2. 
a. any local area of high temperature in a part of an engine, etc.
b. part of the inlet manifold of a paraffin engine that is heated by exhaust gases to vaporize the fuel
3. Computing a company that provides wireless access to the internet for users of portable computers or the places from which the internet can be accessed in this manner
4. Med
a. a small area on the surface of or within a body with an exceptionally high concentration of radioactivity or of some chemical or mineral considered harmful
b. a similar area that generates an abnormal amount of heat, as revealed by thermography
5. Genetics a part of a chromosome that has a tendency for mutation or recombination

hot spot

See radio-source structure.

hot spot

[′hät ‚spät]
(chemical engineering)
An area or point within a reaction system at which the temperature is appreciably higher than in the bulk of the reactor; usually locates the reaction front.
(computer science)
A word in a multiprocessor memory that several processors attempt to access simultaneously, creating a conflict or bottleneck.
(engineering)
An area in a pipeline that is subject to excessive corrosion.
(forestry)
A forest region where fires occur at frequent intervals.
(graphic arts)
A region of excessive illumination on a photo.
(cell and molecular biology)
A site in a gene at which there is an unusually high frequency of mutation.
(nucleonics)
A surface area of higher than average radioactivity.
A part of a reactor fuel surface element that has become overheated.
(physics)
A localized region with temperature higher than the surroundings.

hot spot

(1)
(primarily used by C/Unix programmers, but spreading) It is received wisdom that in most programs, less than 10% of the code eats 90% of the execution time; if one were to graph instruction visits versus code addresses, one would typically see a few huge spikes amidst a lot of low-level noise. Such spikes are called "hot spots" and are good candidates for heavy optimisation or hand-hacking. The term is especially used of tight loops and recursions in the code's central algorithm, as opposed to (say) initial set-up costs or large but infrequent I/O operations.

See tune, bum, hand-hacking.

hot spot

(2)
The active location of a cursor on a bit-map display. "Put the mouse's hot spot on the "ON" widget and click the left button."

hot spot

(3)
A screen region that is sensitive to mouse clicks, which trigger some action. Hypertext help screens are an example, in which a hot spot exists in the vicinity of any word for which additional material is available.

hot spot

(4)
In a massively parallel computer with shared memory, the one location that all 10,000 processors are trying to read or write at once (perhaps because they are all doing a busy-wait on the same lock).

hot spot

(5)
More generally, any place in a hardware design that turns into a performance bottleneck due to resource contention.
References in periodicals archive ?
Netopia Hot Spots will be available to HTC business clients this month, enabling them to offer Wi-Fi access to their patrons.
Today's mobile devices are increasingly Wi-Fi enabled, but none had a simple option for utilizing public hot spots until today," said Dave Hagan, president and CEO of Boingo Wireless.
The availability of Boingo's device software via open source licensing helps extend UMA service delivery to hot spots worldwide," said Ken Kolderup, Vice President of Marketing for Kineto.
This integration with Netopia Wi-Fi Hot Spots allows us to deliver greater value to our end-users and a more robust offering to our sales channels.
We're interested in using sonoluminescence as a spectroscopic probe of what happens inside hot spots.
Many geophysicists believe hot spots provide a pipeline for transporting heat from the planet's core to its surface.
Maxis, a member of the Wireless Broadband Alliance (WBA), has more than seven million mobile phone subscribers and operates a comprehensive Wi-Fi network, with 118 hot spots in prime locations frequented by the business travelers.
Since his initial study of NGC 253, Forbes told SCIENCE NEWS, he and a team that includes Reinhard Genzel of the Max Planck Institute for Physics and Astro-Physics in Garching, Germany, have detected infrared iron emissions from regions of the starburst galaxy that appear to coincide with the hot spots.
Owen notes that part of the mechanism responsible for hot spots on Saturn resembles that which underlies similar features on Jupiter.
Helio Hybrid users can easily manage their wireless connection to countless Wi-Fi hot spots and a nationwide 3G network.
Between the countless hot spots and speed of Helio's nationwide 3G network, high-speed wireless access is more accessible now than ever," said Greg Hayes, Head of Convergence, HELIO LLC.
In the past, scientists would have identified the Pukapuka Ridges as a "hot spot" trail-a long burn mark made as the Pacific plate passed over a stationary hot spot in Earth's mantle.