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 ?
They developed a method to analyse the relative motion of 56 hot spots grouped by tectonic plates.
In Lodhran, officials witnessed three hot spots of white fly, Aphid (2), Thrips (2), and armyworm (4) while two hot spots of Aphid were reported from Bahawalpur.
Myth: Provide plenty of fresh drinking water for your dog so that dehydration doesn't cause stress-related hot spots.
The apparent chronology of this picket fence of volcanoes and seamounts, along with evidence culled from the chemistry of their respective lavas, led some scientists decades ago to speculate that the islands were formed as the ocean crust supporting them inched northwest over an abnormally hot spot in Earth's mantle.
However, the gene was not found in any of the proposed hot spot regions.
Scientists are taking a closer look at the hot spot (one of about 40 in the world) to learn how Earth's heated interior molds the planet's surface.
Cross ribbing creates hot spots and makes feeding difficult.
Finally, by establishing goals and priorities to determine where they need police patrols, officers can attack these hot spots in an effective and efficient manner.
Binding of hot spots at run time (by interaction with an end user or by a lookup in tables or in a plan [8, 9]) requires a supporting class structure.
Wi-Fi phones are opening up a new market for low-cost mobile calling, which is really only fulfilled if the device can roam onto public hot spots," said Jonathan Mendelson, director of business development for devices at Boingo Wireless.
In a cotton advisory released by media liaison unit of Punjab Agriculture department on Tuesday, experts said that surveys being conducted by Pest Warning and Quality Control of Pesticides wing of the Agriculture department have shown a surge in Jassid incidence and minor increase in hot spots of other pests and bollworms including white fly.
The team found the wave responsible for the hot spots glides up and down through layers of the atmosphere like a carousel horse on a merry-go-round.