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 ?
He said that Hot Spot just creates confusion, adding that sometimes it shows up and sometimes it doesn't, making no one really trust it.
The researchers screened nearly 2,000 compounds from a library of small organic molecules, identifying 85 that had a high affinity for the hot spot.
As the plate has moved, new, thicker crust has slid over the hot spot, making it harder for magma to punch through.
LAOS] has a hot spot that is identical to R391, we show evidence for a possible independent emerging of SX[T.
The continent-wide reach of DIRECWAY Wi-Fi Access means that retailers can offer consistent, reliable Hot Spot service to any or all franchisee, or company-owned locations.
It quickly became evident that the hot spots often resulted from very large amounts of random I/O.
to make corners more moldable by eliminating hot spots.
Latin America and the Caribbean are home to seven of the 25 hot spots, including parts of Mexico and Central America, the Andes mountain range and Brazil.
This secluded hot spot was adjacent to the bridge and park.
If the link between hot spots and the ULVZ holds, it offers insight into aspects of Earth's evolution.
In addition, there are smaller hot spots that speckle the sun "like German measles," says codiscoverer Andrea K.