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 ?
In a release issued by media liaison unit of Punjab agriculture department, experts said Pest Warning and Quality Control of Pesticides (PCQCP) wing of agriculture department has witnessed some hot spots in cotton rich districts.
Folklore abounds with tales about hot spots that often have little basis in truth.
2) Identifying these hot spots through crime analysis and crime-specific planning can lower the level and the fear of crime.
Also, a polymorphic reference typed with the base class is contained in or attached to a hot spot subsystem.
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.
Two hot spots of white fly, five hot spots of Jassid and one Mealy bug hot spot were witnessed in Sahiwal.
The absence of Hot Spot means television umpires will be restricted to using Eagle Eye ball-tracking software, audio from stump microphones, and slow-motion replays when England or Australia review an umpire's decision during the Ashes, which begins on November 21, in Brisbane, the report added.
So, much of the plume stalled in the middle layers of the mantle, and the small finger that eventually ascended to the crust was narrow and created only a weak hot spot.
The best way to determine the location of the hot spot is to put a steel plate target in line and on top of the work and blast it for 30 sec [ILLUSTRATION FOR FIGURE 3 OMITTED].
One hot spot of white fly, three hot spots of Aphid and a hot spot of armyworm were reported from Muzaffargarh.
From the Cassini movies, the researchers mapped the winds in and around each hot spot and plume, and examined interactions with vortices that pass by, in addition to wind gyres, or spiraling vortices, that merge with the hot spots.