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.
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."
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.
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).
5. More generally, any place in a hardware design that turns into a performance
bottleneck due to resource contention.
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