1. (primarily used by ref="module.php?name=Lexikon&file=search&eid=1&query=C">C/ref="module.php?name=Lexikon&file=search&eid=1&query=Unix">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 ref="module.php?name=Lexikon&file=search&eid=1&query=hand-hacking">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 ref="module.php?name=Lexikon&file=search&eid=1&query=tune">tune, ref="module.php?name=Lexikon&file=search&eid=1&query=bum">bum, ref="module.php?name=Lexikon&file=search&eid=1&query=hand-hacking">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. ref="module.php?name=Lexikon&file=search&eid=1&query=Hypertext">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 ref="module.php?name=Lexikon&file=search&eid=1&query=massively parallel">massively parallel computer with ref="module.php?name=Lexikon&file=search&eid=1&query=shared memory">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 ref="module.php?name=Lexikon&file=search&eid=1&query=busy-wait">busy-wait on the same lock). 5. More generally, any place in a hardware design that turns into a performance ref="module.php?name=Lexikon&file=search&eid=1&query=bottleneck">bottleneck due to resource contention. [ref="module.php?name=Lexikon&file=search&eid=1&query=Jargon File">Jargon File] (1995-02-16)

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