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. [Jargon File] (1995-02-16)

Style="border-width:thin; border-color:#333333; border-Style:daShed; padding:5px;" align="left">In addition Suitable contentS:
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