問86
頻出度★★★
システムにおいて, ある一部分の処理速度が遅いことによって, システム全体の処理速度が低く抑えられているとき, 原因となっている部分を何と呼ぶか。
平成29年度 秋期 ITパスポート試験 問86
テクノロジ系システム構成要素 › システムの評価指標
This question's explanation and your answers so far.
解説
問 86
Incorrectア
“Throughput” is a performance metric expressing the amount of work that can be processed per unit of time (processing capacity); it is not a word for the “slow part” located somewhere in the system. The relationship is that when a bottleneck exists, throughput drops as a result.
Incorrectイ
“Defragmentation” is the name of a maintenance operation that relocates fragmented (fragmentation) files on a hard disk into contiguous areas to improve access efficiency; it is not a word for the “part” that is limiting performance.
Incorrectウ
A “flowchart” is a diagram that represents processing steps or control flow with graphic symbols, and is used for tasks such as program design; it is not a term for the spot that caps performance.
- エ
正解 A “bottleneck” is named after the narrow neck (neck) of a bottle (bottle), which limits the overall flow; it refers to the part of a system with the lowest processing capacity, which therefore caps the overall performance. As the question states, when “one part is slow in processing and thereby keeps the whole system's processing speed held low”, that causal spot is exactly the bottleneck; performance improvement conventionally starts by first identifying and removing this part. Therefore エ is correct.
ここがポイント
- Bottleneck = the part with the lowest processing capacity that limits the whole system's performance. Performance improvement starts first with identifying and removing the bottleneck.
- Distinguishing confusable terms: throughput (a metric of processing capacity), defragmentation (removing disk fragmentation), and flowchart (a diagram of processing steps) are none of them words for the “part that is the cause.”