Re: [問題] 作業系統
※ 引述《linlinyu (....)》之銘言：
: ※ 引述《booom (大村拓哉)》之銘言：
: : weii的意思是說
: : 請你以英文專有名詞
: : 再把你的問題敘述一次...
: Compare the "prefetching" scheme with "spooling",where the CPU overlaps
: the input of one job with the computation and output of other jobs.
: 謝謝!!
Prefetching is a user-based activity, while spooling is a system-based
activity. Spooling is a much more effective way of overlapping I/O and
CPU operations.
The central idea of both prefetching and spooling is to try to keep
both CPU and I/O busy, so as to improve the performance of the system.
When doing prefetching, the structions may need to be rearranged, so
that to start read as early as possible, and probably to postphone some
write until the output device can accept them. Spooling is often used in
batch processing, there are many tasks ready to be run in the system, so
the system has more freedom to schedule them to improve the performance.
加油吧~
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我愛用UD
我希望Blizzard可以讓nec招換出來的骷髏兵強壯一點
最好身高一米九 一拳三百磅
不然骷髏兵實在太廢~
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