※ 本文為 swallow.bbs. 轉寄自 cd.twbbs.org 更新時間: 2013-01-31 01:54:22
看板 P_RedWolf
作者 標題 [OS] 羅習五 11/04
時間 Tue Nov 4 10:07:31 2008
投影片更新!!
※non-preemptable kernel
理論上task在進入kernel後 完成後直接回到user mode
non-的話 task在kernel可被中斷然後繼續做完(但橘色線在kernel中會做到自動跳出)
在回到user mode前先進去scheduler抓下一項
※preemptable kernel
task 在interrupt後可馬上接schedule後切換到user space
橘色線可被優先權更高的事情中斷 不一定要做到在kernel中自動停止
-強大但是xxxx over head很多 吃很多空間
non-preemptbale
server 因為over head低
preemptable
Low-xxxxxxx(更新的投影片裡有....)
Dispatcher
http://en.wikipedia.org/wiki/Dispatcher
Dispatcher - Wikipedia, the free encyclopedia
Dispatchers are communications personnel responsible for receiving and transmitting pure and reliable messages, tracking vehicles and equipment, and recording other important information.[1] A number of organizations, including police and fire departments, emergency medical services, taxicab provide ...
Dispatchers are communications personnel responsible for receiving and transmitting pure and reliable messages, tracking vehicles and equipment, and recording other important information.[1] A number of organizations, including police and fire departments, emergency medical services, taxicab provide ...
Scheduling Criteria
-cpu操勞程度
-單位時間完成件數
-單一程式執行時間
-程式等待時間
-回應時間/output 和執行時間不盡相同
turnaround time - 進門要包好兩百個便當 直到把兩百個便當領走
respond time - 老闆可以邊包邊告訴你進度
waiting time - 包一個便當的出現了 先幫他包 因為200者不過多一點點
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紅狼太難畫了 我可不可以畫隻紅色的波利就好？
『紅色波利』
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