问题 单项选择题

下列______作业调度算法既考虑公平性又考虑增加系统吞吐量。

A.先来先服务调度算法

B.短作业优先算法

C.最高响应比作业优先算法

D.资源均衡搭配算法

答案

参考答案:C

解析:响应比最高者优先算法是综合考虑作业的等待时间和计算时间,把响应比定义为: 响应比=等待时 间/计算时间。计算时间短的作业容易得到较高的响应比,而可能被优先选中。但是一个计算时间长的作业 在等待较长时间之后,也会有较高的响应比,也会有机会被选中。因而避免了因源源不断有计算时间短的 作业进入输入井而无限期地推迟计算时间长的作业的执行。显然,这种算法兼顾了系统的效率和对用户的 公平性。

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问答题

Passage 2
Seventeen years after the fall of the Berlin wall, a reunified Germany will throw open its doors to the world. Germany 2006 will be a place where people from all around the world will be welcomed by friends. The tournament is being held on the finest stage in the world, one whose symbolism far transcends the boundaries of sport. Hark back to Germany’s triumph at the 1954 FIFA World Cup in Switzerland, which sealed the country’s return to the international fold in the most beautiful manner possible.// In 2006, Germans will have the opportunity to rectify certain cliches and preconceived ideas. The world will have the chance to see what a fantastic country Germany truly is: the beauty and diversity of its landscapes, its rich cultural heritage and the intelligence and good humor of its people. As for the legendary German work ethic and organizational skills, I am pleased to say those perennial qualities are alive and well -- and we at FIFA are only too happy to take advantage of them.//
For at all levels, the overall investment in any World Cup tournament is immense. The event is financially supported by the German state, but also by the "lender" and the Host Cities. I would like to take this opportunity to offer my heartfelt thanks to all those who are currently working with such passion and commitment to make the occasion a memorable one. Today’s efforts will bear fruit tomorrow.
German football, for example, will boast twelve spanking new or vastly improved stadiums in 2006. The whole German population too will benefit in terms of better transport and reception infrastructures.//
Football clubs, schools and people all over the land have really got behind this great event, providing further proof, if any were needed, of the prominent role football plays in all our lives. In this respect I would like to congratulate the German Football Association for inviting people from all walks of life to take part in this great event. Like Mexico, Italy and France, Germany is now organizing its second FIFA World Cup. Back in 1974 when it first held the World Cup, only sixteen sides took part, including the now-defunct German Democratic Republic (GDR) and Zaire. The latter were the only representative from the African continent and conceded fourteen goals with no reply.//
The 2006 tournament will be a vastly different affair. Thirty-two teams will have qualified, including five from Africa, all of whom now perform at a far higher level. These performances bear witness to FIFA’s efforts in the last quarter of a century to help the nations of the football world to compete on an equal footing. I will have the immense pleasure of welcoming you amongst my friends in Germany. We look forward to seeing you in 2006 to celebrate this unity!//