dear all:
I am a student from oversea.
I am not good in english but I take a course in computer science,
recently our professer give me a test,and there is a lot of problem in it. I
am so afraid because most of them I cannot understand, so anybody can help
me to solve some?
I post frist 3 question in that test, and somebody please solve it,
please give me a anwser, and need to explain the process why it is the
answer, okay? :~~~
Q1:consider a memory system with the following parameters:Cache access
time is 100ns, Main memory access time is 1200ns, if we would like to have
effective(average) memory access time to be no more than 20% higher than
cache time, the HIT RATE for the cache must at least be:
1)80% 2)90% 3)98% 4)99% 5)95%
**this question i have to know how to caculate the answer
Q2:the term "aging" refers to:
1)keeping track of the time a page has been in memory for the purpose of LRU
replacement
2)Boosting up the priority of a process in multi-level queue with feedback
3)Gradually increasing the priority of jobs that wait in the system for a
long time to remedy indefinite blocking
4)letting jobs reside in memory for a certain amount of time so the number
of pages required can be estimated accurately.
5)keeping track of the total time a job has been in the system since it was
first submitted N-M
**this question I need to know which is correct, and others are means what.
Q3:a disk information is : track size 10000 bytes, rotational
latency:10ms/revolution, block size:1000bytes, the MAX transfer rate per
track measureed in bits per second as is conventional for this disk unit is:
1)400Mbps 2)8Mbps 3)6400Mbps 4)4250Mbps 5)10Mbps
**this question i need to know to caculate the answer.
thanks your help!! and it will be more thanksful if you reply me with email
I am a student from oversea.
I am not good in english but I take a course in computer science,
recently our professer give me a test,and there is a lot of problem in it. I
am so afraid because most of them I cannot understand, so anybody can help
me to solve some?
I post frist 3 question in that test, and somebody please solve it,
please give me a anwser, and need to explain the process why it is the
answer, okay? :~~~
Q1:consider a memory system with the following parameters:Cache access
time is 100ns, Main memory access time is 1200ns, if we would like to have
effective(average) memory access time to be no more than 20% higher than
cache time, the HIT RATE for the cache must at least be:
1)80% 2)90% 3)98% 4)99% 5)95%
**this question i have to know how to caculate the answer
Q2:the term "aging" refers to:
1)keeping track of the time a page has been in memory for the purpose of LRU
replacement
2)Boosting up the priority of a process in multi-level queue with feedback
3)Gradually increasing the priority of jobs that wait in the system for a
long time to remedy indefinite blocking
4)letting jobs reside in memory for a certain amount of time so the number
of pages required can be estimated accurately.
5)keeping track of the total time a job has been in the system since it was
first submitted N-M
**this question I need to know which is correct, and others are means what.
Q3:a disk information is : track size 10000 bytes, rotational
latency:10ms/revolution, block size:1000bytes, the MAX transfer rate per
track measureed in bits per second as is conventional for this disk unit is:
1)400Mbps 2)8Mbps 3)6400Mbps 4)4250Mbps 5)10Mbps
**this question i need to know to caculate the answer.
thanks your help!! and it will be more thanksful if you reply me with email
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