CS 3853 Computer Architecture Recitation 1 Fall 2013
There will be a quiz in the first recitation.
It will be a closed book exam. You may not use a computer.
You should bring a calculator that can do add, subtract, multiply, divide, powers (yx), and logs.
You may not use a calculator that can connect to a network, such as a cell phone.
The quiz will consist of three questions and each problem is worth 3 points:
- 1 point for turning in the paper
- 2 points for showing some reasonable work
- 3 points for showing work and getting the correct answer and putting a box around it
Two of the problems will be similar to the first two
daily questions from the first class..
The third question will be of the form:
If A is n% faster than B, and B is m% faster than C, how much faster is A than C?
After turning in the quiz, start on the problems below.
- If machine performance improves by 20% per year, by what percentage will it have improved after 5 years?
- If machine A is 60% faster than machine B and machine A is 80% faster than machine C, how much faster is machine B than C?
- If machine performance has improved by a factor of 10,000 over 30 years, at what percentage did it increase each year,
assuming that each year had the same percentage increase?
- Estimate the number of dies on a 300 mm wafer if the dies are 15 mm by 10 mm.
(Use the formula on page 30 of the text.)
- For the above problem if it costs $5,000 to produce a wafer, how much would it cost for each die if the yield is 50%?
- The MTTF of a new disk drive is 1,000,000 hours.
You create a disk farm from 1000 of these new disks.
- How many would you expect to fail in the first year?
- How many these disks would you have to replace in the first 20 years?