CS40 Operating Systems

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Homework -
Read - textbook chapters we are covering now on the topic of memory management. Those are chapters 7 and 8.
Do - assgt 7. Name the file you submit on sputnik "pageaddr" please.
Do - assgt 8. Please turn in, on paper, in class. (5/2)

"memory3.c" memory exhaustion / virtual mem demo experiment:

	classroom	dell	rh (old P166)	monarch	V1
RAM	512	512	64	1037	64
swap	1024	1024	150	2048	313

slowdown			51		45
termination	1309/1450	1434	198		325

Test - Friday April 18. Please bring a Scantron form (green #882). (4/16)

Student internship - at Sun Microsystems El Segundo. (4/16)

Memory management - broad current topic of current interest. See link entitled "Management types" for an outline of different techniques and approaches. (3/28)

Grades - have been posted, up to date except assignment 4 not yet included. (3/28)

Spring break April 11 - no class that day. (3/28)

Homework -
visit - jim w's page of yellowing computer photos, and the computer museum
skim - the Intel document at link entitled "Intel chip architecture," at left
read - textbook chapter 2 up to page 74
do - assignment 2, get licensed to drive ftp please. (3/10)

Homework - due 3/21
please do assignment 4, regarding MBR and partition records. Despite the wording in the assignment, you don't need to obtain or print out the MBR on which it is based. That's already provided in hexdump, printed form. See the link entitled "session capture" at right, under the "Assgt. 4" link. There, the MBR you want to look at is at the very bottom of the page. You just need to analyze what you see there, answering the assignment's questions about it. Please put the answers on a scantron form. (3/14)

Homework -
do - binary math problems, assgt 2.5. Turn in on paper
do - assgt 2 ftp
read - chapter 1 appendix b regarding the role of stacks in procedure calls
review - slides at link entitled "OS Installation," lower left (3/7)

Grades - please see link entitled "Grade information" at left.

For book problem 1.12:

One student: "I am confused on part C."
My response:
See the link in the assignment to my write-up.
Look at the last equation there.
Part "c" tells us that T_ave (which author calls "effective access time") is 10% more that T_fast (which he calls "cache access time")
So, plug in the numbers and crank out H.
If you do so and show it to me I'll give credit.

Same offer goes to anybody else who didn't get the correct answer, for this particular part of this particular problem, . (3/7)

Installing software on class machines - I learned how to adjust to overcome the recent change in the College network that now blocks our machines from using the internet to download and install software. I'll guide you to adjust your machines in class so you can install the "ddd" debugger interface we wanted, and other things as needed in the future. (3/5)

Another request - please turn the computers off at the end of class. I make the rounds and do it but it would be helpful if you turned off your own machines. In linux, "poweroff" at a command prompt does the job. (3/5)

A linked list - of the states. Please see the link entitled "Linked list of states" at lower left. Make sure you follow the linkages contained, in light of our discussion of linked lists last Friday. Or ask in class if you want me to show the states list. (3/5)

Request - please don't change the root account passwords on the lab computers, as 3 different classes use them. (3/2)

Adding 3 plus 2 in real life - look at Figure 1.4 in the William Stallings text book. It exemplifies a machine language program that adds 3 plus 2. I wrote such a program myself to do exactly that, in order to embody the Figure in real life. See the in-class exercise at the link entitled "3+2=5" below right. (2/29)

Accounts on sputnik.smc.edu were created today - see "Remote Unix system" paragraph below. (2/24)

Homework - due on paper 3/1
-do assignment 1.5, consisting of the textbook's exercises 1.1 and 1.12. For 1.12, please understand that as a matter of terminology, when the author says "effective" access time it means the same thing as "average" access time. That should help you correlate the problem with the my write-up (link at left entitled "Caching") where I use the term "average." (2/22)

Homework - please
- do assignment 1 (read "Remote UNIX system" below and the link entitled "Remote Unix access with telnet" at left).
- read chapter 1 of the textbook
- read the 7 links about binary and other number systems, below left, under the heading "Number bases" in the "Foundation Concepts" section.
-anticipate, from assignment 1.5, the book's problem 1.1 at the end of Chapter 1, by reviewing the instruction execution example in Figure 1-4 of the textbook and associated discussion. (2/15)

Foundation concepts you should be(come) familiar with as background/prerequisite for this class:
Data structures (lists, stacks)
Binary and hexadecimal number representation
Compiling/linking/loading (symbols, address fixups)
ASCII code
Processor instruction sets
System architectures (bus, data lines, interrupt lines)
Use of telnet
Use of ftp

Remote Unix system
Your username - your last name as it appears on my class list, all lowercase (e.g., bush).
Your password - is 5 digits extracted from your phone number. If your phone number is 123-456-9876, then your password will be 56987 (final 2 digits from the 3-digit exchange, plus first 3 digits of the 4-digit number).
The target computer - is sputnik.smc.edu
Log in method - the assignment asks you to "log in." Translation: use telnet as discussed in class and described in the "Remote Unix access with Telnet" link at left.
Accounts will be set up shortly. (2/15)