OS Exercise 9 graded

Exercise 9 have been posted and posted on the Moodle.

Typical points of penalty is "missing explanation (or reason)". For example, in Problem 2 Question 1, just writing "slow" did not give you full mark. You should have said "each memory access (in the program) will incur two extra memory accesses (for page tables)."

If you have any question, please ask the instructor during today's class. (you can ask by email but it may not give you enough time to understand the feedback before the final exam).

OS Exercise 14 posted

The problems for Exercise 14. This is an early release of the problems than usual so that student can start preparation for not only Exercise 14 itself but also for the lecture tomorrow as well as final exam on Friday. If you find any mistakes or types, please contact the instructor.

OS Exercise 8 Graded

Exercise 8 has been graded and posted on the Moodle.

Each "Problem" is given 10pts: (1pt for each blank in Problem 1. 5pts for each Question in Problems 2 and 3).

In Problem 2, some students only obtained part of page table sizes (e.g. only the number of entries, or, the size of entry). The total grade (30pts) is scaled to 100% and posted on the Moodle.

Some students did not follow the submission instructions, which appeared in every Exercise problem sheet; most likely

• Incorrect file name
• Incorrect file type

If you have any question, please ask the instructor (The assistant may seem easy to ask questions, but he can't raise your grade!).

OS Exercise 13 posted

The problems for tomorrow's exercise class have been posted on the Moodle system.

We will work on the similar schedule as previous weeks:

Exercise problems in the lab for the 1st and 2nd periods, finish the exercise class 30minutes earlier and take the lunch break.

We resume the class from 12:40 in the Lecture Hall classroom by reviewing the Exercise 10 problems, followed by the lecture for Chapter 5.

Please come to the lab at 9 tomorrow.

OS Exercise 12 posted

Today's problems have been posted at the Moodle. Please hand in your student evaluation sheet to the assistant before you leave the lab .

OS Exercise 7 graded

Exercise 7 submission have been graded and posted on the Moodle. As it was written in the problem, a, p, d commands and error handling are given 30, 20, 30 and 20% of the grade, respectively.

Typical mistakes include:

• the largest hole size is 'hard-coded' to 64K (not reflecting the actual size of the largest hole)
• the list structure does not follow the actual memory allocation status
• hole-merger cases not handled correctly
• unnecessary 'p' command or debug messsage

Please ask the instructor if you have question.

OS Exercise 11 posted

Today's exercise problems have been posted on the Moodle. Please note that we finish the exercise part of the class earlier (@1130) today.

OS Change of cut-off date for exercise submission

We have changed the definition of the cut-off date for the exercise submission: It was

cut-off date is five weeks from the class, or one week before the final exam, whichever comes first

Now

cut-off date is five weeks from the class, or the end of the day before the final exam, whichever comes first

The final exam is planned on Feb 10 (subject to change). Therefore, Exercise 10 and after can only be submitted by the end of Feb 9.

OS Exercise 10 posted

Problems for today's exercise class have been posted on the Moodle.

OS Exercise 6 graded

Exercise 6 submissions have been graded and posted on the Moodle. The following are grading criteria with allocated point(s):

• Reading input into the appropriate data structures (2pts)
• Input format error Checking (1pt)
• Displaying the initial resource allocation (1pt)
• Banker's algorithm (4pts)

The total points (8pts) are scaled to 100% and posted on the Moodle.

Typical errors/mistakes include:

• No message is printed out when the initial allocation is unsafe
• Imcomplete allocation list in the safe case
• compilation error (why did he submit it?)
• submission of the template file 'as is' (...)

If you have any question, please talk to the instructor during the Exercise class, office hours, or contact by email.

OS Exercise 9 posted

Today's exercise problems have been posted on the Moodle system.

OS Exercise 5 Grades

Exercise 5 has been graded and posted on the Moodle. Grading scheme are as follows.

Each algorithm has been graded in their scheduling chart, statistics table, and job queue (RR only) as follows:

Scheduling (chart): FCFS: 10pts, SJF: 10pts, SRTN: 20pts, RR: 25pts

Statistics: 5pts,

Job Queue: 5pts (RR only)

As the results, each algorithm has the following points:

FCFS: 15pts, SJF: 15pts, SRTN: 25pts, RR: 35pts

The total grade is 90pts and it is scaled to 100%.

OS Exercise 8 Posted

Today's exercise problem has been posted on the Moodle page.

OS Exercise 7 posted

Today's exercise problem has been posted on the Moodle page.

If you are interested in working on the extra credit problem(s), please talk to the instructor by the end of 2nd period. Otherwise, you will only receive the points for the basic implementations.

OS Exercise 3 Graded

Exercise 3 of the Operating Systems class have been graded and posted on the Moodle system. The grading criteria are as follows:

• Data input (1pt)
• Thread creation (3pts)
• div_thread implementation (2pts)
• print_results (1pt)

The total points (7pts) are converted into 100% and posted on the Moodle.

OS Deadlines of Exercises 5 and 6 Extended

The submission deadlines of Exercises 5 and 6 have been extended:

• Exercise 5: by 11/16 (Wed) at 0000 (or by the end of 11/15)
• Exercise 6: by 11/16 (Wed) at 1440 (at the end of 3rd period)

Any question ? Ask the instructor.

OS Exercise 2 Graded

You can find the grade of your Exercise 2 submission on Moodle. The grading criteria are

• Each operation (bullet) of the processes is counted as 1pt
• Exceptions are spawning (creating) a child process and wait for another process to finish, these are counted as 2pts.
• The total is 26pts and then the grade is converted to 100pts scale.

If you have any question, please contact the instructor or the assistant.

OS Exercise 6 posted

Today's exercise problem has been posted on the Moodle page.

OS Exercise 1 graded

You must have received notification that the grading of Exercise 1 was finished. Typical mistakes include

• incorrect counting of the number of words
• incorrect handling of the case where two options are used (-u -c)

If you have further questions, please contact the instructor or the course assistant.

OS Exercise 5 posted

Today's exercise problems have been posted on the Moodle system. Write your answers in a pdf file and submit by the deadline. During today's class (5th and 6th periods), you may also ask questions on Exercise 4, which is due next Tuesday.