Computer Systems Fundamentals
Fall, 2020 (3 credits, E)
Revised 9/14/2020 — late days policy has been updated, CA list updated
Revised 11/28/2020 — CA list updated
Instructor
Office: Malone 337
Office hours: T/Th 1–3pm EDT (see Piazza for office hours URL)
Course Assistants
Head CAs:
- Rebecca Yu ryu16@jhu.edu
- Eric Rong erong1@jhu.edu
CAs:
- Adyant Balaji abalaji2@jhu.edu
- Alison Lee alee231@jhu.edu
- Charissa Zou czou9@jh.edu
- Dikshith (Bannu) Kasimahanthi dkasima1@jhu.edu
- Jason Kurlander jkurlan3@jhu.edu
- Ryan Rubel rrubel1@jhu.edu
- Simon Allocca sallocc1@jh.edu
- Yunxiao (Gary) Yang yyang117@jhu.edu
- Shravan Venkatesan svenka16@jhu.edu
- David Skaff dskaff1@jhu.edu
Meeting
Section 01: MWF 9:00–9:50 am
Section 02: MWF 10:00–10:50 am
Class meetings will be held virtually via Zoom. See Piazza for URLs.
Textbook
Recommended: Bryant and O’Halloran, Computer Systems: A Programmer’s Perspective, 3rd ed.
Optional: Computer Organization and Design (MIPS edition)
Online Resources
Lecture notes, assignments, and public information about the course will be posted on the course website, https://jhucsf.github.io/fall2020. You should check the course website frequently.
Piazza (announcements, discussion): https://piazza.com/jhu/fall2020/601229
Gradescope (assignment/exam submission and grading): https://www.gradescope.com
Videos will be posted on Blackboard: go to http://my.jhu.edu, log in, choose Education → Blackboard, choose EN.601.229 from courses, then choose Panopto
Course Information
- The course is about computer systems from the programmer’s perspective. We’ll be making a fairly deep dive into topics such as data representation, memory, assembly language, CPU architecture, networks, and concurrency. By the end of the course you’ll know a lot about how modern computers really work and how to take advantage of their advanced features.
- Prerequisites
Intermediate Programming (EN.601.220) - Required
Course Goals
By the end of the course you will
- Understand machine data types and arithmetic
- Be able to understand and write assembly language programs
- Understand machine-level memory organization
- Understand some types of machine-level security vulnerabilities and how to avoid introducing them
- Understand memory hierarchies
- Understand architectural features of modern processors, and how to optimize code for efficient execution
- Understand how linkers enable the creation of executables from separately-compiled modules
- Understand dynamic linking and run-time loading of shared objects
- Understand process address space layout
- Understand virtual memory translation hardware and how it is used for memory isolation and sharing
- Understand basic principles of computer networking
- Use networking APIs such as sockets to implement network applications
- Use concurrency using abstractions such as threads
This course will address the following Criterion 3 Student Outcomes:
Graduates of the program will have an ability to:
2) Design, implement, and evaluate a computing-based solution to meet a given set of computing requirements in the context of the programs discipline.
Course Topics
- Machine-level data representation
- Computer architecture
- Assembly-language programming
- Performance optimization
- Memory hierarchy and caching
- Virtual memory
- Networks
- Concurrency
Course Expectations & Grading
Class meetings will consist of lecture and discussion, interspersed with in-class activities.
Your course grade will be determined as follows:
- Programming assignments: 55%
- Exams: 40% (4 exams, each worth 10%)
- Activities/quizzes: 5%
You have a total of 7 late days to use as needed for homework assignments throughout the course, with the caveat that you may use at most 5 late days on any single assignment. Each 24 hour period following an assignment deadline is considered to be one late day: for example, if an assignment is due at 11pm on Friday, but you submit your assignment at 11:30pm on Friday, you have used one late day. If you are planning on using more than two late days on an assignment, please send a private message to the instructors on Piazza to let us know. Assignment submissions which exceed the maximum number of late days will (generally) not be considered for credit. Having said that, we understand that exceptional circumstances can arise. If you are in a situation where you think you may need additional late days, please notify your instructor.
Key Dates
The Schedule lists exam dates.
The Assignments page lists assignments and their due dates.
Assignments & Readings
The Schedule lists the topics and readings for each day.
The course’s Blackboard page (under Panopto) hosts the lecture videos.
Ethics
The strength of the university depends on academic and personal integrity. In this course, you must be honest and truthful, abiding by the Computer Science Academic Integrity Policy:
Cheating is wrong. Cheating hurts our community by undermining academic integrity, creating mistrust, and fostering unfair competition. The university will punish cheaters with failure on an assignment, failure in a course, permanent transcript notation, suspension, and/or expulsion. Offenses may be reported to medical, law or other professional or graduate schools when a cheater applies.
Violations can include cheating on exams, plagiarism, reuse of assignments without permission, improper use of the Internet and electronic devices, unauthorized collaboration, alteration of graded assignments, forgery and falsification, lying, facilitating academic dishonesty, and unfair competition. Ignorance of these rules is not an excuse.
Academic honesty is required in all work you submit to be graded. Except where the instructor specifies group work, you must solve all homework and programming assignments without the help of others. For example, you must not look at anyone else’s solutions (including program code) to your homework problems. However, you may discuss assignment specifications (not solutions) with others to be sure you understand what is required by the assignment.
If your instructor permits using fragments of source code from outside sources, such as your textbook or on-line resources, you must properly cite the source. Not citing it constitutes plagiarism. Similarly, your group projects must list everyone who participated.
Falsifying program output or results is prohibited.
Your instructor is free to override parts of this policy for particular assignments. To protect yourself: (1) Ask the instructor if you are not sure what is permissible. (2) Seek help from the instructor, TA or CAs, as you are always encouraged to do, rather than from other students. (3) Cite any questionable sources of help you may have received.
On every exam, you will sign the following pledge: “I agree to complete this exam without unauthorized assistance from any person, materials or device. [Signed and dated]”. Your course instructors will let you know where to find copies of old exams, if they are available.
Report any violations you witness to the instructor.
You can find more information about university misconduct policies on the web at these sites:
- For undergraduates: http://e-catalog.jhu.edu/undergrad-students/student-life-policies/
- For graduate students: http://e-catalog.jhu.edu/grad-students/graduate-specific-policies/
Personal Wellbeing
- If you are sick please notify me by email so that we can make appropriate accommodations should this affect your ability to attend class, complete assignments, or participate in assessments. The Student Health and Wellness Center is open and operational for primary care needs. If you would like to speak with a medical provider, please call 410-516-8270, and staff will determine an appropriate course of action based on your geographic location, presenting symptoms, and insurance needs. Telemedicine visits are available only to people currently in Maryland. See also https://studentaffairs.jhu.edu/student-life/student-outreach-support/absences-from-class/illness-note-policy/
- The Johns Hopkins COVID-19 Call Center (JHCCC), which can be reached at 833-546-7546 seven days a week from 7 a.m. to 7 p.m., supports all JHU students, faculty, and staff experiencing COVID-19 symptoms. Primarily intended for those currently within driving distance of Baltimore, the JHCCC will evaluate your symptoms, order testing if needed, and conduct contact investigation for those affiliates who test positive. More information on the JHCCC and testing is on the coronavirus information website.
- All students with disabilities who require accommodations for this course should contact me at their earliest convenience to discuss their specific needs. If you have a documented disability, you must be registered with the JHU Office for Student Disability Services (385 Garland Hall; 410-516-4720; http://web.jhu.edu/disabilities/) to receive accommodations.
- Students who are struggling with anxiety, stress, depression or other mental health related concerns, please consider connecting with resources through the JHU Counseling Center. The Counseling Center will be providing services remotely to protect the health of students, staff, and communities. Please reach out to get connected and learn about service options based on where you are living this fall at 410-516-8278 and online at http://studentaffairs.jhu.edu/counselingcenter/.
- Student Outreach & Support will be fully operational (virtually) to help support students. Students can self-refer or refer a friend who may need extra support or help getting connected to resources. To connect with SOS, please email deanofstudents@jhu.edu, call 410-516-7857, or students can schedule to meet with a Case Manager by visiting the Student Outreach & Support website and follow “Schedule an Appointment”.
Classroom Climate
As your instructor, I am committed to creating a classroom environment that values the diversity of experiences and perspectives that all students bring. Everyone here has the right to be treated with dignity and respect. I believe fostering an inclusive climate is important because research and my experience show that students who interact with peers who are different from themselves learn new things and experience tangible educational outcomes. Please join me in creating a welcoming and vibrant classroom climate. Note that you should expect to be challenged intellectually by me, the TAs, and your peers, and at times this may feel uncomfortable. Indeed, it can be helpful to be pushed sometimes in order to learn and grow. But at no time in this learning process should someone be singled out or treated unequally on the basis of any seen or unseen part of their identity.
If you ever have concerns in this course about harassment, discrimination, or any unequal treatment, or if you seek accommodations or resources, I invite you to share directly with me or the TAs. I promise that we will take your communication seriously and to seek mutually acceptable resolutions and accommodations. Reporting will never impact your course grade. You may also share concerns with the department/center chair/head/director (Randal Burns, randal@cs.jhu.edu), the Director of Undergraduate Studies (Joanne Selinski, joanne@cs.jhu.edu), the Assistant Dean for Diversity and Inclusion (Darlene Saporu, dsaporu@jhu.edu), or the Office of Institutional Equity (oie@jhu.edu). In handling reports, people will protect your privacy as much as possible, but faculty and staff are required to officially report information for some cases (e.g. sexual harassment).
Family Accommodations Policy
You are welcome to bring a family member to class on occasional days when your responsibilities require it (for example, if emergency child care is unavailable, or for health needs of a relative). In fact, you may see my children in class on days when their school is closed. Please be sensitive to the classroom environment, and if your family member becomes uncomfortably disruptive, you may leave the classroom and return as needed.
University Policy on Incompletes
The university recognizes that the Fall 2020 semester is surrounded with uncertainty and many students may find themselves in unexpected situations where study is difficult if not impossible. Students who are confronted with extraordinary circumstances that interfere with their ability perform their academic work may request an incomplete grade from the instructor. While approval of such a request is not automatic, it is expected that faculty will make every effort to accommodate students dealing with illness in the family and other pandemic-related hardships. The instructor and student must establish a timetable for submitting the unfinished work with a final deadline no later than the end of the third week of the Spring 2021 semester (February 12, 2021). Exceptions to this deadline require a petition from the instructor to the student’s academic advising office by February 12, 2021. When entering an Incomplete grade in SIS, faculty must include a reversion grade which represents the grade the student will receive if s/he does not complete the missing work by the agreed-upon deadline.
Deadlines for Adding, Dropping and Withdrawing from Courses
Students may add a course up to September 11, 2020. They may drop courses up to October 12, 2020 provided they remain registered for a minimum of 12 credits. Between October 12 and November 13, 2020, a student may withdraw from a course with a W on their academic record. A record of the course will remain on the academic record with a W appearing in the grade column to indicate that the student registered and then withdrew from the course.
For more information on these and other academic policies, see https://e-catalogue.jhu.edu/engineering/full-time-residential-programs/undergraduate-policies/academic-policies/grading-policies/