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15:41, 5 April 2023 Soma talk contribs created page DistOS 2023W 2023-04-05 (Created page with "==Class Discussion== For class discussion today: * What did we learn this semester? * Specifically, what are the big ideas, the patterns we covered? ==Notes== <pre> </pre>")
15:47, 3 April 2023 Soma talk contribs created page DistOS 2023W 2023-04-03 (Created page with "==Notes== <pre> Spanner & Tensorflow -------------------- Last two papers! April 5th - class wrap-up discussion, exam review April 10 & 12 - project presentations Spanner - big, distributed SQL database (mostly) - at Google - compare with Bigtable, Dynamo (NoSQL systems) - what is the difference in functionality? - why does it matter? - HOW?! what is the "neat trick"? - has to do with time, but why? - to what degree is Spanner a full relational database, l...")
22:05, 31 March 2023 Soma talk contribs created page Mobile Apps 2023W Lecture 22 (Created page with "==Code== <syntaxhighlight lang="kotlin" line> package carleton.comp2601.webviewcompose import android.os.Bundle import android.util.Log import android.view.ViewGroup import android.webkit.WebResourceRequest import android.webkit.WebView import android.webkit.WebViewClient import androidx.activity.ComponentActivity import androidx.activity.compose.setContent import androidx.compose.foundation.layout.Row import androidx.compose.foundation.text.ClickableText import androi...")
03:26, 30 March 2023 Soma talk contribs created page Mobile Apps 2023W Lecture 21 (Created page with "==Notes== <pre> March 29 -------- So I'm trying to figure out how to implement the back button properly. Currently, the back button gets triggered but doesn't work right, .goBack() isn't doing what we expected - hypothesis: state changes are updating history too often, getting copies of current page and so can't keep track of last page properly Two choices: - integrate more tightly with webview history so we can better manipulate and interact with it - ignore webv...")
15:48, 29 March 2023 Soma talk contribs created page DistOS 2023W 2023-03-29 (Created page with "==Notes== <pre> Haystack & f4 ------------- - What problem does Haystack solve? What problem does f4 solve? - How does Haystack work? How does f4 work? - what behavior patterns are needed to make Haystack and f4 work well? - how grounded are these patterns in human behavior? - What is the relationship between Haystack and f4? - What are the key technical insights used to build these systems? - To what degree could these systems be used for other tasks? We'l...")
15:52, 27 March 2023 Soma talk contribs created page DistOS 2023W 2023-03-27 (Created page with "==Notes== <pre> Zookeeper & Delos ----------------- Consensus - why is this such an important problem in distributed OS? Notice that consensus isn't a concern in single-system operating systems - we get "consensus" simply by having one copy of data But in a distributed system we have copies of data & distributed state - so if we want all of the system to be in the "same" state, we need consensus - consensus has to be constructed, it isn't the natural state of the...")
21:15, 24 March 2023 Soma talk contribs created page Mobile Apps 2023W Lecture 20 (Created page with "==Code== <syntaxhighlight lang="kotlin" line> package carleton.comp2601.webviewcompose import android.os.Bundle import android.util.Log import android.view.ViewGroup import android.webkit.WebView import android.webkit.WebViewClient import androidx.activity.ComponentActivity import androidx.activity.compose.setContent import androidx.compose.foundation.layout.Row import androidx.compose.foundation.text.ClickableText import androidx.compose.material.* import androidx.com...")
21:13, 22 March 2023 Soma talk contribs created page Mobile Apps 2023W Lecture 19 (Created page with "==Notes== <pre> March 22 -------- Integrating webview with HNTree we have composable functions that we can copy over, but how should the app actually work? Should start up as a web browser with a URL bar, with a button to the side of the URL bar that says "History". Clicking on the button will switch the view to the History view. If the user taps on a specific past URL, visit the page (potentially with confirmation) What's the strategy? - first, change the webvie...")
15:33, 22 March 2023 Soma talk contribs created page DistOS 2023W 2023-03-22 (Created page with "==Discussion Questions== * What problems are Cassandra and Dynamo built to solve? How do these problems inform their design? * What are the key technical insights or algorithms behind Cassandra and Dynamo? * What infrastructure do Cassandra and Dynamo seem to rely on? How does this compare with the systems made by Google?")
06:50, 22 March 2023 Lianyingzhao talk contribs created page COMP3000 Operating Systems W23: Tutorial 9 (Created page with "By the end of this tutorial, you will have a basic familiarity with the Docker platform and be able to run, operate, and customize containers, and create simple containers of your own. You will see how kernel building blocks like namespaces make containers possible. ==General Instructions (same for all tutorials)== <div class="mw-collapsible mw-collapsed"> Click on Expand to view. <div class="mw-collapsible-content"> Tutorials are graded based on participation and effo...")
03:46, 21 March 2023 Soma talk contribs created page DistOS 2023W 2023-03-20 (Created page with "==Notes== <pre> March 20 -------- Project Proposals - if you want to re-submit, you can, and I will replace the grade with your new one - Need to finish it by March 27th - some proposals were just way too broad - need to narrow it down - some were too focused on one paper - needs to cover multiple papers - some tried to argue for a technical point - you aren't doing original research - focus on what the papers say, have a thesis about patterns...")
20:52, 17 March 2023 Soma talk contribs created page Mobile Apps 2023W Lecture 18 (Created page with "==Code== ===MainActivity.kt=== <syntaxhighlight lang="kotlin" line> package carleton.comp2601.historyviewer import android.net.Uri import android.os.Bundle import android.util.Log import androidx.activity.ComponentActivity import androidx.activity.compose.setContent import androidx.compose.foundation.layout.fillMaxSize import androidx.compose.foundation.lazy.LazyColumn import androidx.compose.material.MaterialTheme import androidx.compose.material.Surface import andro...")
20:00, 15 March 2023 Soma talk contribs created page Mobile Apps 2023W Lecture 17 (Created page with "==Code== <syntaxhighlight lang="kotlin" line> package carleton.comp2601.historyviewer class HNTree { var hostComponent: String = "" var hostSuffix: String = "" var parent: HNTree = this var children: MutableList<HNTree> = mutableListOf() var treeLevel: Int = 0 var expanded: true fun add(hostPrefix: String) { var allComponents: List<String> var component: String var child: HNTree? = null /* still have to deal...")
15:44, 15 March 2023 Soma talk contribs created page DistOS 2023W 2023-03-15 (Created page with "==Notes== <pre> Bigtable & MapReduce -------------------- When you think about BigTable, focus on figure 1 (to understand what it is doing) and Figure 4 (to understand how). Remember that GFS requires structured information to be stored (because data can be duplicated), BigTable is one of the ways GFS files can be organized To what extent is BigTable a database? For MapReduce, think about the kind of tasks Google wanted to perform on its web crawls - generating an...")
04:12, 14 March 2023 Lianyingzhao talk contribs created page COMP3000 Operating Systems W23: Tutorial 8 (Created page with "In this tutorial, you’ll be learning about how virtual addresses are mapped to physical addresses (the address translation) and continue to use kernel modules to extract information that only the kernel has access to. In particular, the kernel module performs a 5-level page table walk to find out the physical address corresponding to a userspace virtual address. In addition to what was discussed in the class, You can also read [https://en.wikipedia.org/wiki/Intel_5-lev...")
15:35, 13 March 2023 Soma talk contribs created page DistOS 2023W 2023-03-13 (Created page with "==Discussion Questions== * List all the terms and acronyms in the Ceph paper and discus their meaning and relationship with each other. * To what degree is Ceph POSIX compliant? Is there a cost for this? * Discuss Figures 1-3 in Crush, what does each say?")
22:16, 10 March 2023 Soma talk contribs created page Mobile Apps 2023W Lecture 16 (Created page with "==Notes== <pre> March 10 -------- I have a hostname, want to insert it into the current HNTree - split the hostname into a bunch of components (www, carleton, ca) First, initially, we'll create a root node representing . (top of the DNS hierarchy). So that should get its own dedicated constructor. Then we'll have an add operation which will take a hostname, and it will add child hostnames add will split the hostname into its components, see if the last-most su...")
04:43, 9 March 2023 Soma talk contribs created page Mobile Apps 2023W Lecture 15 (Created page with "==Notes== <pre> March 8 ------- Last time, we were talking about how to store web browser history so we can view it in interesting ways. class HostPart { value: String, expanded: bool, higher: HostPart?, can be undefined: lower: HostPart? } .ca .carleton .google www brightspace www mail sheets class HNTree { hostComponent: String, /* <-- "carleton" in "www.carleton.ca"...")
19:02, 8 March 2023 Soma talk contribs created page Mobile Apps 2023W Lecture 14 (Created page with "==Notes== <pre> March 3 ------- I want to build a browser history viewer. It will allow surfing history to be viewed in a few ways: - list of pages visited (easy, dump stored history) - list "sessions" - group by what is first entered in the URL bar, whether it be a search or a direct entry of a URL - show as a grouped list (with each session collapsable) - show time of start of session, time of each subsequent request (potentially hide times)...")
18:17, 8 March 2023 Soma talk contribs created page DistOS 2023W 2023-03-08 (Created page with "No in-class notes, see class video on Brightspace/Zoom.")
05:59, 8 March 2023 Lianyingzhao talk contribs created page COMP3000 Operating Systems W23: Tutorial 7 (Created page with "In this tutorial you'll be learning about special files and Linux kernel modules, part of which are device drivers. You’ll create several kernel modules and see how to interact with device drivers using special files (e.g., character device) and their file operations as an interface. ==General Instructions (same for all tutorials)== <div class="mw-collapsible mw-collapsed"> Click on Expand to view. <div class="mw-collapsible-content"> Tutorials are graded based on pa...")
05:53, 8 March 2023 Lianyingzhao talk contribs created page COMP3000 Operating Systems W23: Tutorial 7 Not Using SCS OpenStack (Created page with "If you are not using our course VM for some reason, you might encounter problems and you can refer to the instructions below. Although they are by no means comprehensve to solve the problems, they can in many cases and serve as pointers about where to look. ==Modules fail to build== If you see errors (not just warnings) after running <tt>make</tt> and no <tt>.ko</tt> file is produced, you may have installed a version of Ubuntu that is too minimal. But you can fix it by i...")
16:48, 6 March 2023 Soma talk contribs created page DistOS 2023W 2023-03-06 (Created page with "==Notes== <pre> NASD & Tapestry --------------- What problem(s) is NASD designed to solve? What's the standard architecture for a file server? - you have a server with attached storage - that server reads storage then sends what it reads over the network to a client Limitations of this approach - bandwidth bottleneck on the server: reading lots of disks in parallel only to copy to memory then send over the network puts huge strain on server memory system - also l...")
04:52, 2 March 2023 Soma talk contribs created page Mobile Apps 2023W Lecture 13 (Created page with "==Notes== <pre> Android Architecture & Security ------------------------------- * I've graded all proposals * On Friday, progress report 3 is due * If you have something to demo, please demo in Friday! What is running on an Android device? How does it compare to a regular Linux system? Android documentation uses lots of Android-specific jargon, not at all clear how it maps to more normal concepts. So I'm going to try explaining that here. First, Android runs on L...")
16:38, 1 March 2023 Soma talk contribs created page DistOS 2023W 2023-03-01 (Created page with "==Discussion Questions== OceanStore * What is the threat model underlying OceanStore security? * How does this compare to the threat model of modern cloud storage providers? * Would you use OceanStore? Why or why not? BOINC * What was the original inspiration for this work? * What kind of problems is this style of computing suitable for? What problems is it not suitable for? * What is the threat model for BOINC-type systems? Does this threat model make it suitable o...")
06:26, 1 March 2023 Lianyingzhao talk contribs created page COMP3000 Operating Systems W23: Tutorial 6 (Created page with "In this tutorial you will be learning about two implementations of the [https://en.wikipedia.org/wiki/Producer%E2%80%93consumer_problem producer-consumer problem], a classic example of a concurrency problem. The [http://pages.cs.wisc.edu/~remzi/OSTEP/ class textbook] covers concurrency in great detail in Chapters 25-34, and the producer-consumer problem is covered in [http://pages.cs.wisc.edu/~remzi/OSTEP/threads-cv.pdf Chapter 30 (Condition Variables)] and [http://pages...")
17:56, 27 February 2023 Soma talk contribs created page DistOS 2023W 2023-02-27 (Created page with "==Notes== <pre> Web Scale --------- * Midterm grading is ongoing, hopefully will be finished this week * Proposal deadline extended to Friday, will try to give you some material this week to help - I've been ignoring some of you on Teams, I will be replying today Up to this point in the class, we've really been focused on distributed systems for running classic UNIX-like workloads - individual developer/engineer working at a workstation on their stuff Key problems...")
19:47, 17 February 2023 Soma talk contribs created page Mobile Apps 2023W Lecture 12 (Created page with " ==Code== <syntaxhighlight lang="kotlin" line> package carleton.comp2601.scrolldemo import android.os.Bundle import androidx.activity.ComponentActivity import androidx.activity.compose.setContent import androidx.compose.foundation.layout.* import androidx.compose.foundation.lazy.LazyColumn import androidx.compose.foundation.lazy.rememberLazyListState import androidx.compose.material.* import androidx.compose.runtime.Composable import androidx.compose.ui.Alignment impor...")
19:40, 15 February 2023 Soma talk contribs created page Mobile Apps 2023W Lecture 11 (Created page with "Learning materials * https://developer.android.com/codelabs/basic-android-kotlin-training-sql-basics * https://developer.android.com/codelabs/basic-android-kotlin-training-intro-room-flow")
18:18, 13 February 2023 Soma talk contribs created page DistOS 2023W 2023-02-13 (Created page with "==Notes== <pre> COMP 4000/5102 Midterm Review ----------------------------- Potential questions * What was the vision of the creators of UNIX at Bell Labs? How did later systems violate that vision, and how did later systems from Bell Labs try to return to it? * How has the abstraction of files changed in the context of early distributed operating systems? What is a "file" in different contexts? Why has it changed? * How has the abstraction of volatile memory cha...")
21:36, 10 February 2023 Soma talk contribs created page Mobile Apps 2023W Lecture 10 (Created page with "==Notes== <pre> February 10 ----------- Web browser with history visualization/query - understand what pages I've been visiting Potential screens: - basic web browser (where user will spend most of their time) - history viewer (text) - history viewer (graphical) How do we display web history? - basic chronological - time, web page, title Potential tasks - what websites do I visit the most? - what topics do I read about? - what authors do I read? - conn...")
21:02, 8 February 2023 Soma talk contribs created page Mobile Apps 2023W Lecture 9 (Created page with "==Notes== <pre> Lecture 9 --------- Key challenge this semester is design as much as implementation So...I'm going to design and build an app, and walk you all through it What websites have I been visiting? - I visit all kinds of places - I don't make bookmarks - yes there is history, but it isn't easy to view - would love the browser to eventually help direct my browsing towards things I, at a high level, want to visit rather than what is most easily in "reach...")
16:47, 8 February 2023 Soma talk contribs created page DistOS 2023W 2023-02-08 (Created page with "==Notes== <pre> Plan 9 & Inferno ---------------- Remember that UNIX was created before the Internet, and was used to develop the Internet Plan 9 is the work of the original UNIX creators to try and make UNIX work on multiple computers that are connected via a network Discussion questions: - how is the design philosophy of UNIX reflected in Plan9? Has that vision changed? - what mechanisms did they create? Compare pipes and P9P for example Inferno was a response...")
16:17, 6 February 2023 Soma talk contribs created page DistOS 2023W 2023-02-06 (Created page with "==Discussion questions== * Discuss what you think was interesting about Sprite relative to past systems. What was new? What was old? * How does AFS compare to NFS, in terms of their design, implementation, and ambition? * What is the role of UNIX in the design and implementation of Sprite and AFS? * What else came to mind when reading and discussing these papers?")
18:58, 3 February 2023 Soma talk contribs created page Mobile Apps 2023W Lecture 8 (Created page with "==Resources== Documentation: * [https://google.github.io/volley/ Volley] * [https://www.weatherbit.io/ Weatherbit] - create an account, sign up for the free plan Tutorials (From GeeksforGeeks.org): * [https://www.geeksforgeeks.org/volley-library-in-android/ Volley Tutorial] * [https://www.geeksforgeeks.org/how-to-build-a-weather-app-in-android/ Weather App Tutorial]")
06:53, 2 February 2023 Lianyingzhao talk contribs created page COMP3000 Operating Systems W23: Tutorial 5 (Created page with "In this tutorial you will be learning about files and filesystems by experimenting with and extending [https://people.scs.carleton.ca/~lianyingzhao/comp3000/w23/tut5/3000test.c 3000test.c], and creating and manipulating local filesystems. '''WARNING:''' Several of the commands here can lead to system corruption and data loss if not properly used. You have been warned. Please use a VM and make backups, when necessary. '''Note: there are two parts of Tasks/Questions, Part...")
03:21, 2 February 2023 Soma talk contribs created page Mobile Apps 2023W Lecture 7 (Created page with "==Notes== <pre> Lecture 7 --------- For next time: doing HTTP requests & getting responses, working with REST APIs in Android and Kotlin Today: Processes & Threads in Android A process is a running program on UNIX/Linux (and Windows) - has its own share of memory and CPU resources - isolated from the rest of the system (cannot see the memory of other processes) The CPU runs a process for a while then switches to running other processes - the OS scheduler in the...")
19:11, 1 February 2023 Soma talk contribs created page DistOS 2023W 2023-02-01 (Created page with "==Notes== <pre> LOCUS & NFS notes ----------------- NFS: file servers & file clients (few servers, many clients) - files live on the servers LOCUS: every computer has files, not all files are on all computers - so each computer could be a server or a client - or just have local access could have replicas but logically should act like one file - so replicas have to by synchronized - did centralized sync via a designated host - all updates would go there, and th...")
16:34, 30 January 2023 Soma talk contribs created page DistOS 2023W 2023-01-30 (Created page with "==Discussion Questions== * Why do RPCs require data to be copied? * Why is transparency important? Do you think it is still important? * How does SUN's RPC compare to that described by Nelson? * Why did SUN make its own RPC mechanism? * What are alternatives to RPC? * Do you think RPCs are good for security? Why or why not?")
20:05, 27 January 2023 Soma talk contribs created page Mobile Apps 2023W Lecture 6 (Created page with "==Resources== * [https://developer.android.com/jetpack/compose/interop/interop-apis Interoperability APIs in Compose] * [https://developer.android.com/develop/ui/views/layout/webapps/webview Build web apps in WebView]")
19:08, 25 January 2023 Soma talk contribs created page Mobile Apps 2023W Tutorial 2 (Created page with "==Tasks== For this tutorial you should port RemotePicViewer from [https://homeostasis.scs.carleton.ca/wiki/index.php/Mobile_App_Dev_2022W:_Tutorial_4 Tutorial 4 of COMP 1601] to Android & Jetpack Compose. Note that you'll want to start with a local image resource, then try to integrate a remote image loading library. See the recent lectures for relevant code.")
16:30, 25 January 2023 Soma talk contribs created page DistOS 2023W 2023-01-25 (Created page with "==Discussion Questions== * What is the dream of DSM? * What makes DSM hard? * Why can't we have a general solution to DSM? * Do you think we use DSM today? Why or why not? * What is unclear or confusing about DSM & the readings?")
04:59, 24 January 2023 Lianyingzhao talk contribs created page COMP3000 Operating Systems W23: Tutorial 4 (Created page with "In this tutorial, you will learn about how user accounts and logging in work through exploring [https://people.scs.carleton.ca/~lianyingzhao/comp3000/w23/tut4/3000userlogin.c 3000userlogin.c]. You’ll also have a better understanding of the permission system and the shell/terminal environment. ==General Instructions (same for all tutorials)== <div class="mw-collapsible mw-collapsed"> Click on Expand to view. <div class="mw-collapsible-content"> Tutorials are graded ba...")
16:36, 23 January 2023 Soma talk contribs created page DistOS 2023W 2023-01-23 (Created page with "==Discussion questions== Remember, these are just to get you started. Please allow your discussion to go where it will, so long as it is somewhat related to the readings. * How distributed was the Mother of All Demos? * How distributed was the Alto? * How do these systems relate to the topics of this class? * What did you find interesting? Surprising? * Are there any ideas here that seem promising but we've "forgotten" about?")
06:28, 22 January 2023 Lianyingzhao talk contribs created page COMP3000 Operating Systems W23: Tutorial 3 (Created page with "In this tutorial, you will be experimenting with and extending [https://people.scs.carleton.ca/~lianyingzhao/comp3000/w22/tut3/3000shell.c 3000shell.c], a proof-of-concept program to show you how a Linux shell works. Also, you will be learning to read and modify C code, which prepares you for subsequent tutorials and assignments. ==General Instructions (same for all tutorials)== <div class="mw-collapsible mw-collapsed"> Click on Expand to view. <div class="mw-collapsib...")
20:15, 20 January 2023 Soma talk contribs created page Mobile Apps 2023W Lecture 4 (Created page with "==Resources== * [https://developer.android.com/jetpack/compose/graphics/images/loading Loading images in Compose] * [https://developer.android.com/jetpack/compose/gestures#dragging Drag gestures in compose]")
17:27, 20 January 2023 Soma talk contribs created page Mobile Applications (Winter 2023) Project Guidelines (Created page with "This page contains guidelines on the class project. This page will be updated based on questions and feedback. ==Project Proposal== Your project proposal should be a relatively short document describing what you plan to do for your project. You should propose to make an original app of some kind. Make sure you propose to do something that you can complete this semester. It is fine to have optional extensions that you add if you have time; the basic app, however, sh...")
19:12, 18 January 2023 Soma talk contribs created page DistOS 2023W 2023-01-18 (Created page with "==Notes== <pre> Lecture 4 --------- Ideas/thoughts from group discussion on Unix - simpler, cheaper than Multics - pipes were there at the beginning and still are used - oldest form of IPC - much less emphasis on security than now (no ASLR!) - built to be modular, easy to enhance, change - programming-friendly environment - software as composition - invented inodes, had a filesystem hierarchy (which as pretty new) - kernel, shell, utilities, interesting spl...")
19:09, 18 January 2023 Soma talk contribs created page Mobile Apps 2023W Tutorial 1 (Created page with " ==Code== ===MainActivity.kt=== <syntaxhighlight lang="kotlin" line> package carleton.comp2601.textanalyzer7 import android.os.Bundle import androidx.activity.ComponentActivity import androidx.activity.compose.setContent import androidx.compose.foundation.layout.* import androidx.compose.material.* import androidx.compose.runtime.* import androidx.compose.ui.Alignment import androidx.compose.ui.Modifier import androidx.compose.ui.text.font.FontWeight import androidx.c...")
03:03, 17 January 2023 Lianyingzhao talk contribs created page COMP3000 Operating Systems W23: Downloading files from your Openstack VM (Created page with "You will need to transfer files between the Openstack VM and your own PC from time to time, for example, when submitting your tutorial/assignment work. As your laptop/desktop does not have a fixed IP the VM can connect to, it is always better to initiate the connection from your PC to the VM, which has a floating IP address associated. Here, you have a few options depending on your situation. Choose one that works for you or feel free to use other alternatives. ==Using...")