CS Operating system

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1 Name / ID (please PRINT) Seq#: Seat Number CS Operating system Spring Midterm II -- April 13, 2017 You have 75 min. Good Luck! This is a closed book/note examination. But You can use 2-page C reference card given to you. This exam has 5 questions in 6 pages. Please read each question carefully and answer all the questions, which have 100 points in total. Feel free to ask questions if you have any doubts about questions. Partial credit will be given, so do not leave questions blank. You can get 2pt bonus credit if you complete the following three survey questions and the boldfaced two columns of the grading table below. Please do this after answering the questions in the exam. Thanks! Survey Questions (circle one): Did you take Data Structures from CS-UTSA? Yes No What grade you got: A B C Did you take System Prog. from CS-UTSA? Yes No What grade you got: A B C Did you take Computer Org. from CS-UTSA? Yes No What grade you got: A B C Did you take Application Prog. from CS-UTSA? Yes No What grade you got: A B C Possible Question Topic Points 1 Memory Management 20 Page/frame bits, table size, and page table design 2 Memory Management 20 Memory address translation and TLB 3 Virtual Memory - 20 Page replacement 4 Threads 20 Parameter passing 5 Synchronization 20 Difficulty level of this question 1: Easiest 5: Most difficulty Student Expects to receive out of 20 Student Received out of 20 Bonus if this table is completed 2 Total

2 1. [20 points] Memory Management/Design: A. [10 points] Assume a machine has a 16-bit virtual address space and is byte-addressable. The physical memory is 8K bytes (2^13) and the page/frame size is 256 bytes (2^8). Give the best answer to each of the following with a short justification. If you need to make additional assumptions to give an answer, state the assumptions that you are making [Note: if the answer is a power of 2, leave it in exponential form.] a. [0.5pt] How many bits are used for the page offset? b. [0.5pt] How many bits of virtual address are used for page number? c. [0.5pt] How many pages are in a process virtual address space? d. [0.5pt] How many bits of physical address are used for frame offset? e. [2pt] How many bits of physical address are used for frame number? f. [2pt] How many frames are in the physical memory? g. [2pt] How many bytes would be needed for a page table entry? h. [2pt] How many bytes would be needed for a page table of a process? B. [10 points] For the previous problem (1.A), suppose we want to use an inverted page table: a. [5pt] Determine the size of the inverted page table (show/explain the number/meaning of bits) b. [5pt] Explain why (or why not) you would use the inverted page table in this system instead of the conventional page table given in 1.A. 2

3 2. [20 points] Memory address translation and TLB performance: Suppose that TLB has an access time of 4 ns and the memory access time is 22 ns. The disk access time is 10 ms. Suppose that the page/frame size is 256 bytes. The virtual address space is 16 bits and the physical memory address is 14 bit. The entire TLB and the beginning of the page table are given below. For each of the virtual address given in binary below, find the corresponding page number and estimate the time to access the memory location. Also give the corresponding frame number and physical memory address. [Notes: 1 second = 1000 ms; and 1 ms = 1000 ns.] initial page table TLB index valid Frame Page Frame Logical/virtual address Page # Access time Frame # Physical Address - bitwise (2pt) (8pt) (2pt) (8pt)

4 3. [20 points] Page replacement: consider a demand paged virtual memory system with 3 frames allocated to a process. Assume that initially no frames are allocated to any pages and the process will make the following sequence of page references: For each of the following page replacement algorithms, indicate which pages are in memory after each reference and determine which references produce page faults. Circle the page faults. For each algorithm, also give the total number of page faults. a) [5pt] FIFO, number of page faults = Page reference b) [7pt] LRU, number of page faults = Page reference c) [8pt] Optimal, number of page faults = Page reference

5 4. [20 points] Threads (parameter passing): Complete the following program which creates 5 copies of a thread with different parameters. Specifically, the thread gets a character (ch), an integer number (n), and a double value (d) as parameters. Then the thread simply outputs the given character, integer number, and double value on the screen. /* suppose all necessary libraries are included here */ /* Declare structure that you may need (4 pt)*/ void *mythread(void *args) { // (6 pt) } void main(int argc, char *argv[]) { // (10 pt) // Suppose the parameters that will be passed to 5 copies of // threads are stored in the local arrays declared below. // CH[0], N[0], D[0] will be passed to thread 0, and so on. char CH[5] = "ABCDE"; int N[5] = {3, 5, 8, 12, 21}; double D[5] = {2.5, 3.6, 4.7, 5.8, 6.9}; pthread_t tid[5]; for(i=0; i< 5; i++) { pthread_create(&tid[i], NULL, mythread, ); } for(i=0; i< 5; i++) pthread_join(tid[i], NULL); } 5

6 5. [20 points] Synchronization : Suppose there are three threads P, Q and R, each has some sequential code sections and then updates a shared variable count, as shown in the below table. Define and initialize semaphores to solve the synchronization and the critical section problems (use acquire/release or wait/signal). Assume that QS1 needs to be executed after PS1 and RS1, and PS2 needs to be executed after QS1 RS2 needs to be executed after QS2 which needs to be executed after PS2 /* Semaphores and initial Values: */ 5pt P Q R PS1(); QS1(); RS1(); 10pt PS2(); QS2(); RS2(); count = count + 3 count = count - 2 y = count + 5 5pt 6

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