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Operating Systems

by: Kavon Reynolds

Operating Systems CS 426

Kavon Reynolds
GPA 3.72

Randy Appleton

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About this Document

Randy Appleton
Class Notes
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This 2 page Class Notes was uploaded by Kavon Reynolds on Thursday October 15, 2015. The Class Notes belongs to CS 426 at Northern Michigan University taught by Randy Appleton in Fall. Since its upload, it has received 31 views. For similar materials see /class/224057/cs-426-northern-michigan-university in ComputerScienence at Northern Michigan University.


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Date Created: 10/15/15
CS 426 Creatures of the Night 1 My nal project is a I ve never heard of this evil thing b turned in c I accept my fate send the hungry werewolf 2 What is the fundamental difference between a normal library call cout ltlt quotVampquot and a system call openquotVampquot OiRDONLY 3 I have a zombie making machine This machine must attach a sword to the zombie s arm within 3 seconds of attaching the arm or the zombie will not function properly This machine must also monitor the zombie fuel tank level every 5 seconds or the factory will explode Finally the machine must blink a small red light every 05 seconds to amuse the mad scientist Things have been designed so that the computer has enough resources and capability to meet all requirements Which of these tasks should have the highest priority 4 The swordhand connecting machine will often need attention from the computer It has a special memory location that is a 391 if the machine needs attention from the CPU and a 390 otherwise The CPU is required to periodically look at this memory location and check the value What is the standard name of this technique 5 The lightening bolt generator also requires CPU attention It uses a better technique than the one described above What is that technique Either give a name or a description 6 YesNo Igor writes a program with an in nite loop The computer slows down but other users remain functional Does the CPU scheduler use First Come First Serve 7 SingleTwo Vlad Tepes has a program that uses all the virtual addresses from 1G to llG Which would have less ram used for page tables a single layer page table or a two layer page table 8 Where are page tables stored In the MMU In the CPU In main ram Elsewhere 9 Is the time required to switch from using one page table to another dependent on page table size Mostly no Mostly yes 10 The main monstermaking computer has two zombie assembly processes 100K code 200K data one werewolf database 200K code 1000K data and three blinkylight programs 10K code 10K data It uses paging and 1K pages How much RAM does the machine need to avoid swapping or paging 11 The mainframe described above is sooooo weird it uses 100K pages How much RAM does it need under this condition 12 The mainframe has 5 disks Each disk holds 1 gigabyte Total file space needed is only 2 gigabytes Which scheme could be used RAID 0 RAID 1 RAID 5 RAID the cemetery for a body part 13 Which scheme would survive the most quotaccidental acid spillsquot when Igor has one of his quotfitsquot RAID 0 RAID 1 RAID 5 14 What song is played in the laboratory most often Hint It39s not Monster Mash or Werewolf of London 15 During an unfortunate snotacid experiment Gremlins got into the system and the mainframe lost three inodes from the file system How many files were lost Zero One Three The file system 16 One a different computer two FATs were lost How many files were lost Zero One Three The file system 17 Which is quicker to seek to the end of a small EXT2 file or the end of a large EXT2 file smaller file is faster larger file is faster it39s equal 18 Suppose that I have a FAT based file system where the FAT pointers are only 10 bits long Bats y Which ofthese is true The largest possible file is about 1024 clusters The largest possible file system is about 1024 clusters


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