Programming Project Two
Computer Science 4334 -- Fall 2000
Operating Systems

CSCI4334	Assigned:	Friday September 22, 2000
	Due:	Monday October 9, 2000

You are to complete the ``Laboratory Exercise: Observing OS Behavior'' on page 147 of the textbook. Read the description there for detailed discussion. The information here added some issues that were not clear in the textbook description.

• The Linux (and most other UNIX) provides a pseudo-file system named /proc to store most of the statistics about the system. The assignment asks you to write three versions of a program to collect different statistics using the file /proc.
• The statistics you are to collect are as follows.
  • A first version collects and prints:
    • CPU type and model
    • Kernel version
    • Amount of time since the system was last booted.
  • A second version should print the same information as the first one plus:
    • The amount of time the CPU has spent in user mode, system mode, and idle
    • The number of disk requests made on the system
    • The number of context switches the kernel has performed
    • The time at which the system was last booted
    • The number of processes that have been created since the system was booted
  • The last version of the program should print the same information as the second version plus:
    • The amount of memory configured on this computer
    • The amount of memory currently available
    • A list of load average (each averaged over the last minute). The program would take two parameters: (1) how often the load average should be read from the kernel; (2) how many total times the load average should be read.

• The /proc file system has a number of directories and a number of files. Each file or directory contains some statistics that the system has been collecting. You should use a separate program (major source code listed here) to find out which file contains what information. The files are stored in special format such that you need to use the following program to read and interpret the information. Carefully read man proc to get more information. Read, compile and execute the following program to read the files in /proc file system.
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• You don't have to submit three separate versions of the program. You should make the first version work correctly; then the second version; then the third version. All you need to turn in is the third version. However, if you have trouble finishing all, you may turn in the first or second version for partial credit.