MECH 2301 Lecture 4: MECH 2301 Lecture 4 Notes
20 May 2018
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MECH 2301 Lecture 4 Notes
Introduction
Emphasis on the Symbiosis
• Introduced several CPU dispatching algorithms, comparing the way in which these met
different objectives.
• The focus of memory management is to load programs in such a way as to enhance
system performance.
• We briefly discussed the shortcomings of partitioning methods as a way to introduce
virtual storage.
• The emphasis on the symbiosis between the hardware and the operating system to
provide a memory management technique that addresses many of the shortcomings of
other memory management techniques.
• The virtual storage methodology eliminates the requirement that the sum of programs
to be loaded as a whole must fit all at once into available memory
• Instead, the active parts of each program are sufficient.
• It allows each program to exist in the same virtual memory space.
• It allows programs to be loaded anywhere in memory, and non-contiguously.
• And it eliminates the need for relocation procedures.
• We explained the page fault procedure and discussed several page replacement
algorithms.
• We considered the number of pages that are required to execute a program successfully
and efficiently, and we considered the problem of thrashing.
• Next, we discussed the algorithms used for secondary storage.
• Following that, we presented the operating system components that support
networking.
• We next introduced briefly the issues of deadlock, process synchronization, and inter
process communication.
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