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Modern Operating Systems by Herbert Bos and Andrew...
Modern_Operating_Systems_by_Herbert_Bos_and_Andrew_S._Tanenbaum_4th_Ed.pdf-M ODERN O PERATING S YSTEMS
Modern Operating Systems by Herbert...
Modern_Operating_Systems_by_Herbert_Bos_and_Andrew_S._Tanenbaum_4th_Ed.pdf-M ODERN O PERATING S YSTEMS
Page 1058
SEC. 12.7
Designing an operating system starts with determining what it should do. The
interface should be simple, complete, and efficient. It should have a clear user-in-
terface paradigm, execution paradigm, and data paradigm.
The system should be well structured, using one of several known techniques,
such as layering or client-server. The internal components should be orthogonal to
one another and clearly separate policy from mechanism. Considerable thought
should be given to issues such as static vs.
dynamic data structure, naming, bind-
ing time, and order of implementing modules.
Performance is important, but optimizations should be chosen carefully so as
not to ruin the system’s structure. Space-time trade-offs, caching, hints, exploiting
locality, and optimizing the common case are often worth doing.
Writing a system with a couple of people is different than producing a big sys-
tem with 300 people.
In the latter case, team structure and project management
play a crucial role in the success or failure of the project.
Finally, operating systems are changing to adapt to new trends and meet new
challenges. These include hypervisor-based systems, multicore systems, 64-bit ad-
dress spaces, handheld wireless computers, and embedded systems.
There is no
doubt that the coming years will be exciting times for operating system designers.
Moore’s Law describes a phenomenon of exponential growth similar to the population
growth of an animal species introduced into a new environment with abundant food
and no natural enemies. In nature, an exponential growth curve is likely eventually to
become a sigmoid curve with an asymptotic limit when food supplies become limiting
or predators learn to take advantage of new prey. Discuss some factors that may even-
tually limit the rate of improvement of computer hardware.
In Fig. 12-1, two paradigms are shown, algorithmic and event driven. For each of the
following kinds of programs, which of the following paradigms is likely to be easiest
to use?
(a) A compiler.
(b) A photo-editing program.
(c) A payroll program.
Hierarchical file names always start at the top of the tree. Consider, for example, the
file name
rather than
contrast, DNS names start at the bottom of the tree and work up.
Is there some funda-
mental reason for this difference?

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