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  <title>Scheduling</title>
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  <title>Scheduling</title>
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  <para>One of the key aims of the operating system is to create and support
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  <para>One of the key aims of the operating system is to create and support
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  the impression that several activities are executing contemporarily. This is
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  the impression that several activities are executing contemporarily. This is
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  true for both uniprocessor as well as multiprocessor systems. In the case of
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  true for both uniprocessor as well as multiprocessor systems. In the case of
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  multiprocessor systems, the activities are trully happening in parallel. The
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  multiprocessor systems, the activities are truly happening in parallel. The
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  scheduler helps to materialize this impression by planning threads on as
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  scheduler helps to materialize this impression by planning threads on as
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  many processors as possible and, when this strategy reaches its limits, by
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  many processors as possible and, when this strategy reaches its limits, by
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  quickly switching among threads executing on a single processor.</para>
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  quickly switching among threads executing on a single processor.</para>
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  <section>
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  <section>