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The Windows Scheduler

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Peter Shirley-Quirk
Peter Shirley-Quirk

An introduction to the Windows Scheduling algorithms with a discussion of its relevance to software developers.

Technologie
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The Windows Scheduler Peter Shirley-Quirk
The Windows Scheduler ,[object Object],[object Object],[object Object],[object Object]
What is a scheduler? ,[object Object],[object Object],[object Object],[object Object],[object Object]
How does Windows Scheduler work? ,[object Object],[object Object],[object Object],[object Object]
When is a thread Ready to run? Figure 3-19, Inside Microsoft Windows 2000, Third Edition by David A. Solomon and Mark E. Russinovich
Context switching (1) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Context switching (2) ,[object Object],[object Object],[object Object],[object Object],[object Object]
Process Priority Classes The Process Priority Class is under the designer’s control Can be read or set using System.Diagnostics.Process.PriorityClass AboveNormal Time-critical tasks that must be executed immediately e.g. the Task List dialog High BelowNormal E.g. multimedia applications RealTime E.g. screen saver, indexer etc. Idle No special scheduling needs. Normal
Where does the priority come from? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
When does the scheduler boost the priority? ,[object Object],[object Object],[object Object],[object Object],[object Object]
Resolving priority inversion ,[object Object],[object Object],[object Object],[object Object],A B C Wait Ready Time Priority A
What if there’s more than one processor? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Multi-Processor Architecture ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Some final thoughts ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
More information ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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The Windows Scheduler

  • 1. The Windows Scheduler Peter Shirley-Quirk
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  • 5. When is a thread Ready to run? Figure 3-19, Inside Microsoft Windows 2000, Third Edition by David A. Solomon and Mark E. Russinovich
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  • 8. Process Priority Classes The Process Priority Class is under the designer’s control Can be read or set using System.Diagnostics.Process.PriorityClass AboveNormal Time-critical tasks that must be executed immediately e.g. the Task List dialog High BelowNormal E.g. multimedia applications RealTime E.g. screen saver, indexer etc. Idle No special scheduling needs. Normal
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