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Concurrency Conclusion

Discover the importance of threads in operating systems since 1985, their role in major applications like word processing and web servers, and the cautionary tale of Microsoft OS/2's excessive thread usage. See why threads are valuable but not free.

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Concurrency Conclusion

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  1. Concurrency Conclusion Andy Wang Operating Systems COP 4610 / CGS 5765

  2. Threads and Synchronization • Better, cleaner, and simpler abstraction to application programmers

  3. Since 1985 • Every major OS comes with threads • Mach • OS/2 • Windows XP, NT, 7, 8, 10 • Vista • Solaris • Mac OS X • iOS • Android

  4. Since 1985 • Major applications are written in threads • Word processing • Databases • Web servers • Embedded systems

  5. A Cautionary Tale • Microsoft OS/2 • Spectacular failure • IBM re-wrote the whole OS from scratch • Used threads for everything • Window systems • Communication among programs

  6. Microsoft OS/2 • Created many threads • Few are ready to run • Most threads wait around for user typing and network packets • Since each thread needs to store its own execution stack (running or waiting), OS/2 required $200 extra memory to store those threads • $200 for working while printing?

  7. The Moral of the Story… • Threads are cheap • But they are not free

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