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CS170 Discussion – 2009-04-24

Learn about the benefits of pair programming and the concept of realtime process scheduling in CS170. Get insights into the roles of driver and observer, increased efficiency and fewer bugs, and the steps involved in realtime process scheduling.

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CS170 Discussion – 2009-04-24

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  1. CS170 Discussion – 2009-04-24 Bryce Boe

  2. Outline • Announcements • Pair Programming • Project 3 Questions • Partner Assignment

  3. Announcements • Project 3 Deadline extended to Friday March 1 11:59 • Late Point Deduction: 1% every 5 minutes • New rules for making patches • http://cs.ucsb.edu/~bboe/dynamic/170_teams#patches

  4. Pair Programming • 2 people, 1 computer • Two Roles • Driver – in control of keyboard and thus for the code that get emitted • Observer – watches driver, plans the next steps

  5. Why am I talking about this? • Both members understand all changes, thus get more out of this course • Mutual benefit of shared knowledge and experience

  6. Hand-wavy statistics • ~15% less efficient than two independent developers • ~15% fewer bugs produced* • Increased enjoyment from of programming • http://collaboration.csc.ncsu.edu/laurie/Papers/XPSardinia.PDF

  7. “"It's like twice the brains with half the typing!” - Jeff Browne 1st year Ph.D.

  8. Source: Jonathan Kupferman 1st year MS

  9. Pair Programming Video http://agile.csc.ncsu.edu/pairlearning/educators.php Courtesy of North Carolina State University

  10. Project 3 – Realtime processes • A realtime process is one that does not get • Invoked via the syscall: enter_rt(clock_t period)

  11. Notes • Steps in getting message to scheduler • User process makes system call • System call is a wrapper around passing message to the appropriate server • The appropriate server then sends a message to the kernel (kernel call) • The scheduler now has it. • Round-robin scheduling of different priorities

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