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Wednesday, September 18 • 11:50am - 12:40pm
Bare Metal Performance, Timekeeping, and Energy Efficiency - Paul McKenney, IBM

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Database, high-performance computing (HPC), and real-time developers have often asked: "Can't you get the kernel out of the way?". Recent adaptive-idle work permits just that: Linux is there when you need it, but if you follow a few simple rules, it is out of your way otherwise. This approach will provide bare-metal multicore performance and scalability to databases as well as to HPC and real-time applications. However, timekeeping requires that at least one CPU continue in high-power mode if any non-idle execution is in flight. Unfortunately, simple code to determine if all CPUs are idle is not scalable. This talk will give an overview of adaptive idle and outline some of the work to scalably determine whether the timekeeping CPU can go into low-power mode while avoiding any embarrassing time-skew incidents.

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Paul McKenney

Distinguished Engineer, IBM Linux Technology Center, Beaverton
Paul E. McKenney is a Distinguished Engineer with the IBM Linux Technology Center, where he maintains the RCU implementation within the Linux kernel. He has been coding for four decades, more than half of that on parallel hardware. His prior lives include the DYNIX/ptx kernel at Sequent... Read More →

Wednesday September 18, 2013 11:50am - 12:40pm
Celestin B

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