On Sat, Feb 13, 2016 at 5:34 PM, Carlos E. R. <robin.listas@telefonica.net> wrote:
But we are talking now of big machines with dozens of cores or chips. With only a few channels, there will be collisions.
When I was studying, the books said that they did not know yet how to handle this situation.
NUMA - Non-Uniform Memory Access This 4-year old paper from Intel says their high-end Xeon's were already using NUMA back then. At the time the biggest single Intel CPU had 10 cores. There is one about to come out with 22 cores (44 threads with hyper threading) so I'm sure NUMA is even more common in large core count Xeons.. http://www.intel.com/content/dam/www/public/us/en/documents/white-papers/vir... === OVERALL PERFORMANCE CHANGES Over the last three to four years, CPU and server platform performance have increased dramatically. The Intel server platform has gone through a complete evolution, which has brought about significant changes and redesign of CPUs, memory subsystems, I/O subsystem, and graphics. We have increased the CPU core count from two to 10 cores and reintroduced Intel® Hyper-Threading Technology (Intel® HT), which doubles the number of software threads per CPU core to a maximum of 20 in today’s highest-performing CPUs. The CPU execution pipeline has changed, instructions issued per clock cycle have increased, and new features such as Turbo Mode have been introduced. The memory controller has been integrated into the CPU and the memory structure has changed, moving from Uniform Memory Access (UMA) architecture to Non-Uniform Memory Access (NUMA) architecture. Therefore, comparing older-generation CPUs and platform architectures is not an easy task. The difficulty increases with virtualization, where oversubscription of resources is now possible, heavily modifying non-virtualized behavior and increasing the difficulty of making a comparison. === Greg -- Greg Freemyer www.IntelligentAvatar.net -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org