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  • Performance impact: the cost of NUMA remote memory access

    These days if you get a new server-class machine to run SQL Server, you can almost be 100% sure that it’ll be running on NUMA hardware. The recent AMD Opteron and Intel Nehalem-based processors are all built on some form of NUMA architecture. The current consensus is that as the number of processors grows, their shared memory bus can easily get ...
    Posted to Linchi Shea (Weblog) by Linchi Shea on January 30, 2012
  • Performance impact: memory effectiveness of virtualization

    One of the key performance metrics on any computer system is its memory speed (or memory bandwidth).   Memory speed can be measured in many different ways at different levels. At the OS level, one way to measure memory speed is to clock how fast (in terms of megabytes/gigabytes per second) it can read a piece of data from a memory location ...
    Posted to Linchi Shea (Weblog) by Linchi Shea on July 29, 2009
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