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The Windows operating system uses a Symmetric multiprocessing (SMP) architecture to allow multiple processes to run concurrently. This multitasking is done at the thread
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level, so if an application is multithreaded, as is the case with SQL Server 2005, it can perform tasks concurrently. A recent trend in hardware is scaling out the processors by supporting multiple cores per processor because it is more cost effective to shrink and use multiple cores on a processor than to increase the speed of processors. Modern operating systems and business applications, such as SQL Server 2005, are multithreaded and, consequently, can take advantage of this technology. The best multitasking performance is achieved through multiprocessor servers versus equivalent multicore uniprocessor servers. With the advent of multicore processors, discussions can get a bit confusing, so it is common to refer to the sockets on the motherboard, as opposed to the processors. The number of sockets that a server supports depends on the hardware vendor, but eight-way socket servers are now commonplace. Using more than eight sockets tends to substantially increase the hardware cost due to the complexity of designing appropriate motherboard technology. An interesting trend, as shown in Figure 32-1, is how dual-socket servers catch up with four-socket within 12 to 24 months based on Intel Xeon processor-based servers over the past decade. So when purchasing your hardware remember to plan for future growth. This might involve purchasing additional processors or upgrading to faster processors. So talk to your hardware vendor.
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Dual-socket servers catch up with four-socket servers within 12 to 24 months Transactions per minute (tpmC) 1000 128-socket 16-socket 8-socket 4-socket 2-socket 1-socket
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Figure 32-1 How dual socket servers catch up with four-socket servers within
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12 to 24 months.
32
Microsoft SQL Server 2005 Scalability Options
More Info For more information on right-sizing your server and cutting system costs through dual-socket server, you should read the Server Rightsizing:
Dual-socket Systems Cut Costs article located at http://www.intel.com/it/pdf/ server-rightsizing.pdf.
Multicore Processors
Multicore processor solutions available from AMD and Intel represent a great way of scaling your processor susbsystem. Processors with multiple cores can execute multiple jobs simultaneously (multitask) compared to single-core processors, although an application has to be multithreaded to take advantage of the architecture. SQL Server 2005 can take advantage of multiple cores because it allocates a scheduler to each core as if it were a separate processor. SQL Server 2005 licensing is based on the processor (or socket) and not how many cores the processor has, so multicore processors represent a lower total cost of ownership (TCO). Multicore processors scale very effectively, although AMD and Intel have taken different approaches with the design of their Opteron/Athlon and Xeon/Pentium processors, respectively. When deciding on a multicore processor server, don t forget to look at the the multicore architecture, the Front Side Bus (FSB) speed, the memory controller, related I/O chipsets and power usage/efficiency. In other words, it is a holistic look at the entire server, as opposed to concentrating on any particular hardware component. At the time of writing this book, Intel just released quad-core processors in the last quarter of 2006, and AMD is planning to release their re-engineered quad-core processors in mid 2007. I would not be surprised to see eight-core processors being released as early as 2008 as both AMD and Intel shift to 65nm fabrication for their processor lines.
Hyperthreading
Intel s hyperthreading technology has the potential to yield good performance gains on a number of applications by effectively allowing the CPU to remain less idle. However, hyperthreading does not guarantee the same performance as a server with two processors or a multicore processor. Microsoft s conservative testing has shown 10 to 20 percent improvements in certain SQL Server workloads, but the application patterns have a significant impact on these metrics. You might find that your SQL Server 2005 solution does not receive an increase in performance by taking advantage of hyperthreading. If the physical processor is already saturated with multiple concurrent scheduler tasks, using these logical processors can actually reduce the workload because you end up thrashing the CPU cache.
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