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16. Server Hardware > Lots of Memory

Lots of Memory

Servers should have large amounts of RAM to reduce disk accesses. A good rule is to allow enough RAM to hold the complete OS and the most frequently accessed parts of your data set. Servers also tend to have large L1 and L2 caches, and may have the cache split between data and instruction caches, because data and instructions have different access patterns. The only memory faster than L1 cache is the set of registers on the CPU. Many megabytes of L2 cache is becoming common, but the physical distance of the cache from the CPU, even just an inch, significantly reduces the effectiveness of the cache. Unfortunately, the effectiveness of caching for server CPUs is reduced by the context switching that happens with every network interrupt. HTTP....


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