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Technology Stocks : All About Sun Microsystems -- Ignore unavailable to you. Want to Upgrade?

To: JC Jaros who wrote (35242)	9/13/2000 12:05:20 AM
From: rudedog	Read Replies (1) \| Respond to of 64865

JC - I know you were referring to a specific OS that has had bottleneck problems. But the fact is that every OS needs significant tweaking depending on the architecture it is running on. NUMA-like switch architectures present memory access times which may vary by a factor of 3 or more, and have lower cache hit ratios than UMA machines. An OS which assumes a UMA model is often optimized around the processor pipeline - keep processor stalls to a minimum, arrange interrupt forks so that they minimize I&D flush, etc. Those techniques may be exactly wrong for a big machine, which instead needs to be optimized ASSUMING those kind of activities. The process of optimizing for a given architecture is a complex mixture of driver design, context switch management, and page table management.