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Politics : Formerly About Advanced Micro Devices
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To: Process Boy who wrote (86095)1/9/2000 3:52:00 PM
From: Scumbria  Read Replies (4) of 1573941
 
PB,

I wish Scumbria to quantify his position on this.

I've seen data for Winstone which shows that performance improvements diminish rapidly after 256KB of cache. Going from 32KB to 256KB cache improves Winstone scores by about 50%. Going from 256KB to 512KB of cache only produces 5-10% improvement.

The problem is that caches are only valuable for instructions/data that are used more than once, and not for the first time they are used. A certain percentage of the data does not come in that category, and even an infinite sized cache will not improve hit rates beyond a certain value.

Nevertheless, larger caches are inevitable. Improving compiler technology and instruction sets will make better use of caches in the future.

Scumbria
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