Sources Contact Advanced Search Tutorials

An Interest In:

Web News this Week

Search Archive

Some of Our Sources

View All Sources

Help Webnuz

Referal links:

November 22, 2020 08:34 pm

Memory vs. Disk vs. CPU: How 35 Years Has Changed the Trade-Offs

Long-time Slashdot reader 00_NOP is a software engineer (with a PhD in real-time computing) re-visits a historic research paper on the financial trade-offs between disk space (then costing about $20,000 per kilobyte) and (volatile) memory (costing about $5 per kilobyte):Thirty-five years ago that report for Tandem computers concluded that the cost balance between memory, disk and CPU on big iron favoured holding items in memory if they were needed every five minutes and using five bytes to save one instruction. Update the analysis for today and what do you see? Well my estimate is that we should aim to hold items that we have to access 10 times a second. And needless to say, some techniques for saving data space are more efficient than they were 35 years ago, their article points out. "The cost of an instruction per second and the cost of a byte of memory are approximately equivalent — that's tipped the balance somewhat towards data compression (eg., perhaps through using bit flags in a byte instead of a number of booleans for instance), though not by a huge amount."

Slashdot

Slashdot was originally created in September of 1997 by Rob "CmdrTaco" Malda. Today it is owned by Geeknet, Inc..

More About this Source Visit Slashdot