When
· Naughties
· · 2004
· · · August
· · · · 23 (1 entry)

Moore Who? · Cyberspace is buzzin’ tonight over the <a href='http://namesys.com/'>release of the Reiser4 filesystem</a>, which seems to be pretty hot stuff. I was looking at their <a href='http://namesys.com/benchmarks.html'>benchmarks page</a> and was charmed to see an appearance by <a href='http://www.coker.com.au/bonnie++/'>Bonnie++</a>, a direct descendent of the original Bonnie <a href='/ongoing/When/200x/2004/08/20/Bonnie2004'>mentioned here</a> just the other day. The benchmarks suggest that on a good computer with a modern filesystem, you can expect to get 130 or so random seeks/second in 1G of data, 105 in 3G. That’s not bad... in fact it’s <em>three or four times faster</em> than the best results <a href='http://groups.google.com/groups?selm=1990Jul30.022146.2603%40watdragon.waterloo.edu&output=gplain'>I was able to get in 1990</a> (search for “asymptotically”). Check out the computers I ran that on, they’re museum pieces. Per Moore’s law, in fourteen years the CPUs ought to have sped up by a factor of 2<sup>14/1.5</sup>=645 or so. Yep, one of them was a 4MHz 386, 4MHz×645=2.58GHz, damn that Moore is smart. I happen to remember that of the original computers I benchmarked, the biggest had 64M of memory. If you applied the same multiplier (645) to the memory, you’d get 4.1G, quite a reasonable figure for a big modern Unix box. I think the lesson is obvious: for high-performance applications, keep your data away from those filthy disks, no matter what filesystem, use memory.
 
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