On Fri, 18 Jul 2008, Tim wrote: > Except the article was redacted. The reason the battery life > decreased was because the throughput increased so much that it drove > up the cpu usage up, thus bringing down battery life. It just goes to > show how SEVERELY io bound we currently are. The flash itself was > using LESS power.
Any study will show that (similar to humans) computers make little use of their brains. The CPU spends a large part of its time idle waiting for data be copied from RAM to second level cache, and then to first level cache. The RAM sits idle waiting for data to be copied from disk or network. That is why Sun's SPARC T1/T2 CMT technology does not suck in servers. Unfortunately, except for the database random access cases and synchronous write cases, the solid state memory will still not make much difference since it is so much remarkably slower than system RAM. If RAM is good for 10GB/second (or 20GB/second for fastest system), the FLASH device might be good for 100MB/second. Fortunately for us, most computers in the world spend 99.99% of their time waiting for the human to do something. Bob ====================================== Bob Friesenhahn [EMAIL PROTECTED], http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/ _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
