On Fri, 2004-05-21 at 18:32, Kaj Haulrich wrote: > > By way of confirmation, please witness these latest benchmarks in > > Linux Gazette which bear out what you are saying: > > > > http://linuxgazette.net/102/piszcz.html > > > > > > LX > > Interesting. And I think the defragging can be set up as a cron job. > My experience with JFS stems from my OS/2 days, and I don't > remember I ever had to defrag it. In OS/2 there was a nifty > feature, a graphical representation of the filesystem. One could > actually see how it worked, distributing files in a very clever > manner. Fragmentation never amounted to more then 2 %. > > Next time I do a clean install, I'll try it on linux, although I > have no complaints whatsoever with my ReiserFS. > > Kaj Haulrich.
<grin> You might if you look at the benchmarks. Reiser consumes a horde of cpu cycles in order to deliver performance that is not really superior either to xfs or jfs *overall*. I tip the hat to Reiser design, it's quite sophisticated, however if the design is not living up to it's promise, then I'm unsure of it's true value. Look at image034.jpg (Split 10mb File) of the linux gazette article page. Reiser's advanced design should be letting it kick ass here...yet, it is just barely comparable to JFS's curve, which is phenonmenal. In image029.jpg (Megabytes Per Second On Copy From Current To Other Disk), Reiser has the poorest showing in the group, with JFS beating it out. Which brings me to the topic of image021.jpg -- "Total CPU Utilization For Each Filesystem". This test was an aggregate accumulation of all cpu usage across all tests. JFS shows an unbelievable kick ass advantage over the other journaling filesystems, and then in addition shows an advantage over ext2, which isn't even a journaling filesystem, for pete's sake!!! That's an absolute first; it's never been done before. I do not know why it has not gotten more press. Logic would lead you to believe that such a feat as that would not be possible. Journaling filesystems have to do more stuff than nonjournaling filesystems. But yet, there it is; a journaling filesystem is outperforming a non journaling filesystem in CPU utilization benchmarks. Reiser, on the other hand, has the absolute worst showing of any of the other filesystems here in image021.jpg. Of the entire group, Reiser is the biggest CPU hog; while at the same time delivering no overall speed advantages to it's CPU usage. The *aggregate* tests reveal this. Given the other aggregate benchmarks (like image020.jpg, Total Time For Each Filesystem), the final qualifier, for me anyway, becomes the advantage of total system speed. JFS has the undisputed advantage here; it leaves the CPU available for things other than testing sophisticated filesystem theory. ;) LX
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