On Thu, 28 Feb 2008 21:53:36 +1100 "Dmitri Nikulin" <[EMAIL PROTECTED]> wrote:
> On Thu, Feb 28, 2008 at 4:09 PM, Justin C. Sherrill > <[EMAIL PROTECTED]> wrote: > > On Wed, February 27, 2008 11:29 pm, Dmitri Nikulin wrote: > > > > > The benchmark at http://people.freebsd.org/~kris/scaling/os-mysql.png > > > (for the full presentation, see > > > http://www.freedomtc.com/pdf/7.0_Preview.pdf, that plot is on slide > > > 17) indicates that FreeBSD 7 not only competes strongly with current > > > Linux performance and scalability, but that DragonFly has been beaten > > > even by NetBSD which came late to the SMP party. > > > > Minor quibble: you're pointing at benchmarks on an 8-core xeon. > > Relatively uncommon hardware, though I'm sure that'll change within a > > year or so. > > Sure, but SMP scalability is one of the key goals of DragonFly, and > for it to be beaten by NetBSD (for which this is not a major goal, and > for which SMP scalability only started being worked on a year ago) is > very confusing. I haven't seen it compared with 1.12, but since no > huge scalability work has gone in for a long time, I doubt it would > close the gap much. AIUI not using the approach to SMP that FreeBSD used was a major factor in starting DragonFly on the basis that it hurts single proceesor performance and is inelegant. I'm sure the DragonFly team would welcome a developer determined to push the BGL steadily further inwards until it vanishes. We would then all find out if the DragonFly approach to SMP really is the best. Until that work is done there is no real way of telling. > So while DragonFly has a lot going for it > (which I never denied), it's challenging to find a situation for which > DragonFly is actually a better choice than FreeBSD. I really like the continuous rewindable backups I get from the journal system in DragonFly, AFAIK that's still unique to DragonFly. I look forward to better ones with Hammer. All my boxes are uniprocessor so SMP performance really doesn't matter at all to me, but losing data does :) -- C:>WIN | Directable Mirror Arrays The computer obeys and wins. | A better way to focus the sun You lose and Bill collects. | licences available see | http://www.sohara.org/
