lkml.org 
[lkml]   [2007]   [Jul]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: updatedb
    On 7/26/07, Rene Herman <rene.herman@gmail.com> wrote:
    > On 07/25/2007 07:15 PM, Robert Deaton wrote:
    >
    > > On 7/25/07, Rene Herman <rene.herman@gmail.com> wrote:
    >
    > >> And there we go again -- off into blabber-land. Why does swap-prefetch
    > >> help updatedb? Or doesn't it? And if it doesn't, why should anyone
    > >> trust anything else someone who said it does says?
    >
    > > I don't think anyone has ever argued that swap-prefetch directly helps
    > > the performance of updatedb in any way
    >
    > People have argued (claimed, rather) that swap-prefetch helps their system
    > after updatedb has run -- you are doing so now.
    >
    > > however, I do recall people mentioning that updatedb, being a ram
    > > intensive task, will often cause things to be swapped out while it runs
    > > on say a nightly cronjob.
    >
    > Problem spot no. 1.
    >
    > RAM intensive? If I run updatedb here, it never grows itself beyond 2M. Yes,
    > two. I'm certainly willing to accept that me and my systems are possibly not
    > the reference but assuming I'm _very_ special hasn't done much for me either
    > in the past.

    Might be insignificant, but updatedb calls find (~2M) and sort (~26M).
    Definitely not RAM intensive though (RAM is 1GB).

    >
    > The thing updatedb does do, or at least has the potential to do, is fill
    > memory with cached inodes/dentries but Linux does not swap to make room for
    > caches. So why will updatedb "often cause things to be swapped out"?
    >

    [ snip ]
    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2007-07-26 08:25    [W:0.022 / U:125.108 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site