On 7/26/07, Rene Herman <[email protected]> wrote:
On 07/25/2007 07:15 PM, Robert Deaton wrote:
> On 7/25/07, Rene Herman <[email protected]> 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 ]
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