Mailinglist Archive: opensuse (933 mails)

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Re: [opensuse] openSUSE on SSD?
  • From: Adam Tauno Williams <awilliam@xxxxxxxxxxxxx>
  • Date: Wed, 02 Jun 2010 07:44:16 -0400
  • Message-id: <1275479056.16547.7.camel@xxxxxxxxxxxxxxx>
On Wed, 2010-06-02 at 06:46 -0400, Anton Aylward wrote:
Graham Anderson said the following on 06/02/2010 12:09 AM:
On Tuesday 01 June 2010 13:53:30 Adam Tauno Williams wrote:
Really? I've seen demonstrations of that and not been impressed. You
could get, IMNSHO, a bigger performance boost by spending that same
amount of money on a lot more RAM.
This is not really true at all, not for anyone that already has enough RAM
to
avoid excessive swapping. You could have 64GB of RAM and your apps and boot
will not be any faster because your still blocked on the bottleneck of your
mechanical drives.
Yes, it is true.
You've done a switcheroo.
You've focussed solely on booting.
Swapping isn't only the reason to hit the disk.

+1

Starting new applications requires searching the directory trees and
inodes, paging in blocks that weren't already in memory. Ditto opening
files. Having more memory means these too can be 'cached' - or at least
not paged out ONCE THEY ARE READ IN.
As for booting ... how many times a year do you boot your server farm?

Or even your workstation or laptop? Once a day?

And the way UNIX/LINUX manages shared libraries [they are shared! :)]
that once you have the library in memory starting another application
that uses that library is a simple initialization of another writable
region for the libraries stack. The library doesn't get reloaded.

Open OpenOffice. Close OpenOffice. Open it again. If you have
sufficient memory [cached pages didn't get dropped] the second time you
open it is *much* faster.

I realise - and have stated - things are different for laptops
(netbooks, slates, pads, smartphones).
As I keep saying,
Context Is Everything.
Don't presume your context is the only one.

--
Adam Tauno Williams <awilliam@xxxxxxxxxxxxx> LPIC-1, Novell CLA
<http://www.whitemiceconsulting.com>
OpenGroupware, Cyrus IMAPd, Postfix, OpenLDAP, Samba

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