[gentoo-amd64] Re: tmpfs help

[Duncan <1i5t5.duncan@cox.net>]

Volker Armin Hemmann <volker.armin.hemmann@tu-clausthal.de> posted
200802131346.26316.volker.armin.hemmann@tu-clausthal.de, excerpted below,
on  Wed, 13 Feb 2008 13:46:26 +0100:

> On Mittwoch, 13. Februar 2008, Duncan wrote:
>>>removed lots of irrelevant 'my hardware is so cool' stuff'.
> 
> You forget some (little) things. Not everything can be swapped out. Swap
> is extremly slow AND it is much worse to swapout/swapin programm code
> that should be run, instead of fetching some files from disk while the
> programm runs.

It's not always much worse, because as I explained, in my case, swap is 4-
way striped while most of the main system is only two-way striped.  Thus, 
that "irrelevant" stuff is relevant after all, because it alters the 
conditions of the case in debate, because swap reads in at ~2x the speed 
of most data read off disk including apps (which is itself ~2x what a 
single-disk system might reasonably expect).

I've a feeling not appreciating this, not appreciating that your "test" 
case example of compiling with 2 gigs RAM vs only 1 has little to do with 
what might occur with PORTAGE_TMPDIR on tmpfs vs on disk, and not 
appreciating the point RF and I are both trying to make, is due to the 
same logic flaw.

-- 
Duncan - List replies preferred.   No HTML msgs.
"Every nonfree program has a lord, a master --
and if you use the program, he is your master."  Richard Stallman

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