Re: [gentoo-user] Howzat!

[Joost Roeleveld <joost@antarean.org>]

On Wednesday 20 April 2011 11:25:27 Joost Roeleveld wrote:
> On Wednesday 20 April 2011 03:42:13 Dale wrote:
> > Joost Roeleveld wrote:
> > > On Tuesday 19 April 2011 17:54:02 Dale wrote:
> > >> Kfir Lavi wrote:
> > >>> I do a lot of compiling on my laptop using Catalyst for
> > >>> embedded.
> > >>> I upgraded my RAM to 8GB (2x4GB = 90$ ebay).
> > >>> I mount /var/tmp as tmpfs.
> > >>> Thats how I keep my SSD ;)
> > >>> 
> > >>> Kfir
> > >>> 
> > >>>      --
> > >>>      Poison [BLX]
> > >>>      Joshua M. Murphy
> > >> 
> > >> I got 16Gbs in my rig and I mounted portages work directory on
> > >> tmpfs,
> > >> it
> > >> was actually slower.  That is likely a good idea to keep from
> > >> wearing
> > >> out the SSD but it doesn't seem to make anything compile faster.
> > > 
> > > Strange, it actually got faster on mine when doing that.
> > > Did you mount with "noatime"? :)
> > > 
> > > --
> > > Joost
> > 
> > Yep.  It actually took a few seconds longer compiling in memory.  I
> > thought that was weird to tho.  It doesn't make much sense to me.
> > 
> > Dale
> > 
> > :-)  :-)
> 
> Hmm...
> Will be doing some timing-tests then....
> Openoffice is a good one for that ;)

Ok, just done the tests. using tmpfs for /var/tmp/portage is quicker, but not 
by much.

Without TMPFS:
# time emerge -v openoffice
real 32m44.742s
user 20m18.320s
sys 5m38.000s

With TMPFS:
# mount -onoatime,size=7G -ttmpfs none /var/tmp/portage
# time emerge -v openoffice
real 31m30.835s
user 20m3.510s
sys 5m38.030s

Specification of this machine:
12GB RAM
Quad Core Xeon W3565 @ 3.2Ghz with HT enabled

There are 2 drives in stripe-mode (software RAID-0) which does speed up the 
I/O a lot.

--
Joost