Re: [gentoo-user] Howto speed up compilations

[Daniel da Veiga <danieldaveiga@gmail.com>]

That sounded nice, if you can come with a "cluster" for compilation
you may see good results, I've never used distcc but a friend got
three athlon xps running and did it, he was able to install the three
gentoos within a day (wich is more than I could ever expect after my 2
days stage1 install with no x or openoffice).

On 7/18/05, Colin <signofzeta@gmail.com> wrote:
> Neil Bothwick wrote:
> 
> >On Mon, 18 Jul 2005 14:14:41 -0300, Bruno Lustosa wrote:
> >
> >
> >
> >>>A few weeks ago I read in one of the newgroups a way to greatly
> >>>decrease compilation times. The author noted that this was
> >>>particularly noticable when working with something like OO. The
> >>>general jist of it was to create temporary file system in memory and
> >>>mount your portage tmpdir there. For the life of me, I can't find
> >>>that thread anymore. Does anyone do something similar to this? Are
> >>>there noticable gains to be had. I have an Athlon 2800XP and 1 GB ram.
> >>>
> >>>
> >>I am not sure if this will give a tremendous speedup. Granted, the
> >>source files won't need to be read from disk, which is an advantage,
> >>however, the file reading time should be very small compared to the
> >>time it takes for the compiler to translate the source code into
> >>machine code.
> >>Also, there's the ammount of memory you will lose, memory that could
> >>be used by the compiler. In some cases, gcc can eat very big chunks of
> >>memory.
> >>
> >>
> >
> >Not to mention the OOo ebuild needing around 3GB of space in TMPDIR, so
> >this approach would only result in the emerge failing quicker.
> >
> >
> Not if you've got a machine with more than 3 GB of memory.  A dual-proc
> Power Mac G5 can handle up to 8 GB of physical RAM.  If you did this
> trick on one of those, you might see some serious improvement!  But with
> most PC's being limited (by the x86 and motherboard designs) to 2 GB of
> physical RAM, it wouldn't work with large apps.
> 
> A good suggestion would be to grab some old computers, Gentoo-ize them,
> network them over 100BaseTX or Gigabit and make a little distcc farm.
> Plus, you can charge people if they want to come over and rent your
> computing power.  (Virginia Tech does that with their "System X," 1,100
> dual-2.3GHz-processor XServe G5's.)  :-)
> --
> Colin
> --
> gentoo-user@gentoo.org mailing list
> 
> 


-- 
Daniel da Veiga
Computer Operator - RS - Brazil

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