[Nix-dev] i686 Builds?

Tue May 12 12:49:22 CEST 2015

Yes. Maybe it got renamed... It used to be named 'amd32'.

On Tue, May 12, 2015 at 12:45:36PM +0200, Tomasz Kontusz wrote:
> By amd32 do you mean amd64 with 32 bit pointers?
> 
> "Lluís Batlle i Rossell" <viric at viric.name> napisał:
> >amd32 should be ready in the kernel and gcc/glibc. We just need someone
> >to
> >prepare nix/nixpgks/nixos for this. :)
> >
> >On Tue, May 12, 2015 at 12:05:29PM +0200, Christian Theune wrote:
> >> Hi,
> >> 
> >> same here.
> >> 
> >> Many interpreted languages (like Python) are affected by this as they
> >tend to be quite pointer-happy. As pointer-size doubles from 32bit to
> >64bit we find that in most applications we have about 70% increase when
> >moving to 64-bit ending up with 1.7 as much memory as before. So we
> >also currently run applications in 32-bit virtual machines and rather
> >use many 3GiB processes than a few bigger ones. Moving from 3GiB to
> >64bit requires about 5GiB just to even out the pointer-size effects.
> >> 
> >> Supposedly the amd64 instruction set has some benefits that make e.g.
> >Python run faster on certain computational stuff, but I don’t have
> >prove for that.
> >> 
> >> In the long term we will include 64-bit in the mix anyway as some
> >applications (Mongo, sigh) are quite trigger happy with allocating
> >virtual (non residential) memory for mmapping insane numbers of
> >insanely large files …
> >> 
> >> Christian
> >> 
> >> > On 12 May 2015, at 11:59, Lluís Batlle i Rossell <viric at viric.name>
> >wrote:
> >> > 
> >> > My experience is equal with Marco, about memory and my usage of
> >i686. i686
> >> > is important for me too.
> >> > 
> >> > On Tue, May 12, 2015 at 11:43:47AM +0200, Marco Maggesi wrote:
> >> >> I use 32 bit a lot.
> >> >> First of all, I use it on some old machines with 32bit hardware.
> >> >> But, more importantly, I use it regularly on virtuabox and xen
> >virtual
> >> >> machines.
> >> >> In my experience, for most of my use cases the 32bit require less
> >memory
> >> >> (which is often not abundant on virtual instances) and it is thus
> >generally
> >> >> faster for many computing tasks .  I made some tests with HOL
> >Light (the
> >> >> theorem prover).  The bare program has memory occupation which
> >almost the
> >> >> double in the 64bit version (~1.2Gb) with respect to the 32bit
> >version
> >> >> (~0.7Gb).  On a virtual machine with 2Gb of ram, the 32 bit it is
> >often
> >> >> 10%-20% faster on typical usage and 50% faster or more when the
> >computation
> >> >> requires more memory.
> >> >> In my experience, the version 32 bit can be more convenient than
> >the 64bit
> >> >> version in a variety of situations.
> >> >> So, please, do not give-up with 32 bit support.
> >> >> Marco
> >> >> 
> >> >> 
> >> >> 
> >> >> 2015-05-12 11:08 GMT+02:00 Luke Clifton <ltclifton at gmail.com>:
> >> >> 
> >> >>> +1
> >> >>> 
> >> >>> This seems like a good idea.
> >> >>> 
> >> >>> On 12 May 2015 at 06:45, William Kennington
> ><william at wkennington.com>
> >> >>> wrote:
> >> >>> 
> >> >>>> Maybe it would make more sense to only build the i686 builds if
> >our
> >> >>>> tested set of x86_64 binaries build correctly. We would still
> >release with
> >> >>>> both but it would cut down on a lot of redundant failures.
> >> >>>> 
> >> >>>> On Mon, May 11, 2015 at 3:39 PM Ryan Trinkle
> ><ryan.trinkle at gmail.com>
> >> >>>> wrote:
> >> >>>> 
> >> >>>>> I encountered an i686 user just the other day!  I don't use it
> >> >>>>> personally, but having solid support in Nix was fantastic,
> >especially
> >> >>>>> because older, 32-bit machines tend to be slower, which makes
> >Nix's binary
> >> >>>>> caching functionality even more important.
> >> >>>>> 
> >> >>>>> On Mon, May 11, 2015 at 6:36 PM, Shea Levy <shea at shealevy.com>
> >wrote:
> >> >>>>> 
> >> >>>>>> Hi all,
> >> >>>>>> 
> >> >>>>>> Do we still have users running 32-bit machines? It would
> >reduce the
> >> >>>>>> load on
> >> >>>>>> hydra significantly if we could drop support for i686, though
> >of course
> >> >>>>>> if
> >> >>>>>> people are still relying on it we shouldn't make the change
> >yet.
> >> >>>>>> 
> >> >>>>>> ~Shea
> >> >>>>>> _______________________________________________
> >> >>>>>> nix-dev mailing list
> >> >>>>>> nix-dev at lists.science.uu.nl
> >> >>>>>> http://lists.science.uu.nl/mailman/listinfo/nix-dev
> >> >>>>>> 
> >> >>>>> 
> >> >>>>> _______________________________________________
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> >> >>>>> http://lists.science.uu.nl/mailman/listinfo/nix-dev
> >> >>>>> 
> >> >>>> 
> >> >>>> _______________________________________________
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> >> >>>> 
> >> >>>> 
> >> >>> 
> >> >>> _______________________________________________
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> >> >>> 
> >> >>> 
> >> > 
> >> >> _______________________________________________
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> >> > 
> >> > 
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> >> 
> >> —
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> >> Flying Circus Internet Operations GmbH · http://flyingcircus.io
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> >
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