[Numpy-discussion] Should I use pip install numpy in linux?

[Robert McGibbon]

> Doesn't building on CentOS 5 also mean using a quite old version of gcc?

I have had pretty good luck using the (awesomely named) Holy Build Box
<http://phusion.github.io/holy-build-box/>, which is a CentOS 5 docker
image with a newer gcc version installed (but I guess the same old libc).
I'm not 100% sure how it works, but it's quite nice. For example, you can
use c++11 and still keep all the binary compatibility benefits of CentOS 5.

-Robert

On Fri, Jan 8, 2016 at 7:38 PM, Nathaniel Smith <njs at pobox.com> wrote:

> On Fri, Jan 8, 2016 at 7:17 PM, Nathan Goldbaum <nathan12343 at gmail.com>
> wrote:
> > Doesn't building on CentOS 5 also mean using a quite old version of gcc?
>
> Yes. IIRC CentOS 5 ships with gcc 4.4, and you can bump that up to gcc
> 4.8 by using the Redhat Developer Toolset release (which is gcc +
> special backport libraries to let it generate RHEL5/CentOS5-compatible
> binaries). (I might have one or both of those version numbers slightly
> wrong.)
>
> > I've never tested this, but I've seen claims on the anaconda mailing
> list of
> > ~25% slowdowns compared to building from source or using system packages,
> > which was attributed to building using an older gcc that doesn't
> optimize as
> > well as newer versions.
>
> I'd be very surprised if that were a 25% slowdown in general, as
> opposed to a 25% slowdown on some particular inner loop that happened
> to neatly match some new feature in a new gcc (e.g. something where
> the new autovectorizer kicked in). But yeah, in general this is just
> an inevitable trade-off when it comes to distributing binaries: you're
> always going to pay some penalty for achieving broad compatibility as
> compared to artisanally hand-tuned binaries specialized for your
> machine's exact OS version, processor, etc. Not much to be done,
> really. At some point the baseline for compatibility will switch to
> "compile everything on CentOS 6", and that will be better but it will
> still be worse than binaries that target CentOS 7, and so on and so
> forth.
>
> -n
>
> --
> Nathaniel J. Smith -- http://vorpus.org
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