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Subject: Re: [isocpp-lib-ext] [isocpp-parallel] Reducing the number of numeric algorithms in namespace ranges
From: Chuck Allison (chuck.allison_at_[hidden])
Date: 2019-06-27 12:56:45


I assume you were mainly talking about omitting the parallel versions of certain algorithms. I think we should still cover copy_if, which was left out of C++98, and other C++11 additions, etc.

Chuck Allison
On Jun 27, 2019, 5:53 AM -0600, Christopher Di Bella via SG20 <sg20_at_[hidden]>, wrote:
>
>
> > On Thu, 27 Jun 2019 at 12:08, Bryce Adelstein Lelbach aka wash <brycelelbach_at_[hidden]> wrote:
> > > Thanks Billy and Jonathan. This is really interesting data to have. I hadn't realized how big of an impact this was!
> >
> > +1
> >
> > I'm very appreciative for the data here too; at the very least, it's super interesting! It also certainly underlines caution received in this thread about marrying the C++98 algorithms with the C++17 ones.
> > I'm sceptical about there being a usable, non-intrusive, and universal way to marry the two, but will give it some thought.
> >
> > Perhaps the initial proposal should only cover the C++98 numeric algorithms to lay the groundwork, and have a sequel look at the C++17 ones?
> > Just covering the C++98 algorithms will be moderately sized.
> >
> > >
> > > > On Thu, Jun 27, 2019 at 2:25 AM Jonathan Wakely <cxx_at_[hidden]> wrote:
> > > > >
> > > > >
> > > > > > On Tue, 25 Jun 2019 at 19:25, Billy O'Neal (VC LIBS) via Lib-Ext <lib-ext_at_[hidden]> wrote:
> > > > > > > To put some numbers to that, on our (MSVC++’s) implementation:
> > > > > > >
> > > > > > > <19D76826F0A44A619012717C96F5C229.png>
> > > > > > >
> > > > > >
> > > > > > Roughly comparable numbers using GCC (where the reduce_par algo uses Intel's PSTL and TBB), so I think it's safe to say that std::reduce is valuable even in the non-parallel case:
> > > > > >
> > > > > > <reduce.png>
> > > > > >
> > > > > >
> > > > > _______________________________________________
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> > > > > Link to this post: http://lists.isocpp.org/parallel/2019/06/2753.php
> > >
> > >
> > > --
> > > Bryce Adelstein Lelbach aka wash
> > > CUDA Core C++ Libraries (Thrust, CUB, libcu++) Lead @ NVIDIA
> > > ISO C++ Library Evolution Incubator Chair
> > > ISO C++ Tooling Chair
> > > CppCon and C++Now Program Chair
> > > CUDA Convert and Reformed AVX Junkie
> > >
> > > Sleep is for the weak
> > > --
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