Re: [JAVA] Arrow performance measurement

[Animesh Trivedi <an...@gmail.com>]

Hi Wes, sure. I opened a ticket and will do a pull request.

Cheers,
--
Animesh

On Fri, Nov 30, 2018 at 5:28 PM Wes McKinney <we...@gmail.com> wrote:

> hi Animesh -- can you link to JIRA issues about the C++ improvements
> you're describing? Want to make sure this doesn't fall through the
> cracks
>
> Thanks
> Wes
> On Mon, Nov 26, 2018 at 7:54 AM Antoine Pitrou <an...@python.org> wrote:
> >
> >
> > Hi Animesh,
> >
> > Le 26/11/2018 à 14:23, Animesh Trivedi a écrit :
> > >
> > > * C++ bitmap code can be optimized further by using the unsigned
> integers
> > > than "int64_t" for bitmap checks, and eliminating the kBitmap. See here
> > > https://godbolt.org/z/deq0_q - compare the size of the assembly code.
> And
> > > the performance measurements in the blog show up to 50% performance
> gains.
> > > Alternatively if signed to unsigned upgrade is not possible (perhaps in
> > > every language), then in the C++ code, we should use the bitmap
> operations
> > > directory ( `<<3` for division by 8, and ` & 0x7` for modulo by 8
> > > operation), instead of `/` and `%`.
> >
> > Thank you for noticing this.  Switching to unsigned (and do a
> > static_cast to unsigned) sounds good to me.
> >
> > Regards
> >
> > Antoine.
>