[Jprogramming] JE contributions WAS: J903-beta-c

['Pascal Jasmin' via Programming]

The core performance bottleneck with extended precision numbers in J is that they are stored in base 10.  That decision does come with a performance advantage of its own:  input and display.  I'd favour the move to 32/64 bit storage even if it "broke" the 3!:1 format (although 3!:1 could convert to old storage style).  J is already shipping with openssl that has large integer operations.  Is there that big a case to add GMP as a dependency?






On Wednesday, February 3, 2021, 09:47:51 a.m. EST, Henry Rich <henryhrich at gmail.com> wrote: 





IF you want to get yourself in shape to make JE changes, I have a 
starter project for you: replace the extended-integer and rational 
support with GMP (or some other equally-good library).  The current code 
is serviceable but sized for 32-bit machines, and lacks fast multiplication.

The code resides in vx.c and vq.c, which would be replaced with new 
versions.  There are also bits in k.c (conversions) and d.c (display).

I will help as needed.

Henry Rich

On 2/1/2021 11:25 PM, ethiejiesa via Programming wrote:
> Raul Miller <rauldmiller at gmail.com> wrote:
>> https://github.com/jsoftware/jsource/commits/master might interest you...
> Indeed, I have the repo cloned locally!
>
> However, when digging through old bug reports, I find it quite challenging to
> match up the "fixed" notices with the corresponding code commits. In cases with
> a clear test case demonstrating the bug, we can use git-bisect to sleuth out
> the commit that eliminates the failure. However, cases without this almost
> invariably defeat my investigative skills.
>
> For posterity's sake, and if it's not too much of a hassle, I thought it might
> be helpful to have some commits/diffs/comments attached to those "fixed"
> messages.
>
> I will admit to a bit of an ulterior motive here, though.
>
> Bill, Eric, and Henry have deep domain knowledge about JE. I am personally
> hoping that sharing the diffs would also spark discussion and give a natural
> avenue to share and spread such expertise.
>
> The gory details are exceptionally interesting!
>
>
> Permit me to query a broader point, though.
>
> It strikes me that the git-shortlog on the repo is very short:
>
>      $ git shortlog --summary
>      6    Chris Burke
>      231    Eric Iverson
>      1430    HenryHRich
>      1    bill
>      597    bill lam
>      3    cdb
>      3    kbi
>
> For the most part, we only have 3 devs, with all of them part of the old guard,
> per se. Better yet, Henry has authored over 62% of all commits! Granted, this
> only reflects the history from 2016 onward, but my question is this: Do we have
> up and coming JE hackers that can pick up the torch when the time comes?
>
>
> Anyway, maybe JSoftware has a vision for the future that I've failed to pick up
> on. The ulterior motive behind my "share a bit about the fix" is to perhaps
> open a channel with the community that sucks in potential JE devs like myself!
> I was just trying to be sneaky about things by suggesting something very simple
> and, hopefully, hassle-free.
>
>
> 2!:55
> ----------------------------------------------------------------------
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