Racket v7.3

[John Clements]

----------------------------------------------------------------------
Racket version 7.3 is now available from

https://racket-lang.org/

Racket-on-Chez continues to improve. Snapshot builds are currently
available at pre.racket-lang.org, and we expect that Racket-on-Chez
will be included as a download option in the next release.

In addition, the Racket 7.3 release includes the following improvements:

- There is a new set of teaching languages for the upcoming
German-language textbook "Schreibe Dein Programm!"
(https://www.deinprogramm.de/).

- Racket's IO system has been refactored to improve performance
and simplify internal design.

- Racket's JSON reader is dramatically faster.

- The `plot` library includes color map support for renderers.

- The Racket web library has improved support for 307 redirects.

- The Racket web server provides better response messages by default
for common status codes.

- The `pict` library includes a `shear` function.

The following people contributed to this release: Alex Harsányi,
Alexander McLin, Alexander Shopov, Alexis King, Alex Knauth, Andrew
Kent, Bert De Ketelaere, Ben Greenman, Fred Fu, Georges Dupéron, Greg
Hendershott, Gustavo Massaccesi, Jay McCarthy, Jesse Alama John
Clements, Jordan Johnson, Kimball Germane, Lassi Kortela, Leif Andersen
Leo Uino, Marc Kaufmann, Matthew Butterick, Matthew Flatt, Matthias
Felleisen Michael MacLeod, Mike Sperber, Paulo Matos, Philip McGrath
Philippe Meunier, Pierre-Evariste Dagand, qww6, Robby Findler, Ron
Garcia, Ryan Culpepper, Ryan Kramer Sam Tobin-Hochstadt, Shu-Hung You,
Sorawee Porncharoenwase, Spencer Florence Spencer Mitchell, Stephen De
Gabrielle, Vincent St-Amour, Vladilen Kozin, Winston Weinert, yjqww6,
and Wayo Cavazos

Feedback Welcome

----------------------------------------------------------------------

[Laurent]

Thank you all for the new release!

On Wed, May 15, 2019 at 7:05 PM 'John Clements' via Racket Users <racket...@googlegroups.com> wrote:

- Racket's IO system has been refactored to improve performance
 and simplify internal design.

 

Is it mild overall performance improvement, or are there cases where there can be a big boost? (Like "previous bottlenecks have become highways" kind of improvement)

[Dexter Lagan]

A huge thanks to everybody who worked on Racket.

 

  IO improvements will surely make everybody’s life a little better in my team and the whole studio. We’re relying on large (200MB text files), and numerous (in the 100,000’s) file reads and writes daily. We’re converting shell scripts to Racket and I recon it’s hard to beat some GNU command’s optimizations. I have been tempted to try Rust but a) it’s not guaranteed to perform better for pure IO, and b) I’d rather code it directly in macro-asm if it meant better speed. But so far, Racket’s performance has been more than adequate for our tasks, and thanks to this I can do it all in Racket. That puts a big, gleeful smile on my face.

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[Asumu Takikawa]

On 2019-05-15 14:05:48 -0400, 'John Clements' via Racket Users wrote:
> Racket version 7.3 is now available from

For anyone using Ubuntu, the Racket PPA has been updated for 7.3 too:

https://launchpad.net/~plt/+archive/ubuntu/racket

It's available on disco (19.04), cosmic (18.10), bionic (18.04), xenial
(16.04), and trusty (14.04).

Please report any issues on github:

https://github.com/takikawa/racket-ppa

Cheers,
Asumu

[Piyush Katariya]

I am also keen to know the IO perf optimization results in real world.

Dexter, if possible can you give us some approximate throughput or latency numbers when you switch to v7.3 

[Dexter Lagan]

  I’ll compare file write times as soon as we’re done testing the tool I’m working on.

Cheers

Dex

On May 16, 2019, at 10:03 PM, Piyush Katariya <corporat...@gmail.com> wrote:

I am also keen to know the IO perf optimization results in real world.

Dexter, if possible can you give us some approximate throughput or latency numbers when you switch to v7.3 

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[Matthew Flatt]

Number parsing in `read` or `string->number` should be faster, but the
main I/O refactoring and improvements were specific to Racket-on-Chez.

In the long run, this new I/O implementation might replace the current
one in the traditional Racket implementation, but I don't know how much
of a performance different it would be.

(I recommended dropping this bullet from the announcement, since the
main changes were mainly for Racket-on-Chez. But I guess that
recommendation was too buried or got lost.)