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Sam Tobin-Hochstadt 34fdd2863a Avoid traversing immutable vectors when specified.
This adds #:eager as an option for controlling this behavior.

Using `#:eager 10` is a 2x improvement in performance for configuration 010001
of the suffixtree benchmark from Takikawa et al, POPL 2016.

The default behavior is unchanged. This is configurable because some
programs are much faster when eager checking is performed. For example:

(require racket/contract)
(collect-garbage)
(time (for/sum ([_ 100000])
        (vector-ref (contract (vectorof integer? #:eager #t) #(1) 'pos 'neg)
                    0)))
(collect-garbage)

(time (for/sum ([_ 100000])
        (vector-ref (contract (vectorof integer? #:eager #f) #(1) 'pos 'neg)
                    0)))

The second loop is 3-4 times slower than the first. However, making
the vector much larger will make the difference go the other way.
2016-11-22 11:28:30 -05:00
pkgs Avoid traversing immutable vectors when specified. 2016-11-22 11:28:30 -05:00
racket Avoid traversing immutable vectors when specified. 2016-11-22 11:28:30 -05:00
.gitattributes Don't include git files in archives. 2010-05-12 01:46:05 -04:00
.gitignore Add *.orig, *.rej and *.core files to gitignore. 2015-11-06 10:25:13 -06:00
.mailmap mailmap updates & fixes. 2013-04-03 18:10:22 -04:00
.travis.yml Fix CI tests for match test move. 2015-12-30 10:39:45 -05:00
appveyor.yml Fix CI tests for match test move. 2015-12-30 10:39:45 -05:00
INSTALL.txt Corrected a few typos in INSTALL.txt 2016-06-02 13:39:39 -05:00
Makefile Moved xrepl to be part of bootloader directly. 2016-07-26 10:14:38 -04:00
README.md Add info to README. 2016-07-13 10:38:54 -04:00

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This is the source code for the core of Racket. See "INSTALL.txt" for full information on building Racket.

To build the full Racket distribution from this repository, run make in the top-level directory. To build the Minimal Racket, run make base.

The rest of the Racket distribution source code is in other repositories under the Racket GitHub organization.

Contribute to Racket by submitting a pull request, joining the development mailing list, or visiting the IRC channel.

License

Racket Copyright (c) 2010-2016 PLT Design Inc.

Racket is distributed under the GNU Lesser General Public License (LGPL). This implies that you may link Racket into proprietary applications, provided you follow the rules stated in the LGPL. You can also modify Racket; if you distribute a modified version, you must distribute it under the terms of the LGPL, which in particular states that you must release the source code for the modified software.

See racket/src/COPYING_LESSER.txt for more information.