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Describe Racket CS as the default.

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Relevant to #3663.
This commit is contained in:
Sam Tobin-Hochstadt 2021-01-29 21:56:48 -05:00 committed by Matthew Flatt
parent 0101f584fb
commit 32d3c8b607
1 changed files with 16 additions and 12 deletions
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28
pkgs/racket-doc/scribblings/guide/performance.scrbl
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@ -52,13 +52,25 @@ Non-interactive mode should be used instead of the
@section[#:tag "virtual-machines"]{Racket Virtual Machine Implementations} @section[#:tag "virtual-machines"]{Racket Virtual Machine Implementations}
Racket is available in three implementation variants: @deftech{3m}, Racket is available in three implementation variants: @deftech{CS},
@deftech{CGC}, and @deftech{CS}: @deftech{3m}, and @deftech{CGC}:
@itemlist[ @itemlist[
@item{@tech{3m} is the current default implementation, so it's @item{@tech{CS} is the current default implementation. It is
probably the one that you're using. a newer implementation that builds on
@hyperlink["https://www.scheme.com/"]{Chez Scheme} as its core
virtual machine. This implementation performs better than
the @tech{3m} implementation for most programs.
For this variant, @racket[(system-type 'vm)] reports
@racket['chez-scheme] and @racket[(system-type 'gc)] reports
@racket['cs].}
@item{@tech{3m} is an older variant, and was the default until version 8.0.
The implementation features a compiler and runtime written in C,
with a precise garbage collector and a just-in-time compiler (JIT)
on most platforms.
For this variant, @racket[(system-type 'vm)] reports For this variant, @racket[(system-type 'vm)] reports
@racket['racket] and @racket[(system-type 'gc)] reports @racket['racket] and @racket[(system-type 'gc)] reports
@ -75,15 +87,7 @@ Racket is available in three implementation variants: @deftech{3m},
@racket['racket] and @racket[(system-type 'gc)] reports @racket['racket] and @racket[(system-type 'gc)] reports
@racket['cgc].} @racket['cgc].}
@item{@tech{CS} is a newer implementation that builds on
@hyperlink["https://www.scheme.com/"]{Chez Scheme} as its core
virtual machine. This implementation performs better for some
programs, and it is likely to improve and eventually replace
the @tech{3m} implementation as the default.
For this variant, @racket[(system-type 'vm)] reports
@racket['chez-scheme] and @racket[(system-type 'gc)] reports
@racket['cs].}
] ]