[plt-scheme] Performance Targets for MzScheme

From: Matthias Felleisen (matthias at ccs.neu.edu)
Date: Thu May 13 13:27:37 EDT 2004

On May 13, 2004, at 1:18 PM, Neil W. Van Dyke wrote:

> Brent Fulgham <bfulg at pacbell.net> writes at 09:15 13-May-2004 -0700:
>> However, my goal was to identify places in MzScheme where performance
>> could be improved.  Currently, it looks like SRFI performance is quite
>> bad in some cases.
> Some SRFI reference implementation code contains some terribly
> inefficient pieces.
> (For example, a function that effectively feeds a string through a
> string port, converts that back to a string, feeds it through a string
> port again, back to a string, string port, string, string port, string.
> A compiler that could unravel all of that in reasonable time would be
> impressive.  Human intelligence can refactor the code or just rewrite 
> it
> from scratch.)
> You might run some of your real-world code under DrScheme's profiler,
> see which SRFI implementations are especially itchy, and scratch them.
> As you're improving on the SRFI reference implementations, keep the
> merge problem in mind.  I brutalized the SRFI-19 reference
> implementation by "tidying it up a bit" so I could understand it and
> work with it.  Others had also made substantial enough changes to the
> Schematics version of SRFI-19 that the three-way merge fell to the
> bottom of my priority list. :) http://www.neilvandyke.org/srfi19-plt/
> Actually, I decided what I really needed was not that hefty SRFI, but
> perhaps 100 bytes of MzScheme primitive. :)

We may provide that ability too soon. -- Matthias

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