Re: Measuring/improving performance

From: John D. Pritchard <>
Date: Wed, 12 Apr 1995 14:24:57 -0400

well, this is barely any help, but i'm very interested in "obliq"
which is a network objects interpreted language implemented on top
of modula-3. for info see

<DT><A HREF="">Obliq Quick Start</A>
<DT><A HREF="">Digital Systems Research Center Home Page</A>
<DT><A HREF=""></A>

home page</A>

Research Reports</A>

> From: Andrew Joseph Kompanek <>
> Date: Wed, 12 Apr 1995 13:12:43 -0400 (EDT)
> To:
> Subject: Measuring/improving performance
> Message-ID: <>
> I've written a parser that interprets a simple text-based distributed object
> protocol (it simply supports sending objects and their attribute values)
> and turns it into scheme/stklos data structures.
> It ends up being horrendously slow -- something like a list only about
> 50 simple objects a second.
> It has two layers:
> - a simple tokenizer: the tokens are just delimiters and strings
> of characters separated by whitespace. I use read-char and
> peek-char and a simple case to convert a character into
> a symbol standing for a delimiter.
> - a simple parser: when the expression parser recognizes a delimiter
> it calls the associated parser for the expression type.
> I'm not sure if this is enough information -- but I'm trying to decide
> how to go about profiling where the program is spending its time and
> then figure out if there's anything I can do to speed things up,
> including implementing parts in C. I suspect that it spends most
> of its time manipulating data structures... which makes me think
> that implementing control and I/O in C wouldn't speed things
> up significantly.
> The code is quite simple... it's EXTREMELY distressing that it's
> as slow as it is -- basically unacceptable for the application
> I'm working on.
> Any help would really, really appreciated -- anything about profiling,
> advice on places to look for bottlenecks, how much of a speed
> gain you can get doing different things in C, etc...
> Thanks,
> Drew
Received on Wed Apr 12 1995 - 20:26:28 CEST

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