[antlr-interest] Re: ANTLR vs FLEX/BISON: performance issues?

[gary_schaps]

Elias-

I have observed a 7X performance improvement in ANTLR 
generated compiler front ends through the use of aggressive
compiler optimization.  And my input sets are quite large
(>130 MB) so I have confidence that this is real.  I've 
achieved these results using the JOVE native compiler for
JAVA and the "-Ox" compiler flag in MSVC++ 6.0 for C++ with
two different compilers showing very similar results.

Gary Schaps

--- In antlr-interest at y..., Elias Biris <user_sofia at b...> wrote:
> Hi, 
> 
> thanks for this. It is the first reply I got :-)
> 
> I was thinking mainly whether the difference in performance in the
> generated parser has any similarity to the difference in
performance 
of
> the lexer side (as far as I know from reading the FAQ at jguru
there 
is
> an issue of performance of the lexer when compared to flex generated
> lexers).
> 
> Also I am interested in the issue of grammar inheritance: is that
> feasible in pccts at all? Has anyone tried this with ANTLR?
> 
> Best regards,
> 
> Elias
> 
> On Mon, 2002-09-02 at 23:22, Robert Sherry wrote:
> > Elias,
> > 
> >     I do not have any formal bench marks but, about 5 years ago,
I 
bench
> > marked an Antlr generated scanner against a Lex generated
scanner. 
I found
> > that the Antlr generated scanner ran at least as fast as the Lex 
generated
> > scanner.
> > 
> > 
> > 
> >     In addition, I have used both Yacc/Lex and Antlr.  I 
personally believe
> > the Antlr is the better tool.
> > 
> > In addition, it is better supported.
> > 
> > 
> > 
> > 
> > 
> > 
> > Robert Sherry
> > 
> > ----- Original Message -----
> > From: "Elias Biris" <user_sofia at b...>
> > Newsgroups: comp.compilers
> > Sent: Saturday, August 10, 2002 2:33 AM
> > Subject: ANTLR vs FLEX/BISON: performance issues?
> > 
> > 
> > > Hello,
> > >
> > >  I just discovered antlr and its earlier flavour, pccts.
> > >
> > >  I was wondering whether there is any published material, 
preferably with
> > >  sample code, that atests for the performance characteristics of
> > >  lexers/parsers generated by antlr (primarily, I am also 
interested in
> > >  similar material for pccts, if there is any) vs the same 
lexer/parser as
> > >  generated by flex and bison.
> > >
> > >  Has anyone got any idea where to find something like that? All 
tips and
> > >  pointers will be gratefully appreciated :-)
> > >
> > >  Thanks
> > >
> > >  Elias Biris
> > 
> >


 

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