[antlr-interest] C target memory usage

[Jim Idle]

There is only going to be a C++ target for v4 - I don't have time to write
it though and so I think that Sam will likely do that. The same things
will apply to C++ as C# and generally it should be a lot faster.

Jim

> -----Original Message-----
> From: antlr-interest-bounces at antlr.org [mailto:antlr-interest-
> bounces at antlr.org] On Behalf Of A Z
> Sent: Friday, December 23, 2011 7:09 PM
> To: Richard Gildea
> Cc: antlr-interest at antlr.org
> Subject: Re: [antlr-interest] C target memory usage
>
> Hi Richard,
>
>   I see about 140:1 for the ratio of memory use to input size on a 64-
> bit system. This is after I hacked commontoken to remove most of the
> function pointers, which halved the size of the tokens. I didn't
> investigate any further as I recall an email thread about ANTLR 4
> indicating it would use 8-byte tokens instead of the 200+ byte tokens
> 3.4 uses.
>
>
> Looks like it may only be for C#.
> http://markmail.org/message/eggfcjt3a6qdzkvc
>
> Ad
>
>
> On Fri, Dec 23, 2011 at 10:00 AM, Richard Gildea <rgildea at gmail.com>
> wrote:
>
> > Hi,
> >
> > We have been successfully using antlr in the form of the C target for
> > some time, however we have recently noticed that the memory
> > consumption can be quite large - up to 150 times the size of the
> input
> > file. Is this factor of
> > ~150 to be expected, or does it indicate that we may be doing
> > something wrong? For the vast majority of possible inputs this does
> > not cause a problem, however some input files can be as large as 0.5
> > Gb, giving a peak memory usage of 75 Gb - not exactly feasible on
> most machines!
> >
> > Does anyone have any examples of using a custom lexer that provides a
> > token buffer rather than storing all tokens in memory?
> >
> > Cheers,
> >
> > Richard
> >
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