[racket] why a segfault on the command line, but not in DrRacket?

Maybe it's a problem with the use of Cairo or Pango in `racket/draw`,
assuming that you're using `racket/draw` to produce PDF output.
If you can send me an example program that crashes, then I should be
able to sort it out.

At Tue, 30 Dec 2014 11:43:51 -0800, Matthew Butterick wrote:
> No, it's all Racket libraries.
> 
> OTOH I may be the one causing the memory-management problems. The issues
> are arising in my typesetting program, which passes around some large data
> structures as function inputs. By "large" I mean a list of 10e5 to 10e6
> structs, each with its own hashtable. Perhaps this is imprudent. It
> certainly makes the GC huff and puff (about 25-30% of my running time is
> GC)
> 
> OTOOH, it does seem to be a command-line peculiarity, because I haven't
> found a similar limit for DrRacket yet. For instance, I just typeset a file
> with 1.5M characters, resulting in a ~600 page PDF, and it ran fine.
> 
> When I tried running on the command line with this input, I got a different
> error than before (and within a couple seconds of starting the program):
> 
> Seg fault (internal error during gc) at 0x10aac0000
> Bus error: 10 (core dumped)
> 
> 
> 
> 
> On Tue, Dec 30, 2014 at 11:09 AM, Matthew Flatt <mflatt at cs.utah.edu> wrote:
> 
> > Does your program use any foreign libraries? That behavior sounds typical
> > of memory-management problems.
> >
> > > On Dec 30, 2014, at 11:47 AM, Matthew Butterick <mb at mbtype.com> wrote:
> > >
> > > I have a program that consistently works in DrRacket regardless of input
> > size.
> > >
> > > But on the command line, once input exceeds a certain threshold, the
> > program consistently dies with a "Segmentation fault: 11 (core dumped)"
> > error (though it works with smaller files). I'm invoking `racket` without
> > any special flags, like so:
> > >
> > > racket main.rkt
> > >
> > > I know which line of my program is triggering the segfault. But since
> > the error is related to the input size and the use of command-line Racket,
> > I think I ought to look elsewhere for the cause.
> > >
> > > Are there particular command-line flags that can be helpful in
> > diagnosing segfaults? Is a segfault like this typically due to running out
> > of memory?
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