On 2/23/07, David Balmain <[EMAIL PROTECTED]> wrote:
> On 2/21/07, Caleb Clausen <[EMAIL PROTECTED]> wrote:
> > Some more on this issue. I can narrow the crash down to an index with
> > just one document, and ferret crashes after getting its term vector a
> > number of times, perhaps as few as 2 or 3. The version below is tuned to
> > crash quickly on my system, others may find it necessary to give other
> > numbers in the command line argument in order to make the crash happen
> > sooner. See below for the code.
> >
> > Some fiddling with the ferret source code reveals that disabling the
> > call to tv_destroy() in frt_ir_term_vector() (which is the implmentation
> > of #term_vector) seems to make the problem go away. Experimenting with
> > tv_destroy(), I found that disabling just the frees of offsets and
> > positions is enough to keep the crash away. This suggests that there's a
> > mismanagement of the allocation of the associated variables, but if so I
> > was unable to spot it in the source....
> >
> > This is further than I've gotten in investigating this problem in a
> > while, but I'm unsure where to go next.
>
> Hi Caleb,
>
> After reading your first email I found the same things behavior as you
> describe here. This is very frustrating because in this case I create
> completely independent Ruby objects. They don't reference the Ferret
> data space at all so this was the last place I expected to have
> garbage collection problems. It makes no sense to me at all that not
> freeing the offsets and positions arrays should make any difference at
> all. If you have any more ideas with regard to this problem I'd love
> to hear them as it has me a little stumped.
I've made a little more progress on this. By disabling the garbage
collector while building the term_vector I can prevent the segfault. I
guess I need to spend some time to really understand how the ruby
garbage collector works.
Adding the top and bottom lines bellow prevents any segfault;
int old_dont_gc = rb_gc_disable();
rtv = frt_get_tv(tv);
tv_destroy(tv);
if (old_dont_gc == Qfalse) rb_gc_enable();
--
Dave Balmain
http://www.davebalmain.com/
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