> The sequencer wild pointer problem is next. I don't hold a lot of hope
> for getting this one fixed any time soon. I may have to review the
> sequencer code to find it. I'm not sure that tools like valgrind will
> be of any use given that they will slow things down to a crawl. I'll
> have to dig up my notes on this and see if there's a tool out there
> that will find this for me quickly.
I have just a little experience running valgrind on Rosegarden. It can be
done, but it is painful and you are right to look for a better way.
A few observations in no particular order:
* It slows things down, but a more pressing problem is that valgrind
makes a ton of output. So much that even grepping it gives too much
output to eyeball.
* If you do choose valgrind, I have a rudimentary valgrind-suppress file
for RG. I'll commit it if you have any use for it. That cuts down the
output a lot (maybe 95%), but there's still half a ton of it. I made
this file quick-and-dirty by editing the --gen-suppressions=all output,
so it's only a little better than gen-suppressions itself. The command
line flag is --log-file=../valgrind-results
* I don't still have any of the valgrind outputs. They were many
meghabytes of highly repetitive text. But from memory and notes:
* I saw zero stray writes other than the ones I was looking for (caused
by a race condition, staunched in 12.04). Which co-incidentally was
the ALSA/Sequencer/SequencerThread again. But that's from a short
session where I exercised only that.
* RG has serious memory leaks. Not news to anybody, I'm sure. But
quantifying it, a short session showed something like 130K that was
alloced and lost. I don't think it's practical to chase that all down
thru valgrind.
* The most suspicious thing in general is that we're getting a number
of malloc-in-alloc'd block problems. So many that I actually suspect
it's an artifact of valgrind, or else we'd be crashing more often.
Often associated with these libraries:
* Curl
* libraptor
* Lrdf
* libasound
Hope this info is of some use to you.
Tom Breton (Tehom)
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