Re: [Valgrind-users] Helgrind hang with 3.9

[Philippe W. <phi...@sk...>]

On Mon, 2013-11-18 at 11:40 +0100, Benjamin Schindler wrote:
> Hi
> 
> I just upgraded to valgrind 3.9.0 (debian sid backport). Most features 
> work, but helgrind hangs with my application, and starts to fill up 
> memory until the system starts swapping badly. This did not happen with 
> 3.8. I tried with and without the suppressions file I'm using but that 
> doesn't help.
> The only thing that might be an issue is that the application uses cuda 
> and helgrind used to throw a lot of errors concerning cuda (all of which 
> I dealt with using a suppression file)
> 
> Is this something known or is there a way I can debug this further?

You can try several things to get more info about what is going on:
* run with --profile-heap=yes
   This will regularly provide details about who allocates what
* together with the above, you can also use gdb+vgdb to debug
  your app running under valgrind, and use
    monitor v.info memory aspacemgr
  to get memory details at selected places.

It might be interesting to do the above with 3.8.1 and 3.9 and look at
the differences.
Note that in 3.9.0, several arenas (kind of memory
zones of the valgrind allocator) have been merged together.

Philippe