[mpich-discuss] bug when used with valgrind

[Dave Goodell]

On Jan 24, 2013, at 7:52 AM CST, Evren Yurtesen IB wrote:

> On Wed, 23 Jan 2013, Dave Goodell wrote:
> 
>> On Jan 23, 2013, at 12:22 PM CST, Evren Yurtesen IB wrote:
>> 
>>> https://bugs.launchpad.net/ubuntu/+source/mpich2/+bug/1045326
>> 
>> Pavan Balaji, who commented 2012-09-03, represents "us" on this matter.
> 
> Oh ok, but should I create a bug report as he suggested?

I don't personally think that's necessary.  There's nothing that we can really do about the problem, and there's already enough google-bait on the issue on both that launchpad bug and on the mailing list archives for this list.

Thanks for following up with us.

>> Based on what Paul said in that link and some cursory googling, it sounds like that issue was never upstreamed to the Valgrind folks.
> 
> I will try to poke valgrind developers also :)

OK.  I monitor their lists and I'll keep an eye on the thread you started.  For anyone who is reading this in our list archives, here's the thread: http://thread.gmane.org/gmane.comp.debugging.valgrind.devel/21882

>> I agree with you that the easiest way to resolve the Launchpad bug is to just omit the checkpointing arguments, although this has the downside of disabling this functionality.  A more involved fix would be to patch the BLCR library in the fashion mentioned in the lbl.gov link above.
> 
> I think it is already non-functional for Ubuntu 12.04+ versions. There is also a bug report about BLCR because it does not work with 3.x kernels anymore and all 12.* Ubuntu versions use 3.x kernels:
> https://bugs.launchpad.net/ubuntu/+source/blcr/+bug/804943
> 
> Also checkpoint homepage confirms this (last version supports up to kernel 2.6.38):
> https://ftg.lbl.gov/projects/CheckpointRestart/
> 
> So, I think it may be possible to convince Ubuntu package makers to remove checkpoint options which are not useful anyway. But I am not sure who to inform about this problem at this point.


It does sound like disabling BLCR makes the most sense on modern Ubuntu versions.  Hopefully enough comments to that effect on the ticket will cause someone to wakeup an pay attention.

-Dave