Bug#555714: mpich2: Please add support for blcr

[Lucas Nussbaum]

On 23/10/10 at 12:51 -0500, Pavan Balaji wrote:
> 
> On 10/23/2010 12:40 PM, Lucas Nussbaum wrote:
> >On 11/11/09 at 10:15 -0600, Pavan Balaji wrote:
> >>We had a short discussion on this within the MPICH group. We believe
> >>that we will be able to modify the code such that enabling it at
> >>configure time should not add any additional performance overhead
> >>for applications that don't need this support. So starting
> >>mpich2-1.3, you should be able to configure it in by default.
> >
> >Hi Pavan,
> >
> >What's the conclusion on this? Should I enable checkpointing by default?
> >(Context: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=555714)
> 
> There will be some overhead in enabling this, but I think that
> should be minimal. I'm checking with our developer who worked on
> this. I'll get back to you.

Apparently, if you enable it at build time, it then fails at runtime if
blcr support is not present in the kernel. So I've left it disabled for
now.

Lucas