On 11/11/2009 06:08 AM, Lucas Nussbaum wrote: >> Since BLCR is now in the archive it would be nice if mpich2 was built >> using this library to provide checkpoint support. The attached patch >> enables this at configure time.
Ooh, I'd not recommend that for two reasons: 1. BLCR support is experimental in the mpich2-1.2.x series. It's really meant for the mpich2-1.3.x series, preview releases of which should start coming out in Jan 2010. 2. Checkpoint restart support is, in general, an expensive operation. Even if the application doesn't checkpoint, the internal bookkeeping required will hurt performance a little. So, even in the mpich2-1.3.x series, I'm not sure how good an idea it is to enable it by default. You might instead want to consider providing mpich2-blcr as a separate package? Alternatively, we can consider protecting blcr based code by a runtime option, as opposed to a compile-time option. This will still hurt performance a little, but might be a lot more manageable. Let me check with the developer who is adding this support and see what he thinks. -- Pavan -- Pavan Balaji http://www.mcs.anl.gov/~balaji -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
