[Beowulf] DMA Memory Mapping Question

Chris Samuel csamuel at vpac.org
Wed Feb 21 19:12:23 PST 2007

On Thu, 22 Feb 2007, Chris Samuel wrote:

> Through various firmware and driver tweaks (thanks to both IBM and Myrinet)
> we've gotten that limit up to almost 1GB and then we use an undocumented
> environment variable (GMPI_MAX_LOCKED_MBYTE) to say only use 248MB of that
> per process (as we've got 4 cores in each box), which we enforce through
> Torque.

On further probing it appears that those particular processes have somehow 
lost that environment variable on one node. :-(

So whilst it would be nice to be able to know how much DMA memory they are 
using we at least now know why the problem has suddenly reappeared.

 Christopher Samuel - (03)9925 4751 - VPAC Deputy Systems Manager
 Victorian Partnership for Advanced Computing http://www.vpac.org/
 Bldg 91, 110 Victoria Street, Carlton South, VIC 3053, Australia

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