[Yt-dev] Projection speed improvement patch

[John Wise]

On 8 Nov 2009, at 19:06, Matthew Turk wrote:
>
> I'm not sure what the deal is with OpenMPI on Ranger.  I'll see if I
> can replicate this and dig a bit deeper on Ranger tomorrow...
>

I tested some more on ranger, and I think it's ranger's fault.   
parallel projections work with mvapich+icc and openmpi+icc, but fails  
with openmpi+gcc.

When I tried to start a batch job on ranger with "ibrun tacc_affinity"  
while using openmp+gcc, tacc_affinity fails.  So python is never called.

I can get around this if I don't call tacc_affinity to control the  
processor / code placement, i.e.

ibrun mpi4py my_script.py --parallel

This is when I get the errors I posted.  I'm not sure whether this is  
worth debugging on yt's side because I think ranger is at fault here.

Sorry about the false alarm!  But I guess it's good to note this.

John