[FLASH-USERS] Flash not running in LaserSlab in parallel

[David Blackman]

I've just had to learn how to compile it this morning as well. I don't 
know what system you're on, but you either need to link to a HDF5 
library that has been compiled specifically for parallel operation (for 
me on the Stampede2 cluster I had to load phdf5 instead of hdf5), or 
compile the HDF5 library with mpicc instead of gcc, or whatever compiler 
it is you use. There are specific instructions on the HDF5 website for 
compiling with MPI-I/O. https://support.hdfgroup.org/HDF5/PHDF5/

Good luck!

On 08/10/2020 05:05, Gabriel Perez Callejo wrote:
>
> Hello,
>
> I am new to Flash (I have just recently installed it), and I am having 
> some problems when running the LaserSlab example case in parallel.
>
> I have installed openmpi-4.0.5, hypre-2.12.0, hdf5-1.10.7, and 
> FLASH4.6.2. When I run the Sedov example using just
>
> /./setup -auto Sedov/
>
> /mpirun -np [number of cores] flash4/
>
> It runs perfectly. However, when I do the same with the LaserSlab example:
>
> /./setup -auto LaserSlab -2d +cylindrical +hdf5typeio -nxb=16 -nyb=16 
> species=cham,targ +mtmmmt +laser +uhd3t +mgd mgd_meshgroups=6 
> -parfile=example.par/
>
> /mpirun -np [number of cores] flash4/
>
> The code starts running, but freezes after /'Initial dt verified'/.
>
> Strangely enough, when the same setup command is run for LaserSlab, 
> but instead of running in parallel, FLASH is called to operate in 
> serial mode (./flash4), the code works without any problems (it just 
> takes a much longer time, obviously).
>
> From what I have gathered, this seems to be a problem with the hdf5 
> I/O, but I have been unable to solve it, and I don't know what might 
> be happening. Any thoughts about how to solve this?
>
> Thanks everyone,
>
> Gabriel Perez
>
>
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