Re: [Users] strong scaling tests on Stampede (TACC)

Hi,

On Thu, Feb 21, 2013 at 06:31:23PM -0700, Bruno Giacomazzo wrote:

I found out that the problem is due to 1D ASCII output (which is active in that parfile) and that makes the runs particularly slow above ~100 cores on this machine.

That is not not just on this machine. xD output with x>=1 doesn't scale. Anywhere. Use HDF5, except for debugging where ASCII might be more convenient and you don't care about performance. There isn't much you could do about that without changing CarpetIOASCII.

and hence I didn't plot them in the other figure). I didn't try using 1D hdf5 output instead, does anyone use it?

Not 1D, but 2D, and that works very well.

Frank