On 02/22/2018 07:50 AM, Christopher Benjamin Coffey wrote:
It’s a big deal if folks use -n when it’s not an mpi program. This is because 
the non mpi program is launched n times (instead of once with internal threads) 
and will stomp over logs and output files (uncoordinated) leading to poor 
performance and incorrect results.

I have a LAMMPS user who has been bugging me for weeks about a problem where if she runs the code by hand she gets useable output, but when she submits it with sbatch she gets garbage and couldn't figure out why. So, I finally made her come to my office to show me what she's doing, and sure enough, I found this in her submit file:

   #SBATCH --ntasks=4

and wouldn't have thought about it if I hadn't read your email this morning.

So, thanks!  <:)

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