[FLASH-USERS] Scaling up LaserSlab to larger box size?

[David Montgomery]

Dear FLASH User Community,

FLASH newbie here, running FLASH 4.8 on laptop with macOS 15.5.

Successfully ran the default LaserSlab problem with mpirun -np 8 ./flash4, output looks great. Took 4 hours wall time on my laptop, not too bad.

Suppose I want to scale up the problem to run with a 40TW laser, laser radius of 800-microns super-Gaussian profile, parylene target thickness of 50-microns, and target radius of 1500-microns, with a 2000-microns “vacuum” region of low-density Helium (possibly using gamma = 1.1 EOS as suggested elsewhere).

I’ve Googled the threads, saw the thread on “Scaling problems” but haven’t really found what I’m looking for.

If I do scale up the box size, how long of a “wall clock” time would I expect with the same 8 processors?

Is this a problem that I should consider running on a HPC system to get similar wall-clock run times, or could I still use a laptop with more processors?

Just trying to best understand the computational needs, setting block sizes, etc.

Thanks again for your help,

David Montgomery
FLASH newbie
LANL, Guest Scientist



-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://flash.rochester.edu/pipermail/flash-users/attachments/20250609/7a8b7442/attachment.htm>