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Electronics => PCB/EDA/CAD => Topic started by: ts125rider on December 04, 2021, 06:06:51 pm

Title: LTSpice runs slow on Apple Silicon M1
Post by: ts125rider on December 04, 2021, 06:06:51 pm
Hi folks!

I've got this new Apple Macbook Air M1 with 8 CPU, 8 GPU cores and 8GB of RAM.
I've tried to run an LTSpice simulation on this machine. The simulation took about 20 minutes to finish on a Dell XPS 13 (i5-1135G7, 8GB RAM) and about 30 minutes to finish on a desktop PC (i5-6600K, 16GB RAM).

The simulation never finished on the Macbook, because I've stopped it after 1.5 hours (around 45% completion). There was no convergence issues, since other two machines could run it perfectly fine, also the Macbook never stuck in a single timestep, however it calculated the timesteps very slowly.
I have to admit that the simulation isn't the most optimized, but it is definitely can be solved.

I'm using the latest version of the program which is ported to Apple Silicon M1, so it runs natively, however the activity monitor only about 15% processor utilization when I run the simulation. The backside of the Macbook is cold so there is no thermal throttling.

Have anybody experienced similar thing? Do you have any idea how can I increase the simulation performance?

Thanks,
Mate