Long RTL generation times

Question

Long RTL generation times

Opened this issue 4 years ago · 9 comments

Runtime for generating the 32x16 array of tiles (with the interconnect only option) has crept back up to ~25 minutes. It was around 5 minutes during the tapeout last year.

Kuree commented 4 years ago

Yes

Answer 1 · 2020-03-11T18:36:33.000Z

That's weird. @leonardt - what was the command you used to profile the python runtime last time?

Answer 2 · 2020-03-11T19:56:22.000Z

I used cprofile: https://docs.python.org/3.7/library/profile.html

Answer 3 · 2020-03-11T20:35:46.000Z

thanks @leonardt.

@alexcarsello can you run cprofile and paste the output here so we can see what's happening?

Answer 4 · 2020-03-17T01:21:01.000Z

@alexcarsello how are we looking on this?

Answer 5 · 2020-05-06T17:41:10.000Z

Just my own datapoint. On kiwi with update-to-date dependencies, 12x12 takes about 7 minutes to generate. Just for comparison, last year 12x12 takes about 1 minutes to generate.

Answer 6 · 2020-05-06T18:39:34.000Z

To confirm you're running python garnet.py --width 12 --height 12 --verilog ?

I can c-profile and check that it's not anything silly if it is blocking.

Answer 7 · 2020-05-07T18:57:15.000Z

@rsetaluri can you try phanrahan/magma#701 and see if it helps?

Answer 8 · 2020-05-07T19:05:03.000Z

@leonardt turns out a lot of the time discrepancy is due a gemstone-level issue (not caching properly).

Could be that further magma optimizations could help also. Will try this out, thanks.