Performance changes made by claude

[imreddyTeja]

Purpose

I let a claude agent iterate on clima using a gpu and the repl plugin I made. An extremely slowest part of prognostic edmf with 1M microphysics is microphysics_tendencies_1m( #microphysics_tendencies_quadrature_1m.

Optimizing this function using the "longrun_aquaplanet_allsky_progedmf_1M.yml" config in ClimaAtmis, this is what it came up with.
The performance is dependent on the state of the simulation because the frequent usage of conditionals within that kernel. In general, it seems like the kernel now takes 50% the time it used to. A test of it in nightly amip's performance test is

SYPD Using this branch : 0.295
SYPD Using the last release of CM : 0.262

To-do

• Run full nightly amip with this. I am a bit concerned about the different NaN and edge case handling behavior of the fast math implementations vs IEEE. This cannot be done unless I apply these commits to v0.36 (this is how tested)

As a follow up, I tried using fast math at the CUDA.jl level in ClimaCore, but there seems to be issues with using both always_inline and fast_math in very deeply nested broadcasted expressions.

Content

• Annotates lines with fastmath

---

• I have read and checked the items on the review checklist.

[codecov]

Codecov Report

❌ Patch coverage is 94.06780% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 92.72%. Comparing base (72fa274) to head (5f3c076).
⚠️ Report is 12 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #751      +/-   ##
==========================================
- Coverage   92.96%   92.72%   -0.25%     
==========================================
  Files          56       56              
  Lines        2859     2888      +29     
==========================================
+ Hits         2658     2678      +20     
- Misses        201      210       +9     

Components	Coverage Δ
src	93.51% <96.71%> (-0.26%)	⬇️
ext	69.47% <ø> (ø)

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[tapios]

Nice! Looks good to me.

Did you compare SYPD after #750?

[haakon-e]

Nice, I will see what translates from here once #731 is next in line to be merged.

[trontrytel]

@imreddyTeja - should we merge this?

[imreddyTeja]

@trontrytel
I haven't been able to test this yet due to compatibility issues, but those should be resolved by tonight. Even after testing, I'm not sure if this should be merged because of fastmath's different behavior.