I have ported the dynamical core of our C++ CFD code to Julia a while ago, and see now huge speedups going from 1.8 to 1.9 (170 sec to 21 sec to first model step). Inspired by many discussions on this forum, I tried to precompile all functions triggered towards the first model step, but I do not see…

Could you try using SnoopPrecompile · SnoopCompile ?

I have followed the instructions at your suggested link and tried this, but the resulting load time is identical. ## Precompilation @precompile_setup begin include("precompile_settings.jl") @precompile_all_calls begin for float_type in [Float32, Float64] n_domains =…

The final result is below. I do not see any methods here from my own package, suggesting that the problem is elsewhere (or I did something wrong). julia> staletrees = precompile_blockers(trees, tinf) 2-element Vector{SnoopCompile.StaleTree}: inserting convert(::Type{T}, N::Union{Static.StaticBool{…

No, see the explanation in Invalidations findings (from a GMT case) - #32 by tim.holy . If you use ascend (see the SnoopCompile docs), you can see how methods used in your workload ultimately trace back to num_threads. You can see that invalidation is very expensive, more than 7s of compilation time.…

[image] tim.holy: you can see how methods used in your workload ultimately trace back to num_threads. You can see that invalidation is very expensive, more than 7s of compilation time. (The other one is negligible.) I think somewhere I saw @Elrod say that CPUSummary.num_threads method might be …

Minor remark: PolyesterWeave 0.1.13 still needs to get registered for the fix to be available publicly.

This is absolutely awesome, thanks to your fix following the analysis suggested by @tim.holy the compilation time has completely vanished!

Precompilation of complex code does not make time to first model step faster

General Usage

tim.holy January 3, 2023, 6:06pm 4

Try Julia v1.9.0-beta2 is fast - #17 by tim.holy ?

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Precompilation of complex code does not make time to first model step faster

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