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Fix recursive structure and setup precompilation
The recursive structure of SystemStructure was giving precompilation an issue so I removed that module. Then I setup precompilation on the basic interface. Test case: ```julia @time using ModelingToolkit @time using DifferentialEquations @time using Plots @time begin @variables t x(t) D = Differential(t) @nAmed sys = ODESystem([D(x) ~ -x]) end; @time prob = ODEProblem(structural_simplify(sys), [x => 30.0], (0, 100), [], jac = true); @time sol = solve(prob); @time plot(sol, idxs=[x]); ``` Before: ``` 11.082586 seconds (19.32 M allocations: 1.098 GiB, 4.09% gc time, 0.71% compilation time: 87% of which was recompilation) 0.639738 seconds (661.39 k allocations: 101.321 MiB, 4.33% gc time, 6.46% compilation time) 3.703724 seconds (5.71 M allocations: 322.840 MiB, 5.22% gc time, 9.92% compilation time: 86% of which was recompilation) 7.795297 seconds (8.25 M allocations: 483.041 MiB, 2.50% gc time, 99.88% compilation time) 21.719376 seconds (44.11 M allocations: 2.485 GiB, 5.68% gc time, 99.48% compilation time) 2.602250 seconds (4.04 M allocations: 253.058 MiB, 4.60% gc time, 99.90% compilation time) 2.450509 seconds (5.17 M allocations: 332.101 MiB, 5.89% gc time, 99.41% compilation time: 30% of which was recompilation) ``` After: ``` 9.129141 seconds (22.77 M allocations: 1.291 GiB, 4.65% gc time, 0.62% compilation time: 87% of which was recompilation) 0.784464 seconds (667.59 k allocations: 101.524 MiB, 3.95% gc time, 4.16% compilation time) 3.111142 seconds (5.42 M allocations: 305.594 MiB, 3.82% gc time, 6.39% compilation time: 82% of which was recompilation) 0.105567 seconds (157.39 k allocations: 10.522 MiB, 8.81% gc time, 95.49% compilation time: 74% of which was recompilation) 1.993642 seconds (4.03 M allocations: 218.310 MiB, 2.69% gc time, 96.95% compilation time: 82% of which was recompilation) 1.806758 seconds (4.06 M allocations: 254.371 MiB, 4.44% gc time, 99.91% compilation time) 1.694666 seconds (5.27 M allocations: 339.088 MiB, 6.18% gc time, 99.39% compilation time: 31% of which was recompilation) ``` And that's on v1.9, so v1.10 should be even better. 20 seconds off hehe.
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