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Test allocations in simple simulations #227

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May 14, 2024
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Test allocations in simple simulations #227

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32 changes: 31 additions & 1 deletion test/simulation.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -782,4 +782,34 @@ end
sim_Tracer = evalsim(Tracer)
@test sim_Tracer(d_rect, generate, DiagonalHodge()) isa Any

end
end

@testset "Allocations" begin
# Test the heat equation Decapode has expected memory allocation.
Heat = @decapode begin
C::Form0
D::Constant
∂ₜ(C) == D*Δ(C)
end
sim = eval(gensim(Heat))
s = loadmesh(Icosphere(1))
sd = EmbeddedDeltaDualComplex2D{Bool,Float64,Point3D}(s)
subdivide_duals!(sd, Circumcenter())
f = sim(sd,nothing)
u₀ = ComponentArray(
C = map(x -> x[3], point(sd)))
p = (D=1e-1,)
du = copy(u₀)
# The first call to the function makes many allocations.
_ = @allocations f(du, u₀, p, (0,1.0)) # 55259
_ = @allocated f(du, u₀, p, (0,1.0)) # 3962696
# Test that subsequent calls make a reasonable amount.
bytes = @allocated f(du, u₀, p, (0,1.0))
nallocs = @allocations f(du, u₀, p, (0,1.0))
@test nallocs == 4
@test bytes ==
sizeof(u₀.C) +
sizeof(p.D) +
sizeof(Decapodes.FixedSizeDiffCache(Vector{Float64}(undef , nparts(sd, :V))))
end

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