Debugging Utilities

findallocs(x)

Utility function that can be used to track down allocations in LazyExpressions.

Examples

The following session shows the output of findallocs if the expression doesn't allocate:

julia> x = [Variable(model) for i in 1 : 2];

julia> param = Parameter{Int}(() -> 2, model)
Parameter{Int64, …}(…)

julia> expr = @expression param * x
LazyExpression{FunctionWrapper{…}(LazyExpression{typeof(Parametron.Functions.scale!), …}(…))}(…)

julia> Parametron.findallocs(expr)
LazyExpression{FunctionWrapper{…}(LazyExpression{typeof(Parametron.Functions.scale!), …}(…))}(…): 0 bytes
  [1]: Array{LinearTerm{Int64},1}
  [2]: Parameter{Int64, …}(…): 0 bytes
  [3]: Array{Variable,1}

In this session, param allocates, and findallocs reports the allocation:

julia> x = [Variable(model) for i in 1 : 2];

julia> param = Parameter(() -> zeros(2), model)
Parameter{Array{Float64,1}, …}(…)

julia> expr = @expression param ⋅ x
LazyExpression{FunctionWrapper{…}(LazyExpression{typeof(Parametron.Functions.vecdot!), …}(…))}(…)

julia> Parametron.findallocs(expr)
LazyExpression{FunctionWrapper{…}(LazyExpression{typeof(Parametron.Functions.vecdot!), …}(…))}(…): 0 bytes
  [1]: AffineFunction{Float64}
  [2]: Parameter{Array{Float64,1}, …}(…): 96 bytes
  [3]: Array{Variable,1}