Don't understand why code runs out of memory and crashes

General Usage
,
22

There is a function task_local_storage() which gives you an IdDict which is local to your task. It can be used to store a vector under some name, e.g. with

v = get!(() -> Vector{Float64}(), task_local_storage(), :myvec)::Vector{Float64}
resize!(v, N)

Here’s a macro which automates away the uglyness, and creates a unique name for the vector:

macro tlscache(type)
    sym = Expr(:quote, gensym("tls"))
    quote
        get!(() -> $(esc(type))(), Base.task_local_storage(), ($sym,$(esc(type))))::$(esc(type))
    end
end

Use as:

x = @tlscache Vector{Float64}
resize!(x, N)
randn!(x)
sort!(x)

By using resize!, the vector is only reallocated if the size N is larger then before. If N is always the same, you allocate only the first time, and you get one vector per task.

2 Likes