JuliaArrays / JuliaArrays/StaticArrays.jl
`mapreduce`/`mapfoldl` unrolls fully, failing to compile for large static sizes
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- Dominant language
- Julia
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- 159
- Avg merge
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- Merged PRs (30d)
- 3
Description
MWE:
julia> x = SizedVector{30000}(randn(30000));
julia> 0.5 in x
ERROR: syntax: invalid syntax (memory-error out of gc handles)
Stacktrace:
[1] top-level scope
@ REPL[4]:1
[2] _mapreduce
@ ~/.julia/packages/StaticArrays/58yy1/src/mapreduce.jl:113 [inlined]
[3] in(x::Float64, a::SizedVector{30000, Float64, Vector{Float64}})
@ StaticArrays ~/.julia/packages/StaticArrays/58yy1/src/mapreduce.jl:267
[4] top-level scope
@ REPL[4]:1
[5] top-level scope
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- Read the whole issue, then the project's contributing guide.
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Research direction
Reproduce the MWE and inspect StaticArrays/mapreduce.jl, especially _mapreduce around line 113 and in around line 267. Determine how mapreduce and mapfoldl are fully unrolled for large static sizes; done means large inputs such as SizedVector{30000} compile without the memory-error while preserving the operation's behavior.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- julia
- Domain
- performance
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100