I would like to call Symmetric() inside an @everywhere function, and use pmap to generate an array of Symmetric matrices, which are half of the sizeof normal ones, but I received an UndefVarError.
using LinearAlgebra, Distributed
addprocs(Sys.CPU_THREADS - 1)
@everywhere function G_parallel(d)
return Symmetric([i == j ? randn()/d : randn()/(2*d) for i in 1:d, j in 1:d])
end
pmap( _ -> G_parallel(2), 1:10000)
Here’s the error received.
On worker 4:
UndefVarError: Symmetric not defined
G_parallel at ./In[5]:2
#9 at ./In[6]:1
#112 at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.1/Distributed/src/process_messages.jl:269
run_work_thunk at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.1/Distributed/src/process_messages.jl:56
macro expansion at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.1/Distributed/src/process_messages.jl:269 [inlined]
#111 at ./task.jl:259
Stacktrace:
[1] (::getfield(Base, Symbol("##696#698")))(::Task) at ./asyncmap.jl:178
[2] foreach(::getfield(Base, Symbol("##696#698")), ::Array{Any,1}) at ./abstractarray.jl:1866
[3] maptwice(::Function, ::Channel{Any}, ::Array{Any,1}, ::UnitRange{Int64}) at ./asyncmap.jl:178
[4] #async_usemap#681 at ./asyncmap.jl:154 [inlined]
[5] #async_usemap at ./none:0 [inlined]
[6] #asyncmap#680 at ./asyncmap.jl:81 [inlined]
[7] #asyncmap at ./none:0 [inlined]
[8] #pmap#213(::Bool, ::Int64, ::Nothing, ::Array{Any,1}, ::Nothing, ::Function, ::Function, ::WorkerPool, ::UnitRange{Int64}) at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.1/Distributed/src/pmap.jl:126
[9] pmap(::Function, ::WorkerPool, ::UnitRange{Int64}) at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.1/Distributed/src/pmap.jl:101
[10] #pmap#223(::Base.Iterators.Pairs{Union{},Union{},Tuple{},NamedTuple{(),Tuple{}}}, ::Function, ::Function, ::UnitRange{Int64}) at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.1/Distributed/src/pmap.jl:156
[11] pmap(::Function, ::UnitRange{Int64}) at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.1/Distributed/src/pmap.jl:156
[12] top-level scope at In[6]:1