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julia> using LinearAlgebra
julia> peakflops(; parallel=true)
ERROR: MethodError: no method matching nworkers()
The applicable method may be too new: running in world age 25267, while current world is 25269.
Closest candidates are:
nworkers(::Distributed.WorkerPool) (method too new to be called from this world context.)
@ Distributed ~/repo/julia/usr/share/julia/stdlib/v1.11/Distributed/src/workerpool.jl:139
nworkers() (method too new to be called from this world context.)
@ Distributed ~/repo/julia/usr/share/julia/stdlib/v1.11/Distributed/src/cluster.jl:900
nworkers(::Distributed.AbstractWorkerPool) (method too new to be called from this world context.)
@ Distributed ~/repo/julia/usr/share/julia/stdlib/v1.11/Distributed/src/workerpool.jl:148
Stacktrace:
[1] peakflops(n::Int64; eltype::DataType, ntrials::Int64, parallel::Bool)
@ LinearAlgebra ~/repo/julia/usr/share/julia/stdlib/v1.11/LinearAlgebra/src/LinearAlgebra.jl:622
[2] peakflops(n::Int64; eltype::DataType, ntrials::Int64, parallel::Bool)
@ InteractiveUtils ~/repo/julia/usr/share/julia/stdlib/v1.11/InteractiveUtils/src/InteractiveUtils.jl:335
[3] peakflops
@ InteractiveUtils ~/repo/julia/usr/share/julia/stdlib/v1.11/InteractiveUtils/src/InteractiveUtils.jl:330 [inlined]
[4] top-level scope
@ REPL[2]:1
julia> versioninfo()
Julia Version 1.11.0-DEV.632
Commit 1abafe85b2c* (2023-10-11 07:57 UTC)
Platform Info:
OS: Linux (x86_64-pc-linux-gnu)
CPU: 8 × Intel(R) Core(TM) i7-4870HQ CPU @ 2.50GHz
WORD_SIZE: 64
LLVM: libLLVM-15.0.7 (ORCJIT, haswell)
Threads: 1 on 8 virtual cores
Explicitly loading Distributed
does the trick:
julia> using Distributed
julia> peakflops(; parallel=true)
1.4242260084820227e11
but that's not documented to be required:
help?> peakflops
search: peakflops
peakflops(n::Integer=4096; eltype::DataType=Float64, ntrials::Integer=3, parallel::Bool=false)
peakflops computes the peak flop rate of the computer by using double precision gemm!. For more information see LinearAlgebra.peakflops.
│ Julia 1.1
│
│ This function will be moved from InteractiveUtils to LinearAlgebra in the future. In Julia 1.1 and later it is available as LinearAlgebra.peakflops.
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