readdlm speed regression

[alexmorley]

yes 1234567 | head -1000000 > test.txt
julia -e "versioninfo()"
julia test.jl
juliav7 -e "versioninfo()"
juliav7 test.jl

Gives

julia version 0.6.0
0.823502 seconds (286.43 k allocations: 31.633 MiB)
1.165942 seconds (3.09 M allocations: 104.117 MiB, 48.31% gc time)
julia version 0.7.0
6.022019 seconds (34.26 M allocations: 859.682 MiB, 4.85% gc time)
5.411997 seconds (35.93 M allocations: 875.413 MiB, 4.22% gc time)

where test.jl is

if VERSION >= v"0.7.0"
    using DelimitedFiles
end
@time readdlm("test.txt",' ', Int, '\n',dims=(1000000,1))
@time readdlm("test.txt")

Version Information Below:

Julia Version 0.6.0
Commit 9036443 (2017-06-19 13:05 UTC)
Platform Info:
OS: Linux (x86_64-pc-linux-gnu)
CPU: Intel(R) Xeon(R) CPU E7-8860 v4 @ 2.20GHz
WORD_SIZE: 64
BLAS: libopenblas (USE64BITINT DYNAMIC_ARCH NO_AFFINITY Haswell)
LAPACK: libopenblas64_
LIBM: libopenlibm
LLVM: libLLVM-3.9.1 (ORCJIT, broadwell)

Julia Version 0.7.0
Commit a4cb80f (2018-08-08 06:46 UTC)
Platform Info:
OS: Linux (x86_64-pc-linux-gnu)
CPU: Intel(R) Xeon(R) CPU E7-8860 v4 @ 2.20GHz
WORD_SIZE: 64
LIBM: libopenlibm
LLVM: libLLVM-6.0.0 (ORCJIT, broadwell)

[JeffBezanson]

Duplicate of #29036?

[alexmorley]

Yes, probably! Sorry not sure I didn't hit that on my search. Thanks.