readdlm() doesn't properly close file when file opened with a string

[dahlend]

A = readdlm("./data.csv")

This will read the file data.csv properly, however it doesn't close the file upon completion.

file_location = file("./data.csv")
A = readdlm(file_location)
close(file_location)

works fine, however I wasn't sure if in the first case was a bug or just poor programming on my part.

[staticfloat]

Can you post your versioninfo() so that we can see your OS version, your Julia version, etc...

[jakebolewski]

Are you using Windows?

[dahlend]

On a mac, versioninfo() gives, I am reading and writing to a NFS Drive...

Julia Version 0.3.0
Commit 7681878* (2014-08-20 20:43 UTC)

Platform Info:
System: Darwin (x86_64-apple-darwin13.3.0)
CPU: Intel(R) Core(TM) i5-4278U CPU @ 2.60GHz
WORD_SIZE: 64
BLAS: libopenblas (USE64BITINT DYNAMIC_ARCH NO_AFFINITY Haswell)
LAPACK: libopenblas
LIBM: libopenlibm
LLVM: libLLVM-3.3

[JeffBezanson]

Also #4664, but there we did something windows-specific since the consequences are worse there.

[ViralBShah]

It seems that this is fixed.

[JeffBezanson]

I think when we use mmap the file isn't closed until the next GC.

[StefanKarpinski]

http://stackoverflow.com/questions/34394361/julia-limit-on-the-number-of-files-open-while-using-readdlm

[felipenoris]

Just ran into this today. Your OS is not windows, but I think mmap + NFS causes this.

Use this and it should work.

A = readdlm("./data.csv"; use_mmap=false)

#7007 did put a default use_mmap=false on windows, but this looks like a file-system specific problem. Should we add a comment on the help of readdlm function?

[felipenoris]

... or even put use_mmap=false for every system.