readdlm problem when reading many files

[cmmp]

I'm getting a strange error when using readdlm over many files.

Consider a simple write code:

for i in 1:300
    writedlm("$i.dat", rand(10))
end

and the read code:

for i in 1:300
    x = readdlm("$i.dat")
end

The write code runs fine, but when trying to run the read code I get:

ERROR: could not open file 244.dat
 in open at io.jl:291
 in open at io.jl:301
 in readdlm_auto at datafmt.jl:46
 in readdlm at datafmt.jl:41
 in readdlm at datafmt.jl:38
 in anonymous at no file:2
 in include_from_node1 at loading.jl:92
 in process_options at client.jl:274
 in _start at client.jl:352
at /Users/cassio/Desktop/test/read.jl:3

However, if I try to open it in the REPL there's no problem:

Cassios-iMac:test cassio$ julia
               _
   _       _ _(_)_     |  A fresh approach to technical computing
  (_)     | (_) (_)    |  Documentation: http://docs.julialang.org
   _ _   _| |_  __ _   |  Type "help()" to list help topics
  | | | | | | |/ _` |  |
  | | |_| | | | (_| |  |  Version 0.2.0-prerelease+2890
 _/ |\__'_|_|_|\__'_|  |  Commit master/9c392b7* 2013-07-30 14:51:08 UTC
|__/                   |  x86_64-apple-darwin12.4.0

julia> x = readdlm("244.dat")
10x1 Float64 Array:
 0.485284
 0.249354
 0.305629
 0.412677
 0.740868
 0.574576
 0.23548
 0.0276011
 0.963765
 0.297823

I'm running OS X 10.8.4 with julia: master/9c392b7*

Any ideas?

Thanks,
Cássio

[tanmaykm]

I think it's because of the file handle opened for mmap is not closed and you are running out of file handles. This would happen in tight loops where gc does not get an opportunity to run.

I shall push a fix shortly.