Function svds freezes

[lostella]

I'm experiencing a problem with svds in Julia 0.6.0-dev.2439, commit 953029f, on macOS. What happens is that the REPL freezes after invoking svds, as in

x = randn(10,10)
out = svds(x, nsv=3)

After cmd+c'ing and re-issuing the latter command, the output is produced correctly.

versioninfo() gives:

Julia Version 0.6.0-dev.2439
Commit 953029f (2017-01-28 07:23 UTC)
Platform Info:
  OS: macOS (x86_64-apple-darwin13.4.0)
  CPU: Intel(R) Core(TM) i5-5257U CPU @ 2.70GHz
  WORD_SIZE: 64
  BLAS: libopenblas (USE64BITINT DYNAMIC_ARCH NO_AFFINITY Haswell)
  LAPACK: libopenblas64_
  LIBM: libopenlibm
  LLVM: libLLVM-3.9.1 (ORCJIT, broadwell)

[andreasnoack]

Confirmed. Inference appears to hang in an infinite loop. Probably caused by JuliaLang/julia#18457.

[RalphAS]

On Linux x86_64 it's not an infinite loop - it just takes 100 seconds or so (compared to about 3 seconds in 0.5.0). Profiling points to deeply nested inference code, with the bulk of the time in jl_matching_methods() and underlying C code.

Interestingly, there is no such delay for eigs with dense or sparse array arguments, just for the type used by svds.

[tkelman]

It looks like this may have been fixed by JuliaLang/julia#20354 ?

(on my system I see master about 50% slower than 0.5)

[simonbyrne]

It seems to be a bit better: the first call to svds now takes 7 seconds on my machine (it takes 5 secs on 0.5)

[andreasnoack]

Fixed by 93a725d51dde9bc5731e08fd50085108e3d43f3c