# svdvals is alarmingly slow

**URL:** <https://discourse.julialang.org/t/svdvals-is-alarmingly-slow/9259>\
**Category:** Performance\
**Created:** [February 22, 2018, 6:29pm UTC](https://discourse.julialang.org/t/svdvals-is-alarmingly-slow/9259 "2018-02-22T18:29:33Z")\
**Posts on this page:** 1\
**Showing post:** 21

<div class="post-metadata">

**Author:** ![mbaz](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/mbaz/32/17295_2.png) [@mbaz](https://discourse.julialang.org/u/mbaz)\
**Post date:** [February 23, 2018, 11:13pm UTC](https://discourse.julialang.org/t/svdvals-is-alarmingly-slow/9259/21 "2018-02-23T23:13:13Z")

</div>

@simonbyrne I had a chance to try it, and the results are not good:

```julia
julia> @btime svdvals($B);
  1.371 ms (11 allocations: 138.20 KiB)

julia> versioninfo()
Julia Version 0.6.2
Commit d386e40c17* (2017-12-13 18:08 UTC)
Platform Info:
  OS: Windows (x86_64-w64-mingw32)
  CPU: Intel(R) Core(TM) i7-7820HQ CPU @ 2.90GHz
  WORD_SIZE: 64
  BLAS: libopenblas (USE64BITINT DYNAMIC_ARCH NO_AFFINITY Prescott)
  LAPACK: libopenblas64_
  LIBM: libopenlibm
  LLVM: libLLVM-3.9.1 (ORCJIT, broadwell)

```

This is the same machine where Julia on a Linux VirtualBox takes 673us.

One more thing, on Linux I build Julia from source, while on Windows I’m using the precompiled binary. I don’t expect this to cause much difference (but you never know).

---

_[View the full topic](https://discourse.julialang.org/t/svdvals-is-alarmingly-slow/9259)._