Profiling doesn't work at all on OS X

[newhouseb]

If I run the following from the documentation here: http://julia.readthedocs.org/en/latest/stdlib/profile/

julia> function myfunc()
           A = rand(100, 100, 200)
           max(A)
       end
myfunc (generic function with 1 method)

julia> myfunc()
WARNING: max(x) is deprecated, use maximum(x) instead.
0.9999994755239174

julia> @profile myfunc()
WARNING: max(x) is deprecated, use maximum(x) instead.
0.9999998409036248

julia> Profile.print()

julia>

This may be related to: #3469, as I never get any backtraces either.

I'm running Version 0.3.0-prerelease+2156 (2014-03-24 16:53 UTC), Commit c81664a* (2 days old master), x86_64-apple-darwin13.0.0. Installed through homebrew.

Happy to explore, debug, but I'm relatively new to Julia so would need some pointers on where to poke around.

[rened]

I tried to reproduce this, but on the current master, as well as on c81664a and a 24 days old build this works. In all cases julia was installed manually though, on 10.9.2.

  | | | | | | |/ _` |  |
  | | |_| | | | (_| |  |  Version 0.3.0-prerelease+2177 (2014-03-27 01:39 UTC)
 _/ |\__'_|_|_|\__'_|  |  Commit 7d475bf* (0 days old master)
|__/                   |  x86_64-apple-darwin13.1.0

julia> function myfunc()
                  A = rand(100, 100, 200)
                  max(A)
              end
myfunc (generic function with 1 method)

julia> myfunc()
WARNING: max(x) is deprecated, use maximum(x) instead.
 in max at deprecated.jl:26
 in myfunc at none:3
0.999999615846902

julia> @profile myfunc()
0.9999998838460968

julia> Profile.print()
           17 profile.jl; anonymous; line: 14
            12 none; myfunc; line: 2
             12 librandom.jl; dsfmt_gv_fill_array_close_open!; line: 129
            5  none; myfunc; line: 3
             2 deprecated.jl; max; line: 26
                 1 util.jl; warn; line: 508
                    1 set.jl; in; line: 16
                     1 dict.jl; ht_keyindex; line: 451
             3 deprecated.jl; max; line: 28
              1 reduce.jl; maximum_rgn; line: 396
              2 reduce.jl; maximum_rgn; line: 397

perhaps @staticfloat can comment on what might be different in the homebrew builds?

[staticfloat]

I can confirm that this happens in the Homebrew build. I'll try to take a look at this soon.

[staticfloat]

@timholy Do you have any idea why this might be happening? It looks to me like the profile data structures are just never getting filled.

[timholy]

@newhouseb, am I right in understanding that you don't get backtraces from any errors? #3469 is deeply annoying but relatively infrequent, and tends to happen only for functions that are inlined. If a function like

function myfunc()
    b = true
    if b
        error("1")
    else
        error("0")
    end
end

does not give you a backtrace, then (1) it's not #3469, and (2) it's not profiler-specific. Instead there's something broken in your backtraces. The profiler simply co-opts that infrastructure for its own purposes.

[timholy]

(Welcome back @staticfloat! We missed you while you were gone 😄)

[newhouseb]

Yes, running your sample above, @timholy, I get:

julia> myfunc()
ERROR: 1

If it's not working through homebrew would it be unreasonable to assume that some compiler setting/flag is doing strange things and therefore I might be able to narrow down the problem by compiling from source? I'll go ahead and try that anyway in a bit.

[staticfloat]

@newhouseb I can confirm that compiling from source works and compiling through Homebrew doesn't. Unfortunately, there's a lot of configuration done in the Homebrew formula, so narrowing down exactly what's changing this could be difficult. I'm betting it has something to do with libunwind though.

[Keno]

Are you using libosxunwind?

[dpo]

Having the same issue on 10.8.5 (clang 425), built with Homebrew. Julia 0.3.0-prerelease+2690 (2014-04-20 12:15 UTC).

[staticfloat]

I'm assigning myself so that I don't lose track of this.

[randy3k]

I have the same problem, also built with homebrew...