Unhandled task failure on v0.5

[protogeezer]

I have a 5K retina iMac with OpenCL.Device(AMD Radeon R9 M295X Compute Engine on Apple @0x0000000001021c00). I've started getting errors when I build kernels:

ERROR (unhandled task failure): OpenCL Error: OpenCL.Context error: ȧJ?
in raise_context_error(::String, ::String) at /Users/sjbespa/.julia/v0.5/OpenCL/src/context.jl:56
in macro expansion at /Users/sjbespa/.julia/v0.5/OpenCL/src/context.jl:97 [inlined]
in (::OpenCL.##45#48)() at ./task.jl:309

Running Pkg.test("OpenCL") results in about 1/2 dozen of the errors... with julia updated this morning.

[vchuravy]

Thanks for the report, could you try the branch #109? The PR is still WIP, but master does not support v0.5 at the moment.

[protogeezer]

Fair enough. How do I select the vc/refactor branch? I tried doing a git checkout followed by a Pkg.build("OpenCL") but after that usual functions such as OpenCL.devices and create_some_context are missing.. or at least undefined.

[vchuravy]

hm Pkg.checkout("OpenCL", "vc/refactor") should be enough.

On Thu, 28 Jul 2016 at 04:45 protogeezer [email protected] wrote:

Fair enough. How do I select the vc/refactor branch? I tried doing a git
checkout followed by a Pkg.build("OpenCL") but after that usual functions
such as OpenCL.devices and create_some_context are missing.. or at least
undefined.

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[protogeezer]

After the checkout functions like OpenCL.devices(), OpenCL.platforms(), and OpenCL.create_some_context() are still undefined.

[vchuravy]

Oh sorry I misread your comment.

On the refactored branch you will have to do

using OpenCL
cl.devices()

[protogeezer]

Thanks!
I’ll try it out.

On Aug 5, 2016, at 8:51 AM, Valentin Churavy [email protected] wrote:

Oh sorry I misread your comment.

On the refactored branch you will have to do

using OpenCL
cl.devices()

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[protogeezer]

Adding a small error to the examples/demo.jl (see below) results in different crashes depending on whether the problem is a warning or an error. For the version with an error:

sjbespa$ julia
               _
   _       _ _(_)_     |  A fresh approach to technical computing
  (_)     | (_) (_)    |  Documentation: http://docs.julialang.org
   _ _   _| |_  __ _   |  Type "?help" for help.
  | | | | | | |/ _` |  |
  | | |_| | | | (_| |  |  Version 0.5.0-rc0+22 (2016-07-27 15:49 UTC)
 _/ |\__'_|_|_|\__'_|  |  Commit e474dd4 (9 days old master)
|__/                   |  x86_64-apple-darwin15.6.0

julia> include("demo.jl")

WARNING: deprecated syntax "flags::CL_mem_flags".
Use "local flags::CL_mem_flags" instead.
ERROR: LoadError: CLError(code=-11, CL_BUILD_PROGRAM_FAILURE)
 in macro expansion at /Users/sjbespa/.julia/v0.5/OpenCL/src/macros.jl:6 [inlined]
 in #build!#117(::String, ::Bool, ::Function, ::OpenCL.cl.Program) at /Users/sjbespa/.julia/v0.5/OpenCL/src/program.jl:84
 in |>(::OpenCL.cl.Program, ::OpenCL.cl.#build!) at ./operators.jl:335
 in include_from_node1(::String) at ./loading.jl:426
while loading /Users/sjbespa/ranking-code/demo.jl, in expression starting on line 27WARNING: String(p::Union{Ptr{Int8},Ptr{UInt8}}) is deprecated, use unsafe_string(p) instead.


julia> ::String, ::Symbol) at ./deprecated.jl:64
 in String(::Ptr{Int8}) at ./deprecated.jl:50
 in macro expansion at /Users/sjbespa/.julia/v0.5/OpenCL/src/context.jl:94 [inlined]
 in (::OpenCL.cl.##44#46)() at ./task.jl:309
while loading no file, in expression starting on line 0
ERROR (unhandled task failure): MethodError: no method matching unsafe_string(::Ptr{Void})
Closest candidates are:
  unsafe_string(::Cstring) at c.jl:187
  unsafe_string(::Union{Ptr{Int8},Ptr{UInt8}}) at strings/basic.jl:56
  unsafe_string(::Union{Ptr{Int8},Ptr{UInt8}}, ::Integer) at strings/basic.jl:52
 in macro expansion at /Users/sjbespa/.julia/v0.5/OpenCL/src/context.jl:95 [inlined]
 in (::OpenCL.cl.##44#46)() at ./task.jl:309

using OpenCL
if VERSION < v"0.4.9"
    const cl = OpenCL
end
const sum_kernel_src = "
   __kernel void sum(__global const float *a,
                     __global const float *b,
                     __global float *c)
    {
      int gid = get_global_id(0);
      float d; // or c for an error not a warning
      c[gid] = a[gid] + b[gid];
    }
"
a = rand(Float32, 50_000)
b = rand(Float32, 50_000)

device, ctx, queue = cl.create_compute_context()

# create opencl buffer objects
# copies to the device initiated when the kernel function is called
a_buff = cl.Buffer(Float32, ctx, (:r, :copy), hostbuf=a)
b_buff = cl.Buffer(Float32, ctx, (:r, :copy), hostbuf=b)
c_buff = cl.Buffer(Float32, ctx, :w, length(a))

# build the program and construct a kernel object
p = cl.Program(ctx, source=sum_kernel_src) |> cl.build!
sum_kernel = cl.Kernel(p, "sum")

# call the kernel object with global size set to the size our arrays
sum_kernel[queue, size(a)](a_buff, b_buff, c_buff)

# perform a blocking read of the result from the device
r = cl.read(queue, c_buff)

# check to see if our result is what we expect!
if isapprox(norm(r - (a+b)), zero(Float32))
    info("Success!")
else
    error("Norm should be 0.0f")
end

[ericproffitt]

I'm also getting this error:

ERROR (unhandled task failure): MethodError: no method matching unsafe_string(::Ptr{Void})

However strangely enough the error does not cause the algorithm to abort.

[juliohm]

We are trying to revive the OpenCL.jl package. This issue is too old to be addressed in recent Julia versions. Closing it.