Merge pull request #103 from JuliaGPU/tb/compile

Make the compilation example first-class functionality.

Author: SimonDanisch

examples/compilation/README.md

@@ -0,0 +1,30 @@
+using CUDAdrv, CUDArt
+using Base.Test
+
+using Compat
+
+dev = CuDevice(0)
+ctx = CuContext(dev)
+
+CUDArt.@compile dev kernel_vadd """
+    __global__ void kernel_vadd(const float *a, const float *b, float *c)
+    {
+        int i = blockIdx.x *blockDim.x + threadIdx.x;
+        c[i] = a[i] + b[i];
+    }
+"""
+
+dims = (3,4)
+a = round.(rand(Float32, dims) * 100)
+b = round.(rand(Float32, dims) * 100)
+
+d_a = CuArray(a)
+d_b = CuArray(b)
+d_c = similar(d_a)
+
+len = prod(dims)
+cudacall(kernel_vadd, len, 1, Tuple{Ptr{Cfloat},Ptr{Cfloat},Ptr{Cfloat}}, d_a, d_b, d_c)
+c = Array(d_c)
+@test a+b ≈ c
+
+destroy!(ctx)

examples/compilation/usage.jl

@@ -46,6 +46,7 @@ include("device.jl")
 include("stream.jl")
 include("pointer.jl")
 include("arrays.jl")
+include("compile.jl")
 include("execute.jl")
 
 include("precompile.jl")

examples/vadd.jl

@@ -1,7 +1,4 @@
-# EXCLUDE FROM TESTING
-
-using CUDArt
-using Compat
+export CompileError
 
 # Generate a temporary file with specific suffix
 # NOTE: mkstemps is glibc 2.19+, so emulate its behavior
@@ -28,9 +25,8 @@ macro compile(dev, kernel, code)
         :($(esc(kernel)) = _compile($(esc(dev)), $kernel_name, $code, $containing_file)))
 end
 
-type CompileError <: Base.WrappedException
+immutable CompileError <: Exception
     message::String
-    error
 end
 
 const builddir = joinpath(@__DIR__, ".cache")
@@ -43,7 +39,7 @@ function _compile(dev, kernel, code, containing_file)
         mkpath(builddir)
     end
 
-    # Check if we need to compile
+    # check if we need to compile
     codehash = hex(hash(code))
     output = "$builddir/$(kernel)_$(codehash)-$(arch).ptx"
     if isfile(output)
@@ -52,51 +48,44 @@ function _compile(dev, kernel, code, containing_file)
         need_compile = true
     end
 
-    # Compile the source, if necessary
+    # compile the source, if necessary
     if need_compile
-        # Write the source into a compilable file
+        # write the source to a compilable file
         (source, io) = mkstemps(".cu")
         write(io, """
 extern "C"
 {
 $code
 }
 """)
-        close(io)
+        Base.close(io)
 
         compile_flags = vcat(CUDArt.toolchain_flags, ["--gpu-architecture", arch])
-        try
-            # TODO: capture STDERR
-            run(pipeline(`$(CUDArt.toolchain_nvcc) $(compile_flags) -ptx -o $output $source`, stderr=DevNull))
-        catch ex
-            isa(ex, ErrorException) || rethrow(ex)
-            rethrow(CompileError("compilation of kernel $kernel failed (typo in C++ source?)", ex))
-        finally
-            rm(source)
+        err = Pipe()
+        cmd = `$(CUDArt.toolchain_nvcc) $(compile_flags) -ptx -o $output $source`
+        result = success(pipeline(cmd; stdout=DevNull, stderr=err))
+        Base.close(err.in)
+        rm(source)
+
+        errors = readstring(err)
+        if !result
+            throw(CompileError("compilation of kernel $kernel failed\n$errors"))
+        elseif !isempty(errors)
+            warn("during compilation of kernel $kernel:\n$errors")
         end
 
         if !isfile(output)
             error("compilation of kernel $kernel failed (no output generated)")
         end
     end
 
-    # Pass the module to the CUDA driver
-    mod = try
-        CuModuleFile(output)
-    catch ex
-        rethrow(CompileError("loading of kernel $kernel failed (invalid CUDA code?)", ex))
-    end
-
-    # Load the function pointer
-    func = try
-        CuFunction(mod, kernel)
-    catch ex
-        rethrow(CompileError("could not find kernel $kernel in the compiled binary (wrong function name?)", ex))
-    end
-
-    return func
+    mod = CUDAdrv.CuModuleFile(output)
+    return CUDAdrv.CuFunction(mod, kernel)
 end
 
 function clean_cache()
-    rm(builddir; recursive=true)
+    if ispath(builddir)
+        @assert isdir(builddir)
+        rm(builddir; recursive=true)
+    end
 end

src/CUDArt.jl

@@ -0,0 +1,69 @@
+using CUDArt
+import CUDAdrv
+using Base.Test
+
+dev = CUDAdrv.CuDevice(0)
+ctx = CUDAdrv.CuContext(dev)
+
+CUDArt.clean_cache()   # for deterministic testing purposes
+
+
+## basic compilation & execution
+
+let
+    CUDArt.@compile dev kernel """
+    __global__ void kernel()
+    {
+    }
+    """
+
+    CUDAdrv.cudacall(kernel, 1, 1, ())
+end
+
+@test_throws CompileError let
+    CUDArt.@compile dev kernel """
+    __global__ void kernel()
+    {
+        invalid code
+    }
+    """
+end
+
+@test_throws CUDAdrv.CuError let
+    CUDArt.@compile dev wrongname """
+    __global__ void kernel()
+    {
+    }
+    """
+end
+
+
+## argument passing
+
+dims = (16, 16)
+len = prod(dims)
+
+CUDArt.@compile dev kernel_copy """
+__global__ void kernel_copy(const float *input, float *output)
+{
+    int i = blockIdx.x * blockDim.x + threadIdx.x;
+
+    output[i] = input[i];
+}
+"""
+
+let
+    input = round.(rand(Cfloat, dims) * 100)
+
+    input_dev = CUDAdrv.CuArray(input)
+    output_dev = CUDAdrv.CuArray{Cfloat}(dims)
+
+    CUDAdrv.cudacall(kernel_copy, 1, len,
+                     Tuple{Ptr{Cfloat}, Ptr{Cfloat}},
+                     input_dev, output_dev)
+    output = Array(output_dev)
+    @test input ≈ output
+end
+
+
+CUDAdrv.destroy!(ctx)

examples/compilation/library.jl renamed to src/compile.jl

@@ -1,3 +1,4 @@
 include("gc.jl")
 include("test.jl")
+include("compile.jl")
 include("examples.jl")