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execution.jl
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execution.jl
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import Adapt
dummy() = return
@testset "@cuda" begin
@test_throws UndefVarError @cuda undefined()
@test_throws MethodError @cuda dummy(1)
@testset "low-level interface" begin
k = cufunction(dummy)
k()
k(; threads=1)
CUDA.version(k)
CUDA.memory(k)
CUDA.registers(k)
CUDA.maxthreads(k)
end
@testset "launch configuration" begin
@cuda dummy()
@cuda threads=1 dummy()
@cuda threads=(1,1) dummy()
@cuda threads=(1,1,1) dummy()
@cuda blocks=1 dummy()
@cuda blocks=(1,1) dummy()
@cuda blocks=(1,1,1) dummy()
@cuda config=(kernel)->() dummy()
@cuda config=(kernel)->(threads=1,) dummy()
@cuda config=(kernel)->(blocks=1,) dummy()
@cuda config=(kernel)->(shmem=0,) dummy()
end
@testset "compilation params" begin
@cuda dummy()
memcheck || @test_throws CuError @cuda threads=2 maxthreads=1 dummy()
@cuda threads=2 dummy()
end
@testset "reflection" begin
CUDA.code_lowered(dummy, Tuple{})
CUDA.code_typed(dummy, Tuple{})
CUDA.code_warntype(devnull, dummy, Tuple{})
CUDA.code_llvm(devnull, dummy, Tuple{})
CUDA.code_ptx(devnull, dummy, Tuple{})
memcheck || CUDA.code_sass(devnull, dummy, Tuple{})
@device_code_lowered @cuda dummy()
@device_code_typed @cuda dummy()
@device_code_warntype io=devnull @cuda dummy()
@device_code_llvm io=devnull @cuda dummy()
@device_code_ptx io=devnull @cuda dummy()
memcheck || @device_code_sass io=devnull @cuda dummy()
mktempdir() do dir
@device_code dir=dir @cuda dummy()
end
@test_throws ErrorException @device_code_lowered nothing
# make sure kernel name aliases are preserved in the generated code
@test occursin("julia_dummy", sprint(io->(@device_code_llvm io=io optimize=false @cuda dummy())))
@test occursin("julia_dummy", sprint(io->(@device_code_llvm io=io @cuda dummy())))
@test occursin("julia_dummy", sprint(io->(@device_code_ptx io=io @cuda dummy())))
memcheck || @test occursin("julia_dummy", sprint(io->(@device_code_sass io=io @cuda dummy())))
# make sure invalid kernels can be partially reflected upon
let
invalid_kernel() = throw()
@test_throws CUDA.KernelError @cuda invalid_kernel()
@test_throws CUDA.KernelError @grab_output @device_code_warntype @cuda invalid_kernel()
out, err = @grab_output begin
try
@device_code_warntype @cuda invalid_kernel()
catch
end
end
@test occursin("Body::Union{}", err)
end
let
range_kernel() = (0.0:0.1:100.0; nothing)
@test_throws CUDA.InvalidIRError @cuda range_kernel()
end
# set name of kernel
@test occursin("julia_mykernel", sprint(io->(@device_code_llvm io=io begin
k = cufunction(dummy, name="mykernel")
k()
end)))
end
@testset "shared memory" begin
@cuda shmem=1 dummy()
end
@testset "streams" begin
s = CuStream()
@cuda stream=s dummy()
end
@testset "external kernels" begin
@eval module KernelModule
export external_dummy
external_dummy() = return
end
import ...KernelModule
@cuda KernelModule.external_dummy()
@eval begin
using ...KernelModule
@cuda external_dummy()
end
@eval module WrapperModule
using CUDA
@eval dummy() = return
wrapper() = @cuda dummy()
end
WrapperModule.wrapper()
end
@testset "calling device function" begin
@noinline child(i) = sink(i)
function parent()
child(1)
return
end
@cuda parent()
end
@testset "varargs" begin
function kernel(args...)
@cuprint(args[2])
return
end
_, out = @grab_output begin
@cuda kernel(1, 2, 3)
synchronize()
end
@test out == "2"
end
end
############################################################################################
@testset "argument passing" begin
dims = (16, 16)
len = prod(dims)
@testset "manually allocated" begin
function kernel(input, output)
i = (blockIdx().x-1) * blockDim().x + threadIdx().x
val = input[i]
output[i] = val
return
end
input = round.(rand(Float32, dims) * 100)
output = similar(input)
input_dev = CuArray(input)
output_dev = CuArray(output)
@cuda threads=len kernel(input_dev, output_dev)
@test input ≈ Array(output_dev)
end
@testset "scalar through single-value array" begin
function kernel(a, x)
i = (blockIdx().x-1) * blockDim().x + threadIdx().x
max = gridDim().x * blockDim().x
if i == max
_val = a[i]
x[] = _val
end
return
end
arr = round.(rand(Float32, dims) * 100)
val = [0f0]
arr_dev = CuArray(arr)
val_dev = CuArray(val)
@cuda threads=len kernel(arr_dev, val_dev)
@test arr[dims...] ≈ Array(val_dev)[1]
end
@testset "scalar through single-value array, using device function" begin
function child(a, i)
return a[i]
end
@noinline function parent(a, x)
i = (blockIdx().x-1) * blockDim().x + threadIdx().x
max = gridDim().x * blockDim().x
if i == max
_val = child(a, i)
x[] = _val
end
return
end
arr = round.(rand(Float32, dims) * 100)
val = [0f0]
arr_dev = CuArray(arr)
val_dev = CuArray(val)
@cuda threads=len parent(arr_dev, val_dev)
@test arr[dims...] ≈ Array(val_dev)[1]
end
@testset "tuples" begin
# issue #7: tuples not passed by pointer
function kernel(keeps, out)
if keeps[1]
out[] = 1
else
out[] = 2
end
return
end
keeps = (true,)
d_out = CuArray(zeros(Int))
@cuda kernel(keeps, d_out)
@test Array(d_out)[] == 1
end
@testset "ghost function parameters" begin
# bug: ghost type function parameters are elided by the compiler
len = 60
a = rand(Float32, len)
b = rand(Float32, len)
c = similar(a)
d_a = CuArray(a)
d_b = CuArray(b)
d_c = CuArray(c)
@eval struct ExecGhost end
function kernel(ghost, a, b, c)
i = (blockIdx().x-1) * blockDim().x + threadIdx().x
c[i] = a[i] + b[i]
return
end
@cuda threads=len kernel(ExecGhost(), d_a, d_b, d_c)
@test a+b == Array(d_c)
# bug: ghost type function parameters confused aggregate type rewriting
function kernel(ghost, out, aggregate)
i = (blockIdx().x-1) * blockDim().x + threadIdx().x
out[i] = aggregate[1]
return
end
@cuda threads=len kernel(ExecGhost(), d_c, (42,))
@test all(val->val==42, Array(d_c))
end
@testset "immutables" begin
# issue #15: immutables not passed by pointer
function kernel(ptr, b)
ptr[] = imag(b)
return
end
arr = CuArray(zeros(Float32))
x = ComplexF32(2,2)
@cuda kernel(arr, x)
@test Array(arr)[] == imag(x)
end
@testset "automatic recompilation" begin
arr = CuArray(zeros(Int))
function kernel(ptr)
ptr[] = 1
return
end
@cuda kernel(arr)
@test Array(arr)[] == 1
function kernel(ptr)
ptr[] = 2
return
end
@cuda kernel(arr)
@test Array(arr)[] == 2
end
@testset "automatic recompilation (bis)" begin
arr = CuArray(zeros(Int))
@eval doit(ptr) = ptr[] = 1
function kernel(ptr)
doit(ptr)
return
end
@cuda kernel(arr)
@test Array(arr)[] == 1
@eval doit(ptr) = ptr[] = 2
@cuda kernel(arr)
@test Array(arr)[] == 2
end
@testset "non-isbits arguments" begin
function kernel1(T, i)
sink(i)
return
end
@cuda kernel1(Int, 1)
function kernel2(T, i)
sink(unsafe_trunc(T,i))
return
end
@cuda kernel2(Int, 1.)
end
@testset "splatting" begin
function kernel(out, a, b)
out[] = a+b
return
end
out = [0]
out_dev = CuArray(out)
@cuda kernel(out_dev, 1, 2)
@test Array(out_dev)[1] == 3
all_splat = (out_dev, 3, 4)
@cuda kernel(all_splat...)
@test Array(out_dev)[1] == 7
partial_splat = (5, 6)
@cuda kernel(out_dev, partial_splat...)
@test Array(out_dev)[1] == 11
end
@testset "object invoke" begin
# this mimics what is generated by closure conversion
@eval struct KernelObject{T} <: Function
val::T
end
function (self::KernelObject)(a)
a[] = self.val
return
end
function outer(a, val)
inner = KernelObject(val)
@cuda inner(a)
end
a = [1.]
a_dev = CuArray(a)
outer(a_dev, 2.)
@test Array(a_dev) ≈ [2.]
end
@testset "closures" begin
function outer(a_dev, val)
function inner(a)
# captures `val`
a[] = val
return
end
@cuda inner(a_dev)
end
a = [1.]
a_dev = CuArray(a)
outer(a_dev, 2.)
@test Array(a_dev) ≈ [2.]
end
@testset "conversions" begin
@eval struct Host end
@eval struct Device end
Adapt.adapt_storage(::CUDA.Adaptor, a::Host) = Device()
Base.convert(::Type{Int}, ::Host) = 1
Base.convert(::Type{Int}, ::Device) = 2
out = [0]
# convert arguments
out_dev = CuArray(out)
let arg = Host()
@test Array(out_dev) ≈ [0]
function kernel(arg, out)
out[] = convert(Int, arg)
return
end
@cuda kernel(arg, out_dev)
@test Array(out_dev) ≈ [2]
end
# convert tuples
out_dev = CuArray(out)
let arg = (Host(),)
@test Array(out_dev) ≈ [0]
function kernel(arg, out)
out[] = convert(Int, arg[1])
return
end
@cuda kernel(arg, out_dev)
@test Array(out_dev) ≈ [2]
end
# convert named tuples
out_dev = CuArray(out)
let arg = (a=Host(),)
@test Array(out_dev) ≈ [0]
function kernel(arg, out)
out[] = convert(Int, arg.a)
return
end
@cuda kernel(arg, out_dev)
@test Array(out_dev) ≈ [2]
end
# don't convert structs
out_dev = CuArray(out)
@eval struct Nested
a::Host
end
let arg = Nested(Host())
@test Array(out_dev) ≈ [0]
function kernel(arg, out)
out[] = convert(Int, arg.a)
return
end
@cuda kernel(arg, out_dev)
@test Array(out_dev) ≈ [1]
end
end
@testset "argument count" begin
val = [0]
val_dev = CuArray(val)
for i in (1, 10, 20, 34)
variables = ('a':'z'..., 'A':'Z'...)
params = [Symbol(variables[j]) for j in 1:i]
# generate a kernel
body = quote
function kernel(arr, $(params...))
arr[] = $(Expr(:call, :+, params...))
return
end
end
eval(body)
args = [j for j in 1:i]
call = Expr(:call, :kernel, val_dev, args...)
cudacall = :(@cuda $call)
eval(cudacall)
@test Array(val_dev)[1] == sum(args)
end
end
@testset "keyword arguments" begin
@eval inner_kwargf(foobar;foo=1, bar=2) = nothing
@cuda (()->inner_kwargf(42;foo=1,bar=2))()
@cuda (()->inner_kwargf(42))()
@cuda (()->inner_kwargf(42;foo=1))()
@cuda (()->inner_kwargf(42;bar=2))()
@cuda (()->inner_kwargf(42;bar=2,foo=1))()
end
@testset "captured values" begin
function f(capture::T) where {T}
function kernel(ptr)
ptr[] = capture
return
end
arr = CuArray(zeros(T))
@cuda kernel(arr)
return Array(arr)[1]
end
using Test
@test f(1) == 1
@test f(2) == 2
end
end
############################################################################################
@testset "shmem divergence bug" begin
@testset "trap" begin
function trap()
ccall("llvm.trap", llvmcall, Cvoid, ())
end
function kernel(input::Int32, output::Core.LLVMPtr{Int32}, yes::Bool=true)
i = threadIdx().x
temp = @cuStaticSharedMem(Cint, 1)
if i == 1
yes || trap()
temp[1] = input
end
sync_threads()
yes || trap()
unsafe_store!(output, temp[1], i)
return nothing
end
input = rand(Cint(1):Cint(100))
N = 2
let output = CuArray(zeros(Cint, N))
# defaulting to `true` embeds this info in the PTX module,
# allowing `ptxas` to emit validly-structured code.
ptr = pointer(output)
@cuda threads=N kernel(input, ptr)
@test Array(output) == fill(input, N)
end
let output = CuArray(zeros(Cint, N))
ptr = pointer(output)
@cuda threads=N kernel(input, ptr, true)
@test Array(output) == fill(input, N)
end
end
@testset "unreachable" begin
function unreachable()
@cuprintln("go home ptxas you're drunk")
Base.llvmcall("unreachable", Cvoid, Tuple{})
end
function kernel(input::Int32, output::Core.LLVMPtr{Int32}, yes::Bool=true)
i = threadIdx().x
temp = @cuStaticSharedMem(Cint, 1)
if i == 1
yes || unreachable()
temp[1] = input
end
sync_threads()
yes || unreachable()
unsafe_store!(output, temp[1], i)
return nothing
end
input = rand(Cint(1):Cint(100))
N = 2
let output = CuArray(zeros(Cint, N))
# defaulting to `true` embeds this info in the PTX module,
# allowing `ptxas` to emit validly-structured code.
ptr = pointer(output)
@cuda threads=N kernel(input, ptr)
@test Array(output) == fill(input, N)
end
let output = CuArray(zeros(Cint, N))
ptr = pointer(output)
@cuda threads=N kernel(input, ptr, true)
@test Array(output) == fill(input, N)
end
end
@testset "mapreduce (full)" begin
function mapreduce_gpu(f::Function, op::Function, A::CuArray{T, N}; dims = :, init...) where {T, N}
OT = Float32
v0 = 0.0f0
threads = 256
out = CuArray{OT}(undef, (1,))
@cuda threads=threads reduce_kernel(f, op, v0, A, Val{threads}(), out)
Array(out)[1]
end
function reduce_kernel(f, op, v0::T, A, ::Val{LMEM}, result) where {T, LMEM}
tmp_local = @cuStaticSharedMem(T, LMEM)
global_index = threadIdx().x
acc = v0
# Loop sequentially over chunks of input vector
while global_index <= length(A)
element = f(A[global_index])
acc = op(acc, element)
global_index += blockDim().x
end
# Perform parallel reduction
local_index = threadIdx().x - 1
@inbounds tmp_local[local_index + 1] = acc
sync_threads()
offset = blockDim().x ÷ 2
while offset > 0
@inbounds if local_index < offset
other = tmp_local[local_index + offset + 1]
mine = tmp_local[local_index + 1]
tmp_local[local_index + 1] = op(mine, other)
end
sync_threads()
offset = offset ÷ 2
end
if local_index == 0
result[blockIdx().x] = @inbounds tmp_local[1]
end
return
end
A = rand(Float32, 1000)
dA = CuArray(A)
@test mapreduce(identity, +, A) ≈ mapreduce_gpu(identity, +, dA)
end
@testset "mapreduce (full, complex)" begin
function mapreduce_gpu(f::Function, op::Function, A::CuArray{T, N}; dims = :, init...) where {T, N}
OT = Complex{Float32}
v0 = 0.0f0+0im
threads = 256
out = CuArray{OT}(undef, (1,))
@cuda threads=threads reduce_kernel(f, op, v0, A, Val{threads}(), out)
Array(out)[1]
end
function reduce_kernel(f, op, v0::T, A, ::Val{LMEM}, result) where {T, LMEM}
tmp_local = @cuStaticSharedMem(T, LMEM)
global_index = threadIdx().x
acc = v0
# Loop sequentially over chunks of input vector
while global_index <= length(A)
element = f(A[global_index])
acc = op(acc, element)
global_index += blockDim().x
end
# Perform parallel reduction
local_index = threadIdx().x - 1
@inbounds tmp_local[local_index + 1] = acc
sync_threads()
offset = blockDim().x ÷ 2
while offset > 0
@inbounds if local_index < offset
other = tmp_local[local_index + offset + 1]
mine = tmp_local[local_index + 1]
tmp_local[local_index + 1] = op(mine, other)
end
sync_threads()
offset = offset ÷ 2
end
if local_index == 0
result[blockIdx().x] = @inbounds tmp_local[1]
end
return
end
A = rand(Complex{Float32}, 1000)
dA = CuArray(A)
@test mapreduce(identity, +, A) ≈ mapreduce_gpu(identity, +, dA)
end
@testset "mapreduce (reduced)" begin
function mapreduce_gpu(f::Function, op::Function, A::CuArray{T, N}) where {T, N}
OT = Int
v0 = 0
out = CuArray{OT}(undef, (1,))
@cuda threads=64 reduce_kernel(f, op, v0, A, out)
Array(out)[1]
end
function reduce_kernel(f, op, v0::T, A, result) where {T}
tmp_local = @cuStaticSharedMem(T, 64)
acc = v0
# Loop sequentially over chunks of input vector
i = threadIdx().x
while i <= length(A)
element = f(A[i])
acc = op(acc, element)
i += blockDim().x
end
# Perform parallel reduction
@inbounds tmp_local[threadIdx().x] = acc
sync_threads()
offset = blockDim().x ÷ 2
while offset > 0
@inbounds if threadIdx().x <= offset
other = tmp_local[(threadIdx().x - 1) + offset + 1]
mine = tmp_local[threadIdx().x]
tmp_local[threadIdx().x] = op(mine, other)
end
sync_threads()
offset = offset ÷ 2
end
if threadIdx().x == 1
result[blockIdx().x] = @inbounds tmp_local[1]
end
return
end
A = rand(1:10, 100)
dA = CuArray(A)
@test mapreduce(identity, +, A) ≈ mapreduce_gpu(identity, +, dA)
end
end
############################################################################################
@testset "dynamic parallelism" begin
@testset "basic usage" begin
function hello()
@cuprint("Hello, ")
@cuda dynamic=true world()
return
end
@eval function world()
@cuprint("World!")
return
end
_, out = @grab_output begin
@cuda hello()
synchronize()
end
@test out == "Hello, World!"
end
@testset "anonymous functions" begin
function hello()
@cuprint("Hello, ")
world = () -> (@cuprint("World!"); nothing)
@cuda dynamic=true world()
return
end
_, out = @grab_output begin
@cuda hello()
synchronize()
end
@test out == "Hello, World!"
end
if VERSION >= v"1.1" # behavior of captured variables (box or not) has improved over time
@testset "closures" begin
function hello()
x = 1
@cuprint("Hello, ")
world = () -> (@cuprint("World $(x)!"); nothing)
@cuda dynamic=true world()
return
end
_, out = @grab_output begin
@cuda hello()
synchronize()
end
@test out == "Hello, World 1!"
end
end
@testset "argument passing" begin
## padding
function kernel(a, b, c)
@cuprint("$a $b $c")
return
end
for args in ((Int16(1), Int32(2), Int64(3)), # padding
(Int32(1), Int32(2), Int32(3)), # no padding, equal size
(Int64(1), Int32(2), Int16(3)), # no padding, inequal size
(Int16(1), Int64(2), Int32(3))) # mixed
_, out = @grab_output begin
@cuda kernel(args...)
synchronize()
end
@test out == "1 2 3"
end
## conversion
function kernel(a)
increment(a) = (a[1] += 1; nothing)
a[1] = 1
increment(a)
@cuda dynamic=true increment(a)
return
end
dA = CuArray{Int}(undef, (1,))
@cuda kernel(dA)
A = Array(dA)
@test A == [3]
end
@testset "self-recursion" begin
@eval function kernel(x::Bool)
if x
@cuprint("recurse ")
@cuda dynamic=true kernel(false)
else
@cuprint("stop")
end
return
end
_, out = @grab_output begin
@cuda kernel(true)
synchronize()
end
@test out == "recurse stop"
end
@testset "deep recursion" begin
@eval function kernel_a(x::Bool)
@cuprint("a ")
@cuda dynamic=true kernel_b(x)
return
end
@eval function kernel_b(x::Bool)
@cuprint("b ")
@cuda dynamic=true kernel_c(x)
return
end
@eval function kernel_c(x::Bool)
@cuprint("c ")
if x
@cuprint("recurse ")
@cuda dynamic=true kernel_a(false)
else
@cuprint("stop")
end
return
end
_, out = @grab_output begin
@cuda kernel_a(true)
synchronize()
end
@test out == "a b c recurse a b c stop"
end
@testset "streams" begin
function hello()
@cuprint("Hello, ")
s = CuDeviceStream()
@cuda dynamic=true stream=s world()
CUDA.unsafe_destroy!(s)
return
end
@eval function world()
@cuprint("World!")
return
end
_, out = @grab_output begin
@cuda hello()
synchronize()
end
@test out == "Hello, World!"
end
@testset "parameter alignment" begin
# foo is unused, but determines placement of bar
function child(x, foo, bar)
x[] = sum(bar)
return
end
function parent(x, foo, bar)
@cuda dynamic=true child(x, foo, bar)
return
end
for (Foo, Bar) in [(Tuple{},NTuple{8,Int}), # JuliaGPU/CUDA.jl#263
(Tuple{Int32},Tuple{Int16}),
(Tuple{Int16},Tuple{Int32,Int8,Int16,Int64,Int16,Int16})]
foo = (Any[T(i) for (i,T) in enumerate(Foo.parameters)]...,)
bar = (Any[T(i) for (i,T) in enumerate(Bar.parameters)]...,)
x, y = CUDA.zeros(Int, 1), CUDA.zeros(Int, 1)
@cuda child(x, foo, bar)
@cuda parent(y, foo, bar)
@test sum(bar) == Array(x)[] == Array(y)[]
end
end
@testset "many arguments" begin
# JuliaGPU/CUDA.jl#401
function dp_5arg_kernel(v1, v2, v3, v4, v5)
return nothing
end
function dp_6arg_kernel(v1, v2, v3, v4, v5, v6)
return nothing
end
function main_5arg_kernel()
@cuda threads=1 dynamic=true dp_5arg_kernel(1, 1, 1, 1, 1)
return nothing
end
function main_6arg_kernel()
@cuda threads=1 dynamic=true dp_6arg_kernel(1, 1, 1, 1, 1, 1)
return nothing
end
@cuda threads=1 dp_5arg_kernel(1, 1, 1, 1, 1)
@cuda threads=1 dp_6arg_kernel(1, 1, 1, 1, 1, 1)
@cuda threads=1 main_5arg_kernel()
@cuda threads=1 main_6arg_kernel()
end