Fix workgroup size determinaiton

Author: christiangnrd

lib/JLArrays/Project.toml

@@ -1,7 +1,7 @@
 name = "JLArrays"
 uuid = "27aeb0d3-9eb9-45fb-866b-73c2ecf80fcb"
 authors = ["Tim Besard <tim.besard@gmail.com>"]
-version = "0.3.0"
+version = "0.3.1"
 
 [deps]
 Adapt = "79e6a3ab-5dfb-504d-930d-738a2a938a0e"

lib/JLArrays/src/JLArrays.jl

@@ -600,7 +600,7 @@ KernelAbstractions.allocate(::JLBackend, ::Type{T}, dims::Tuple) where T = JLArr
     end
 
     if KernelAbstractions.workgroupsize(kernel) <: DynamicSize && workgroupsize === nothing
-        workgroupsize = (1024,) # Vectorization, 4x unrolling, minimal grain size
+        workgroupsize = (MAXTHREADS,) # Vectorization, 4x unrolling, minimal grain size
     end
     iterspace, dynamic = partition(kernel, ndrange, workgroupsize)
     # partition checked that the ndrange's agreed
@@ -626,6 +626,7 @@ else
 end
 
 function (obj::Kernel{JLBackend})(args...; ndrange=nothing, workgroupsize=nothing)
+    ndrange, workgroupsize, _, _ = launch_config(obj, ndrange, workgroupsize)
     device_args = jlconvert.(args)
     new_obj = convert_to_cpu(obj)
     new_obj(device_args...; ndrange, workgroupsize)