switch to BLAS.get_num_threads

Author: Will Kimmerer

src/SuiteSparseGraphBLAS.jl

@@ -143,7 +143,7 @@ function __init__()
     # In the future this should hopefully allow us to do no-copy passing of arrays between Julia and SS:GrB.
     # In the meantime it helps Julia respond to memory pressure from SS:GrB and finalize things in a timely fashion.
     @wraperror LibGraphBLAS.GxB_init(LibGraphBLAS.GrB_NONBLOCKING, cglobal(:jl_malloc), cglobal(:jl_calloc), cglobal(:jl_realloc), cglobal(:jl_free))
-    gbset(:nthreads, Sys.CPU_THREADS ÷ 2)
+    gbset(:nthreads, BLAS.get_num_threads())
     # Eagerly load selectops constants.
     _loadselectops()
     ALL.p = load_global("GrB_ALL", LibGraphBLAS.GrB_Index)