From 9168ca6edd9818eadbe5ec2c56462fe6c859e201 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Fri, 10 Jul 2026 12:04:37 +0000
Subject: [PATCH 1/2] Initial plan


From f898b65ddfc83f63a6e92bb2e1cf9bb97017ea63 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Fri, 10 Jul 2026 12:11:37 +0000
Subject: [PATCH 2/2] Use Threads.nthreads() instead of Sys.CPU_THREADS/2 to
 set FFTW thread count

---
 src/libfasttransforms.jl       | 2 +-
 test/libfasttransformstests.jl | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/libfasttransforms.jl b/src/libfasttransforms.jl
index 3ce492d9..66a1278a 100644
--- a/src/libfasttransforms.jl
+++ b/src/libfasttransforms.jl
@@ -13,7 +13,7 @@ ft_set_num_threads(n::Integer) = ccall((:ft_set_num_threads, libfasttransforms),
 ft_fftw_plan_with_nthreads(n::Integer) = ccall((:ft_fftw_plan_with_nthreads, libfasttransforms), Cvoid, (Cint, ), n)
 
 function __init__()
-    n = ceil(Int, Sys.CPU_THREADS/2)
+    n = Threads.nthreads()
     ft_set_num_threads(n)
     ccall((:ft_fftw_init_threads, libfasttransforms), Cint, ())
     ft_fftw_plan_with_nthreads(n)
diff --git a/test/libfasttransformstests.jl b/test/libfasttransformstests.jl
index 545da7d9..f7bda1d0 100644
--- a/test/libfasttransformstests.jl
+++ b/test/libfasttransformstests.jl
@@ -1,6 +1,6 @@
 using FastTransforms, Test
 
-FastTransforms.ft_set_num_threads(ceil(Int, Base.Sys.CPU_THREADS/2))
+FastTransforms.ft_set_num_threads(Threads.nthreads())
 
 @testset "libfasttransforms" begin
     n = 64