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diff --git a/test/runtests.jl b/test/runtests.jl
index 2f9cd058bb..150395e78c 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -4,7 +4,7 @@ using Test
using Distributed
using Dates
import REPL
-using Printf: @sprintf
+using Printf: @sprintf, @printf
using Base: Experimental
include("choosetests.jl")
@@ -83,11 +83,15 @@ prepend!(tests, linalg_tests)
import LinearAlgebra
cd(@__DIR__) do
n = 1
- if net_on
+ # Allow parallel tests with isolated environment
+ # https://github.com/JuliaLang/julia/issues/43205
+ # https://github.com/JuliaLang/julia/pull/43211
+ if net_on || haskey(ENV, "JULIA_CPU_THREADS")
n = min(Sys.CPU_THREADS, length(tests))
n > 1 && addprocs_with_testenv(n)
LinearAlgebra.BLAS.set_num_threads(1)
end
+ @printf("Number of threads: %i\n", n)
skipped = 0
@everywhere include("testdefs.jl")
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