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[release-1.6] Disable affinity testing when run inside of cpusets #47968

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Merged
Parent: release-1.6: Backports for Julia 1.6.8
merged 1 commit into from
Dec 23, 2022
Merged

[release-1.6] Disable affinity testing when run inside of cpusets #47968

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25 changes: 24 additions & 1 deletion test/threads.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -14,8 +14,31 @@ running_under_rr() = 0 == ccall(:syscall, Int,
(Int, Int, Int, Int, Int, Int, Int),
SYS_rrcall_check_presence, 0, 0, 0, 0, 0, 0)

const uv_thread_t = UInt # TODO: this is usually correct (or tolerated by the API), but not guaranteed

function uv_thread_getaffinity()
masksize = ccall(:uv_cpumask_size, Cint, ())
self = ccall(:uv_thread_self, uv_thread_t, ())
ref = Ref(self)
cpumask = zeros(Bool, masksize)
err = ccall(
:uv_thread_getaffinity,
Cint,
(Ref{uv_thread_t}, Ptr{Bool}, Cssize_t),
ref,
cpumask,
masksize,
)
Base.uv_error("getaffinity", err)
n = something(findlast(cpumask)) # we must have at least one active core
resize!(cpumask, n)
return cpumask
end

if Sys.islinux()
if Sys.CPU_THREADS > 1 && Sys.which("taskset") !== nothing && !running_under_rr()
# Only run this test if we can run on CPUs 0 and 1
allowed_cpus = findall(uv_thread_getaffinity())
if all(x ∈ allowed_cpus for x in (1,2)) && Sys.which("taskset") !== nothing && !running_under_rr()
run_with_affinity(spec) = readchomp(`taskset -c $spec $(Base.julia_cmd()) -e "run(\`taskset -p \$(getpid())\`)"`)
@test endswith(run_with_affinity("1"), "2")
@test endswith(run_with_affinity("0,1"), "3")
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