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Define environment variable for overriding number of jobs #65

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Define environment variable for overriding number of jobs #65

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4 changes: 3 additions & 1 deletion src/ParallelTestRunner.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -360,7 +360,9 @@ Determine default number of parallel jobs.
function default_njobs(; cpu_threads = Sys.CPU_THREADS, free_memory = available_memory())
jobs = cpu_threads
memory_jobs = Int64(free_memory) ÷ (2 * 2^30)
return max(1, min(jobs, memory_jobs))
env_var_num_jobs = tryparse(Int, get(ENV, "PARALLELTESTRUNNER_NUM_JOBS", ""))
# `PARALLELTESTRUNNER_NUM_JOBS` would take precedence over the default calculation.
return something(env_var_num_jobs, max(1, min(jobs, memory_jobs)))
end

# Historical test duration database
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7 changes: 7 additions & 0 deletions test/runtests.jl
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Expand Up @@ -223,4 +223,11 @@ end
@test contains(str, "SUCCESS")
end

@testset "Number of jobs" begin
num_jobs = 1234
withenv("PARALLELTESTRUNNER_NUM_JOBS" => num_jobs) do
@test ParallelTestRunner.default_njobs() == num_jobs
end
end

end