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Support passing auto as the value to the JULIA_NUM_THREADS environment variable #38952

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Support passing auto as the value to the JULIA_NUM_THREADS environment variable #38952

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13 changes: 9 additions & 4 deletions src/threading.c
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Original file line number Diff line number Diff line change
Expand Up @@ -392,12 +392,17 @@ void jl_init_threading(void)

// how many threads available, usable
jl_n_threads = JULIA_NUM_THREADS;
if (jl_options.nthreads < 0) // --threads=auto
if (jl_options.nthreads < 0) { // --threads=auto
jl_n_threads = jl_cpu_threads();
else if (jl_options.nthreads > 0) // --threads=N
} else if (jl_options.nthreads > 0) { // --threads=N
jl_n_threads = jl_options.nthreads;
else if ((cp = getenv(NUM_THREADS_NAME)))
jl_n_threads = (uint64_t)strtol(cp, NULL, 10);
} else if ((cp = getenv(NUM_THREADS_NAME))) {
if (strcmp(cp, "auto")) {
jl_n_threads = (uint64_t)strtol(cp, NULL, 10); // ENV[NUM_THREADS_NAME] == "N"
} else {
jl_n_threads = jl_cpu_threads(); // ENV[NUM_THREADS_NAME] == "auto"
}
}
if (jl_n_threads <= 0)
jl_n_threads = 1;
#ifndef __clang_analyzer__
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