Set the default number of background threads to 4.
The setting has been tested in production for a while. No negative effect while we were able to reduce number of threads per process.
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@ -9,6 +9,7 @@
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#define BACKGROUND_THREAD_INDEFINITE_SLEEP UINT64_MAX
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#define MAX_BACKGROUND_THREAD_LIMIT MALLOCX_ARENA_LIMIT
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#define DEFAULT_NUM_BACKGROUND_THREAD 4
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typedef enum {
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background_thread_stopped,
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@ -13,7 +13,7 @@ JEMALLOC_DIAGNOSTIC_DISABLE_SPURIOUS
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#define BACKGROUND_THREAD_DEFAULT false
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/* Read-only after initialization. */
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bool opt_background_thread = BACKGROUND_THREAD_DEFAULT;
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size_t opt_max_background_threads = MAX_BACKGROUND_THREAD_LIMIT;
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size_t opt_max_background_threads = MAX_BACKGROUND_THREAD_LIMIT + 1;
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/* Used for thread creation, termination and stats. */
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malloc_mutex_t background_thread_lock;
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@ -872,9 +872,8 @@ background_thread_boot1(tsdn_t *tsdn) {
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assert(have_background_thread);
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assert(narenas_total_get() > 0);
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if (opt_max_background_threads == MAX_BACKGROUND_THREAD_LIMIT &&
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ncpus < MAX_BACKGROUND_THREAD_LIMIT) {
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opt_max_background_threads = ncpus;
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if (opt_max_background_threads > MAX_BACKGROUND_THREAD_LIMIT) {
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opt_max_background_threads = DEFAULT_NUM_BACKGROUND_THREAD;
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}
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max_background_threads = opt_max_background_threads;
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