project-base/server-skynet-source-3rd-jemalloc
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Set the default number of background threads to 4.

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The setting has been tested in production for a while.  No negative effect while
we were able to reduce number of threads per process.
This commit is contained in:
Qi Wang 2018-11-15 13:01:05 -08:00 committed by Qi Wang
parent 43f3b1ad0c
commit c4063ce439
2 changed files with 4 additions and 4 deletions
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1
include/jemalloc/internal/background_thread_structs.h
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@ -9,6 +9,7 @@
#define BACKGROUND_THREAD_INDEFINITE_SLEEP UINT64_MAX #define BACKGROUND_THREAD_INDEFINITE_SLEEP UINT64_MAX
#define MAX_BACKGROUND_THREAD_LIMIT MALLOCX_ARENA_LIMIT #define MAX_BACKGROUND_THREAD_LIMIT MALLOCX_ARENA_LIMIT
#define DEFAULT_NUM_BACKGROUND_THREAD 4
typedef enum { typedef enum {
background_thread_stopped, background_thread_stopped,

7
src/background_thread.c
View File

@ -13,7 +13,7 @@ JEMALLOC_DIAGNOSTIC_DISABLE_SPURIOUS
#define BACKGROUND_THREAD_DEFAULT false #define BACKGROUND_THREAD_DEFAULT false
/* Read-only after initialization. */ /* Read-only after initialization. */
bool opt_background_thread = BACKGROUND_THREAD_DEFAULT; bool opt_background_thread = BACKGROUND_THREAD_DEFAULT;
size_t opt_max_background_threads = MAX_BACKGROUND_THREAD_LIMIT; size_t opt_max_background_threads = MAX_BACKGROUND_THREAD_LIMIT + 1;
/* Used for thread creation, termination and stats. */ /* Used for thread creation, termination and stats. */
malloc_mutex_t background_thread_lock; malloc_mutex_t background_thread_lock;
@ -872,9 +872,8 @@ background_thread_boot1(tsdn_t *tsdn) {
assert(have_background_thread); assert(have_background_thread);
assert(narenas_total_get() > 0); assert(narenas_total_get() > 0);
if (opt_max_background_threads == MAX_BACKGROUND_THREAD_LIMIT && if (opt_max_background_threads > MAX_BACKGROUND_THREAD_LIMIT) {
ncpus < MAX_BACKGROUND_THREAD_LIMIT) { opt_max_background_threads = DEFAULT_NUM_BACKGROUND_THREAD;
opt_max_background_threads = ncpus;
} }
max_background_threads = opt_max_background_threads; max_background_threads = opt_max_background_threads;