diff options
Diffstat (limited to 'erts/emulator/beam/erl_db.c')
| -rw-r--r-- | erts/emulator/beam/erl_db.c | 43 |
1 files changed, 42 insertions, 1 deletions
diff --git a/erts/emulator/beam/erl_db.c b/erts/emulator/beam/erl_db.c index 2e2cb98354..844272c699 100644 --- a/erts/emulator/beam/erl_db.c +++ b/erts/emulator/beam/erl_db.c @@ -279,6 +279,8 @@ static ERTS_INLINE void db_init_lock(DbTable* tb, int use_frequent_read_lock, erts_smp_rwmtx_opt_t rwmtx_opt = ERTS_SMP_RWMTX_OPT_DEFAULT_INITER; if (use_frequent_read_lock) rwmtx_opt.type = ERTS_SMP_RWMTX_TYPE_FREQUENT_READ; + if (erts_ets_rwmtx_spin_count >= 0) + rwmtx_opt.main_spincount = erts_ets_rwmtx_spin_count; #endif #ifdef ERTS_SMP erts_smp_rwmtx_init_opt_x(&tb->common.rwlock, &rwmtx_opt, @@ -2856,10 +2858,11 @@ BIF_RETTYPE ets_match_spec_run_r_3(BIF_ALIST_3) ** External interface (NOT BIF's) */ +int erts_ets_rwmtx_spin_count = -1; /* Init the db */ -void init_db(void) +void init_db(ErtsDbSpinCount db_spin_count) { DbTable init_tb; int i; @@ -2868,10 +2871,48 @@ void init_db(void) size_t size; #ifdef ERTS_SMP + int max_spin_count = (1 << 15) - 1; /* internal limit */ erts_smp_rwmtx_opt_t rwmtx_opt = ERTS_SMP_RWMTX_OPT_DEFAULT_INITER; rwmtx_opt.type = ERTS_SMP_RWMTX_TYPE_FREQUENT_READ; rwmtx_opt.lived = ERTS_SMP_RWMTX_LONG_LIVED; + switch (db_spin_count) { + case ERTS_DB_SPNCNT_NONE: + erts_ets_rwmtx_spin_count = 0; + break; + case ERTS_DB_SPNCNT_VERY_LOW: + erts_ets_rwmtx_spin_count = 100; + break; + case ERTS_DB_SPNCNT_LOW: + erts_ets_rwmtx_spin_count = 200; + erts_ets_rwmtx_spin_count += erts_no_schedulers * 50; + if (erts_ets_rwmtx_spin_count > 1000) + erts_ets_rwmtx_spin_count = 1000; + break; + case ERTS_DB_SPNCNT_HIGH: + erts_ets_rwmtx_spin_count = 2000; + erts_ets_rwmtx_spin_count += erts_no_schedulers * 100; + if (erts_ets_rwmtx_spin_count > 15000) + erts_ets_rwmtx_spin_count = 15000; + break; + case ERTS_DB_SPNCNT_VERY_HIGH: + erts_ets_rwmtx_spin_count = 15000; + erts_ets_rwmtx_spin_count += erts_no_schedulers * 500; + if (erts_ets_rwmtx_spin_count > max_spin_count) + erts_ets_rwmtx_spin_count = max_spin_count; + break; + case ERTS_DB_SPNCNT_EXTREMELY_HIGH: + erts_ets_rwmtx_spin_count = max_spin_count; + break; + case ERTS_DB_SPNCNT_NORMAL: + default: + erts_ets_rwmtx_spin_count = -1; + break; + } + + if (erts_ets_rwmtx_spin_count >= 0) + rwmtx_opt.main_spincount = erts_ets_rwmtx_spin_count; + meta_main_tab_locks = erts_alloc_permanent_cache_aligned(ERTS_ALC_T_DB_TABLES, sizeof(erts_meta_main_tab_lock_t) |