diff options
Diffstat (limited to 'erts/emulator/beam/erl_db_hash.c')
| -rw-r--r-- | erts/emulator/beam/erl_db_hash.c | 13 |
1 files changed, 6 insertions, 7 deletions
diff --git a/erts/emulator/beam/erl_db_hash.c b/erts/emulator/beam/erl_db_hash.c index 4c4ff9b470..74979f984a 100644 --- a/erts/emulator/beam/erl_db_hash.c +++ b/erts/emulator/beam/erl_db_hash.c @@ -95,8 +95,7 @@ /* * The following symbols can be manipulated to "tune" the linear hash array */ -#define GROW_LIMIT(NACTIVE) ((NACTIVE)*2) -#define SHRINK_LIMIT(NACTIVE) ((NACTIVE) / 2) +#define CHAIN_LEN 6 /* Medium bucket chain len */ /* Number of slots per segment */ #define SEGSZ_EXP 8 @@ -464,7 +463,7 @@ db_finalize_dbterm_hash(int cret, DbUpdateHandle* handle); static ERTS_INLINE void try_shrink(DbTableHash* tb) { int nactive = NACTIVE(tb); - if (nactive > SEGSZ && NITEMS(tb) < SHRINK_LIMIT(nactive) + if (nactive > SEGSZ && NITEMS(tb) < (nactive * CHAIN_LEN) && !IS_FIXED(tb)) { shrink(tb, nactive); } @@ -863,7 +862,7 @@ Lnew: WUNLOCK_HASH(lck); { int nactive = NACTIVE(tb); - if (nitems > GROW_LIMIT(nactive) && !IS_FIXED(tb)) { + if (nitems > nactive * (CHAIN_LEN+1) && !IS_FIXED(tb)) { grow(tb, nactive); } } @@ -2251,12 +2250,12 @@ static int db_free_table_continue_hash(DbTable *tbl) done /= 2; while(tb->nslots != 0) { - done += 1 + SEGSZ/64 + free_seg(tb, 1); + free_seg(tb, 1); /* * If we have done enough work, get out here. */ - if (done >= DELETE_RECORD_LIMIT) { + if (++done >= (DELETE_RECORD_LIMIT / CHAIN_LEN / SEGSZ)) { return 0; /* Not done */ } } @@ -2872,7 +2871,7 @@ db_lookup_dbterm_hash(Process *p, DbTable *tbl, Eterm key, Eterm obj, int nitems = erts_smp_atomic_inc_read_nob(&tb->common.nitems); int nactive = NACTIVE(tb); - if (nitems > GROW_LIMIT(nactive) && !IS_FIXED(tb)) { + if (nitems > nactive * (CHAIN_LEN + 1) && !IS_FIXED(tb)) { grow(tb, nactive); } } |