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authorLukas Larsson <[email protected]>2014-12-19 10:53:27 +0100
committerLukas Larsson <[email protected]>2014-12-19 10:53:27 +0100
commit3e3ef7b16fa03a7b9f4e5376387750a69957719f (patch)
tree40d74a3d6ccd8a4faa5c7194979584fa67517ea1 /erts/emulator/beam/erl_db_hash.c
parenta4d72d2cae3a9bd3f0dccdb663f70d54a45fe10f (diff)
parentbd4b900c09308a6c3ab41e3a2070cb90410ee01d (diff)
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Merge branch 'lukas/erts/crashdump_improvements/OTP-12377'
* lukas/erts/crashdump_improvements/OTP-12377: erts: Make main thread safe from pipe closed event erts: Improve crash dumps erts: Rename sys_sigset to sys_signal erts: Introduce thread suspend functions erts: Remove usage of QUANTIFY signal erts: Add support for thread names ets: Increase data available in crash dumps and ets:info erts: Start compilation of beam_emu earlier
Diffstat (limited to 'erts/emulator/beam/erl_db_hash.c')
-rw-r--r--erts/emulator/beam/erl_db_hash.c55
1 files changed, 34 insertions, 21 deletions
diff --git a/erts/emulator/beam/erl_db_hash.c b/erts/emulator/beam/erl_db_hash.c
index 6e8d892561..c2157457a0 100644
--- a/erts/emulator/beam/erl_db_hash.c
+++ b/erts/emulator/beam/erl_db_hash.c
@@ -648,25 +648,6 @@ restart:
/* ToDo: Maybe try grow/shrink the table as well */
}
-/* Only used by tests
-*/
-Uint db_kept_items_hash(DbTableHash *tb)
-{
- Uint kept_items = 0;
- Uint ix = 0;
- erts_smp_rwmtx_t* lck = RLOCK_HASH(tb,ix);
- HashDbTerm* b;
- do {
- for (b = BUCKET(tb, ix); b != NULL; b = b->next) {
- if (b->hvalue == INVALID_HASH) {
- ++kept_items;
- }
- }
- ix = next_slot(tb, ix, &lck);
- }while (ix);
- return kept_items;
-}
-
int db_create_hash(Process *p, DbTable *tbl)
{
DbTableHash *tb = &tbl->hash;
@@ -2161,10 +2142,38 @@ int db_mark_all_deleted_hash(DbTable *tbl)
static void db_print_hash(int to, void *to_arg, int show, DbTable *tbl)
{
DbTableHash *tb = &tbl->hash;
+ DbHashStats stats;
int i;
erts_print(to, to_arg, "Buckets: %d\n", NACTIVE(tb));
-
+
+#ifdef ERTS_SMP
+ i = tbl->common.is_thread_safe;
+ /* If crash dumping we set table to thread safe in order to
+ avoid taking any locks */
+ if (ERTS_IS_CRASH_DUMPING)
+ tbl->common.is_thread_safe = 1;
+
+ db_calc_stats_hash(&tbl->hash, &stats);
+
+ tbl->common.is_thread_safe = i;
+#else
+ db_calc_stats_hash(&tbl->hash, &stats);
+#endif
+
+ erts_print(to, to_arg, "Chain Length Avg: %f\n", stats.avg_chain_len);
+ erts_print(to, to_arg, "Chain Length Max: %d\n", stats.max_chain_len);
+ erts_print(to, to_arg, "Chain Length Min: %d\n", stats.min_chain_len);
+ erts_print(to, to_arg, "Chain Length Std Dev: %f\n",
+ stats.std_dev_chain_len);
+ erts_print(to, to_arg, "Chain Length Expected Std Dev: %f\n",
+ stats.std_dev_expected);
+
+ if (IS_FIXED(tb))
+ erts_print(to, to_arg, "Fixed: %d\n", stats.kept_items);
+ else
+ erts_print(to, to_arg, "Fixed: false\n");
+
if (show) {
for (i = 0; i < NACTIVE(tb); i++) {
HashDbTerm* list = BUCKET(tb,i);
@@ -2890,6 +2899,7 @@ void db_calc_stats_hash(DbTableHash* tb, DbHashStats* stats)
erts_smp_rwmtx_t* lck;
int sum = 0;
int sq_sum = 0;
+ int kept_items = 0;
int ix;
int len;
@@ -2901,6 +2911,8 @@ void db_calc_stats_hash(DbTableHash* tb, DbHashStats* stats)
len = 0;
for (b = BUCKET(tb,ix); b!=NULL; b=b->next) {
len++;
+ if (b->hvalue == INVALID_HASH)
+ ++kept_items;
}
sum += len;
sq_sum += len*len;
@@ -2912,7 +2924,8 @@ void db_calc_stats_hash(DbTableHash* tb, DbHashStats* stats)
stats->std_dev_chain_len = sqrt((sq_sum - stats->avg_chain_len*sum) / NACTIVE(tb));
/* Expected standard deviation from a good uniform hash function,
ie binomial distribution (not taking the linear hashing into acount) */
- stats->std_dev_expected = sqrt(stats->avg_chain_len * (1 - 1.0/NACTIVE(tb)));
+ stats->std_dev_expected = sqrt(stats->avg_chain_len * (1 - 1.0/NACTIVE(tb)));
+ stats->kept_items = kept_items;
}
#ifdef HARDDEBUG