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authorSverker Eriksson <[email protected]>2015-12-10 15:25:22 +0100
committerSverker Eriksson <[email protected]>2015-12-10 15:25:22 +0100
commit4804ea2aa50af490ab3998466269efa540abd90d (patch)
tree9997f4436bf0c3b0e44472cbb84317864ef3a8df /erts/emulator
parent4179ca9f10cdc78e882ce4496cf0a1261a0129af (diff)
downloadotp-4804ea2aa50af490ab3998466269efa540abd90d.tar.gz
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erts: Add sizeMask for faster proc dict indexing
Diffstat (limited to 'erts/emulator')
-rw-r--r--erts/emulator/beam/erl_process_dict.c26
-rw-r--r--erts/emulator/beam/erl_process_dict.h1
2 files changed, 16 insertions, 11 deletions
diff --git a/erts/emulator/beam/erl_process_dict.c b/erts/emulator/beam/erl_process_dict.c
index 34c1f0c993..97a2828b4e 100644
--- a/erts/emulator/beam/erl_process_dict.c
+++ b/erts/emulator/beam/erl_process_dict.c
@@ -585,6 +585,9 @@ static Eterm pd_hash_put(Process *p, Eterm id, Eterm value)
/* Create it */
ensure_array_size(&p->dictionary, INITIAL_SIZE);
p->dictionary->homeSize = INITIAL_SIZE;
+ p->dictionary->sizeMask = p->dictionary->homeSize*2 - 1;
+ p->dictionary->splitPosition = 0;
+ p->dictionary->numElements = 0;
}
hval = pd_hash_value(p->dictionary, id);
old = ARRAY_GET(p->dictionary, hval);
@@ -718,6 +721,7 @@ static Eterm pd_hash_put(Process *p, Eterm id, Eterm value)
static void shrink(Process *p, Eterm* ret)
{
+ ProcDict *pd = p->dictionary;
unsigned int range = HASH_RANGE(p->dictionary);
unsigned int steps = (range*3) / 10;
Eterm hi, lo, tmp;
@@ -732,8 +736,8 @@ static void shrink(Process *p, Eterm* ret)
}
for (i = 0; i < steps; ++i) {
- ProcDict *pd = p->dictionary;
if (pd->splitPosition == 0) {
+ pd->sizeMask = pd->homeSize - 1;
pd->homeSize /= 2;
pd->splitPosition = pd->homeSize;
}
@@ -742,7 +746,7 @@ static void shrink(Process *p, Eterm* ret)
lo = ARRAY_GET(pd, pd->splitPosition);
if (hi != NIL) {
if (lo == NIL) {
- ARRAY_PUT(p->dictionary, pd->splitPosition, hi);
+ ARRAY_PUT(pd, pd->splitPosition, hi);
} else {
int needed = 4;
if (is_list(hi) && is_list(lo)) {
@@ -761,13 +765,13 @@ static void shrink(Process *p, Eterm* ret)
hp = HeapOnlyAlloc(p, 4);
tmp = CONS(hp, hi, NIL);
hp += 2;
- ARRAY_PUT(p->dictionary, pd->splitPosition,
+ ARRAY_PUT(pd, pd->splitPosition,
CONS(hp,lo,tmp));
hp += 2;
ASSERT(hp <= hp_limit);
} else { /* hi is a list */
hp = HeapOnlyAlloc(p, 2);
- ARRAY_PUT(p->dictionary, pd->splitPosition,
+ ARRAY_PUT(pd, pd->splitPosition,
CONS(hp, lo, hi));
hp += 2;
ASSERT(hp <= hp_limit);
@@ -775,7 +779,7 @@ static void shrink(Process *p, Eterm* ret)
} else { /* lo is a list */
if (is_tuple(hi)) {
hp = HeapOnlyAlloc(p, 2);
- ARRAY_PUT(p->dictionary, pd->splitPosition,
+ ARRAY_PUT(pd, pd->splitPosition,
CONS(hp, hi, lo));
hp += 2;
ASSERT(hp <= hp_limit);
@@ -787,12 +791,12 @@ static void shrink(Process *p, Eterm* ret)
hp += 2;
}
ASSERT(hp <= hp_limit);
- ARRAY_PUT(p->dictionary, pd->splitPosition, lo);
+ ARRAY_PUT(pd, pd->splitPosition, lo);
}
}
}
}
- ARRAY_PUT(p->dictionary, (pd->splitPosition + pd->homeSize), NIL);
+ ARRAY_PUT(pd, (pd->splitPosition + pd->homeSize), NIL);
}
if (HASH_RANGE(p->dictionary) <= (p->dictionary->size / 4)) {
array_shrink(&(p->dictionary), (HASH_RANGE(p->dictionary) * 3) / 2);
@@ -860,7 +864,8 @@ static void grow(Process *p)
for (i = 0; i < steps; ++i) {
if (pd->splitPosition == pd->homeSize) {
pd->homeSize *= 2;
- pd->splitPosition = 0;
+ pd->sizeMask = pd->homeSize*2 - 1;
+ pd->splitPosition = 0;
}
pos = pd->splitPosition;
++pd->splitPosition; /* For the hashes */
@@ -934,7 +939,6 @@ static void ensure_array_size(ProcDict **ppdict, unsigned int size)
for (i = 0; i < siz; ++i)
pd->data[i] = NIL;
pd->size = siz;
- pd->homeSize = pd->splitPosition = pd->numElements = 0;
*ppdict = pd;
} else if (size > pd->size) {
Uint osize = pd->size;
@@ -959,9 +963,9 @@ static unsigned int pd_hash_value_to_ix(ProcDict *pdict, Uint32 hx)
ASSERT(IS_POW2(pdict->homeSize));
- high = hx & (pdict->homeSize*2 - 1);
+ high = hx & pdict->sizeMask;
if (high >= HASH_RANGE(pdict))
- return hx & (pdict->homeSize - 1);
+ return hx & (pdict->sizeMask >> 1);
return high;
}
diff --git a/erts/emulator/beam/erl_process_dict.h b/erts/emulator/beam/erl_process_dict.h
index eb26a1ffcc..fd59c969cf 100644
--- a/erts/emulator/beam/erl_process_dict.h
+++ b/erts/emulator/beam/erl_process_dict.h
@@ -23,6 +23,7 @@
#include "sys.h"
typedef struct proc_dict {
+ unsigned int sizeMask;
unsigned int size;
unsigned int homeSize;
unsigned int splitPosition;