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New result block allocation strategy

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mysql-test/r/query_cache.result:
  Test changed according with new block sizes
mysql-test/t/query_cache.test:
  Test changed according with new block sizes
This commit is contained in:
unknown
2002-01-12 15:40:52 +02:00
parent 87ec555947
commit 985763d649
4 changed files with 85 additions and 48 deletions
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20
sql/sql_cache.h
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@ -25,14 +25,22 @@
if QUERY_CACHE_MIN_ALLOCATION_UNIT == 0 then
QUERY_CACHE_MIN_ALLOCATION_UNIT choosed automaticaly
*/
#define QUERY_CACHE_MIN_ALLOCATION_UNIT 0
#define QUERY_CACHE_MIN_ALLOCATION_UNIT 512
/* inittial size of hashes */
#define QUERY_CACHE_DEF_QUERY_HASH_SIZE 1024
#define QUERY_CACHE_DEF_TABLE_HASH_SIZE 1024
/* minimal result data size when data allocated */
#define QUERY_CACHE_MIN_RESULT_DATA_SIZE 1024
#define QUERY_CACHE_MIN_RESULT_DATA_SIZE 1024*4
/*
start estimation of first result block size only when number of queries
bigger then:
*/
#define QUERY_CACHE_MIN_ESTIMATED_QUERIES_NUMBER 3
/* memory bins size spacing (see at Query_cache::init_cache (sql_cache.cc)) */
#define QUERY_CACHE_MEM_BIN_FIRST_STEP_PWR2 4
@ -234,8 +242,7 @@ protected:
query structure we locked an internal query block mutex.
LOCK SEQUENCE (to prevent deadlocks):
1. structure_guard_mutex
2. query block / table block / free block
3. results blocks (only when must become free).
2. query block (for operation inside query (query block/results))
*/
pthread_mutex_t structure_guard_mutex;
byte *cache; // cache memory
@ -271,7 +278,8 @@ protected:
void free_query(Query_cache_block *point);
my_bool allocate_data_chain(Query_cache_block **result_block,
ulong data_len,
Query_cache_block *query_block);
Query_cache_block *query_block,
my_bool first_block);
void invalidate_table(TABLE_LIST *table);
void invalidate_table(TABLE *table);
void invalidate_table(Query_cache_block *table_block);
@ -328,6 +336,8 @@ protected:
Query_cache_block *parent,
Query_cache_block::block_type
type=Query_cache_block::RESULT);
inline ulong get_min_first_result_data_size();
inline ulong get_min_append_result_data_size();
Query_cache_block *allocate_block(ulong len, my_bool not_less,
ulong min,
my_bool under_guard=0);