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InnoDB: Disable throttling against thread thrashing by default.

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sql/ha_innodb.cc:
  Remove unused variable innobase_thread_concurrency.
  Add UNIV_LIKELY hints to srv_thread_concurrency tests
  and lower the limit from 500 to 20.
sql/ha_innodb.h:
  Remove unused variable innobase_thread_concurrency.
sql/mysqld.cc:
  Make innodb_thread_concurrency=20 by default (it was 8).
This commit is contained in:
unknown
2005-05-03 15:55:53 +03:00
parent bcd031271f
commit 807a543b8b
3 changed files with 5 additions and 6 deletions
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7
sql/ha_innodb.cc
View File

@@ -98,8 +98,7 @@ long innobase_mirrored_log_groups, innobase_log_files_in_group,
innobase_buffer_pool_awe_mem_mb,
innobase_buffer_pool_size, innobase_additional_mem_pool_size,
innobase_file_io_threads, innobase_lock_wait_timeout,
innobase_thread_concurrency, innobase_force_recovery,
innobase_open_files;
innobase_force_recovery, innobase_open_files;
/* The default values for the following char* start-up parameters
are determined in innobase_init below: */
@@ -279,7 +278,7 @@ innodb_srv_conc_enter_innodb(
/*=========================*/
trx_t* trx) /* in: transaction handle */
{
if (srv_thread_concurrency >= 500) {
if (UNIV_LIKELY(srv_thread_concurrency >= 20)) {
return;
}
@@ -296,7 +295,7 @@ innodb_srv_conc_exit_innodb(
/*========================*/
trx_t* trx) /* in: transaction handle */
{
if (srv_thread_concurrency >= 500) {
if (UNIV_LIKELY(srv_thread_concurrency >= 20)) {
return;
}

2
sql/ha_innodb.h
View File

@@ -219,7 +219,7 @@ extern long innobase_log_file_size, innobase_log_buffer_size;
extern long innobase_buffer_pool_size, innobase_additional_mem_pool_size;
extern long innobase_buffer_pool_awe_mem_mb;
extern long innobase_file_io_threads, innobase_lock_wait_timeout;
extern long innobase_force_recovery, innobase_thread_concurrency;
extern long innobase_force_recovery;
extern long innobase_open_files;
extern char *innobase_data_home_dir, *innobase_data_file_path;
extern char *innobase_log_group_home_dir, *innobase_log_arch_dir;

2
sql/mysqld.cc
View File

@@ -5170,7 +5170,7 @@ log and this option does nothing anymore.",
{"innodb_thread_concurrency", OPT_INNODB_THREAD_CONCURRENCY,
"Helps in performance tuning in heavily concurrent environments.",
(gptr*) &srv_thread_concurrency, (gptr*) &srv_thread_concurrency,
0, GET_LONG, REQUIRED_ARG, 8, 1, 1000, 0, 1, 0},
0, GET_LONG, REQUIRED_ARG, 20, 1, 1000, 0, 1, 0},
{"innodb_thread_sleep_delay", OPT_INNODB_THREAD_SLEEP_DELAY,
"Time of innodb thread sleeping before joining InnoDB queue (usec). Value 0"
" disable a sleep",