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branches/zip: Make innodb_thread_concurrency=0 the default.

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The old default was 8.
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marko
2009-02-11 22:14:19 +00:00
parent e84b9b26d6
commit b6beea92c4
3 changed files with 10 additions and 2 deletions
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8
ChangeLog
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@ -1,3 +1,11 @@
2009-02-11 The InnoDB Team
* handler/ha_innodb.cc:
Make innodb_thread_concurrency=0 the default. The old default
value was 8. A non-zero setting may be useful when InnoDB is
showing severe scalability problems under multiple concurrent
connections.
2009-02-10 The InnoDB Team 2009-02-10 The InnoDB Team
* handler/ha_innodb.h, handler/ha_innodb.cc: * handler/ha_innodb.h, handler/ha_innodb.cc:

2
handler/ha_innodb.cc
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@ -9682,7 +9682,7 @@ static MYSQL_SYSVAR_ULONG(sync_spin_loops, srv_n_spin_wait_rounds,
static MYSQL_SYSVAR_ULONG(thread_concurrency, srv_thread_concurrency, static MYSQL_SYSVAR_ULONG(thread_concurrency, srv_thread_concurrency,
PLUGIN_VAR_RQCMDARG, PLUGIN_VAR_RQCMDARG,
"Helps in performance tuning in heavily concurrent environments. Sets the maximum number of threads allowed inside InnoDB. Value 0 will disable the thread throttling.", "Helps in performance tuning in heavily concurrent environments. Sets the maximum number of threads allowed inside InnoDB. Value 0 will disable the thread throttling.",
NULL, NULL, 8, 0, 1000, 0); NULL, NULL, 0, 0, 1000, 0);
static MYSQL_SYSVAR_ULONG(thread_sleep_delay, srv_thread_sleep_delay, static MYSQL_SYSVAR_ULONG(thread_sleep_delay, srv_thread_sleep_delay,
PLUGIN_VAR_RQCMDARG, PLUGIN_VAR_RQCMDARG,

2
mysql-test/innodb.result
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@ -1783,7 +1783,7 @@ Variable_name Value
innodb_sync_spin_loops 20 innodb_sync_spin_loops 20
show variables like "innodb_thread_concurrency"; show variables like "innodb_thread_concurrency";
Variable_name Value Variable_name Value
innodb_thread_concurrency 8 innodb_thread_concurrency 0
set global innodb_thread_concurrency=1001; set global innodb_thread_concurrency=1001;
Warnings: Warnings:
Warning 1292 Truncated incorrect thread_concurrency value: '1001' Warning 1292 Truncated incorrect thread_concurrency value: '1001'