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innodb_buffer_pool_size_auto_min: A minimum innodb_buffer_pool_size that a Linux memory pressure event can lead to shrinking the buffer pool to. On a memory pressure event, we will attempt to shrink innodb_buffer_pool_size halfway between its current value and innodb_buffer_pool_size_auto_min. If innodb_buffer_pool_size_auto_min is specified as 0 or not specified on startup, its default value will be adjusted to innodb_buffer_pool_size_max, that is, memory pressure events will be disregarded by default. buf_pool_t::garbage_collect(): For up to 15 seconds, attempt to shrink the buffer pool in response to a memory pressure event. Reviewed by: Debarun Banerjee
37 lines
1.7 KiB
Text
37 lines
1.7 KiB
Text
#
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# MDEV-24670 avoid OOM by linux kernel co-operative memory management
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#
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set @save_dbug=@@debug_dbug;
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set @save_limit=@@GLOBAL.innodb_limit_optimistic_insert_debug;
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set GLOBAL innodb_max_purge_lag_wait=0;
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SET @innodb_buffer_pool_size= @@GLOBAL.innodb_buffer_pool_size;
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SET @innodb_buffer_pool_size_min= @@GLOBAL.innodb_buffer_pool_size_auto_min;
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SELECT
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@@GLOBAL.innodb_buffer_pool_size,
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@@GLOBAL.innodb_buffer_pool_size_auto_min,
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@@GLOBAL.innodb_buffer_pool_size_max;
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@@GLOBAL.innodb_buffer_pool_size @@GLOBAL.innodb_buffer_pool_size_auto_min @@GLOBAL.innodb_buffer_pool_size_max
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17825792 16777216 25165824
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CREATE TABLE t1 (a INT PRIMARY KEY) ENGINE=InnoDB;
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SET GLOBAL innodb_limit_optimistic_insert_debug=2;
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SET STATEMENT unique_checks=0, foreign_key_checks=0 FOR
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INSERT INTO t1 SELECT * FROM seq_1_to_1000;
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SET GLOBAL innodb_limit_optimistic_insert_debug=@save_limit;
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DROP TABLE t1;
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SET STATEMENT debug_dbug="d,trigger_garbage_collection" FOR
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SET GLOBAL innodb_buffer_pool_size=@innodb_buffer_pool_size;
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FOUND 1 /Memory pressure event disregarded.*/ in mysqld.1.err
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SET STATEMENT debug_dbug="d,trigger_garbage_collection" FOR
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SET GLOBAL innodb_buffer_pool_size_auto_min=
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CAST(@innodb_buffer_pool_size/2 AS UNSIGNED),
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innodb_buffer_pool_size=@innodb_buffer_pool_size;
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Warnings:
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Warning 1292 Truncated incorrect innodb_buffer_pool_size_auto_min value: '8912896'
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select @@global.innodb_buffer_pool_size < @innodb_buffer_pool_size;
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@@global.innodb_buffer_pool_size < @innodb_buffer_pool_size
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1
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FOUND 1 /InnoDB: Memory pressure event shrunk.*/ in mysqld.1.err
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set debug_dbug=@save_dbug;
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SET GLOBAL innodb_buffer_pool_size= @innodb_buffer_pool_size;
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SET GLOBAL innodb_buffer_pool_size_auto_min=@innodb_buffer_pool_size_min;
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# End of 10.11 tests
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