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c216c9f0f0
To allow it, change minimum of thread_pool_stall_limit to be 10 milliseconds. Also introduce a new parameter to oversubscribe a group . Number of threads running in parallel would be higher than it normally should, leading to thrashing, but it may improving preemptiveness, which is useful for the described corner case.
48 lines
2.0 KiB
Plaintext
48 lines
2.0 KiB
Plaintext
SET @start_global_value = @@global.thread_pool_oversubscribe;
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select @@global.thread_pool_oversubscribe;
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@@global.thread_pool_oversubscribe
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3
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select @@session.thread_pool_oversubscribe;
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ERROR HY000: Variable 'thread_pool_oversubscribe' is a GLOBAL variable
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show global variables like 'thread_pool_oversubscribe';
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Variable_name Value
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thread_pool_oversubscribe 3
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show session variables like 'thread_pool_oversubscribe';
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Variable_name Value
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thread_pool_oversubscribe 3
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select * from information_schema.global_variables where variable_name='thread_pool_oversubscribe';
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VARIABLE_NAME VARIABLE_VALUE
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THREAD_POOL_OVERSUBSCRIBE 3
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select * from information_schema.session_variables where variable_name='thread_pool_oversubscribe';
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VARIABLE_NAME VARIABLE_VALUE
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THREAD_POOL_OVERSUBSCRIBE 3
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set global thread_pool_oversubscribe=60;
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select @@global.thread_pool_oversubscribe;
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@@global.thread_pool_oversubscribe
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60
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set global thread_pool_oversubscribe=1000;
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select @@global.thread_pool_oversubscribe;
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@@global.thread_pool_oversubscribe
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1000
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set session thread_pool_oversubscribe=1;
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ERROR HY000: Variable 'thread_pool_oversubscribe' is a GLOBAL variable and should be set with SET GLOBAL
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set global thread_pool_oversubscribe=1.1;
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ERROR 42000: Incorrect argument type to variable 'thread_pool_oversubscribe'
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set global thread_pool_oversubscribe=1e1;
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ERROR 42000: Incorrect argument type to variable 'thread_pool_oversubscribe'
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set global thread_pool_oversubscribe="foo";
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ERROR 42000: Incorrect argument type to variable 'thread_pool_oversubscribe'
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set global thread_pool_oversubscribe=-1;
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Warnings:
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Warning 1292 Truncated incorrect thread_pool_oversubscribe value: '-1'
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select @@global.thread_pool_oversubscribe;
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@@global.thread_pool_oversubscribe
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1
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set global thread_pool_oversubscribe=10000000000;
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Warnings:
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Warning 1292 Truncated incorrect thread_pool_oversubscribe value: '10000000000'
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select @@global.thread_pool_oversubscribe;
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@@global.thread_pool_oversubscribe
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1000
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set @@global.thread_pool_oversubscribe = @start_global_value;
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