"=?ISO-8859-1?B?dGVycnk=?=" <94487...@qq.com> writes:
> STACK_DEPTH_SLOP stands for Required daylight between max_stack_depth and the 
> kernel limit, in bytes. 
> Why we need so much memory? MySql need only no more than 100K. Where these 
> memory allocated for? 

That's not memory, that's just address space.  Cutting it will not
really buy you anything; it'll just increase your risk of stack-overflow
crashes.

                        regards, tom lane

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