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I think the setting of thread_pool_size = 500 has been installed at my site with the wrong understanding of its application.

Our host server has only 40 CPUs.
Isn't this setting going to be counter-productive?

However, it looks to me like we might benefit from setting it slightly higher than our CPU count.

Am I correct in thinking that we should not set it (much) higher than our CPU count, and never higher than 128, the limit posed in the manual?

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Yes, it is going to be counterproductive. You can set it slightly higher than CPU count, maybe 2*CPU count, but not 12.5*CPU count. You do not want 500 connection to execute at the same time, CPU-bound. you only want to use as many CPUs as you got.

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