The most ideal settings are those that don't leave any useless memory fragment behind...

An example for systems with 16GB (16,384MB) of RAM:

(16,384 ÷ 2) = {8,192 mm_pool_size}
({8,192 mm_pool_size} ÷ {1,000 mm_max_tmp_buffers_size}) = 8.192
not so good! let's try again...
(16,000 ÷ 2) = {8,000 mm_pool_size}
({8,000 mm_pool_size} ÷ {1,000 mm_max_tmp_buffers_size}) = 8
that's it!
we need at least {30 mm_max_resource_size} for our performance expectations, so;
({1,000 mm_max_tmp_buffers_size} ÷ {30 mm_max_resource_size}) = 33.33∞
that's not good either, keep trying...
({1,000 mm_max_tmp_buffers_size} / {40 mm_max_resource_size}) = 25
voilà!
Command line with result:

-mm_pool_size 8000 -mm_max_resource_size 40 -mm_max_tmp_buffers_size 1000

更多讨论参考scs论坛：https://forum.scssoft.com/viewtopic.php?t=261451