check if the pool has a free connection

Hi, I am trying to optimise the size of the connection pool ( I know its a much broader topic).
I've been playing around with setting a really low timeout, and looping while counting the timeouts (this is also meaningful only in the long running mean) .

My app has no use for persistent connections/transactions and a pool is used to allow for a higher throughput and every "fetch" is called on the pool instance.

any low hanging fruits here or should I try to rebuilding the library with some tracing on the acquire context?

该 issue 没有指出文件、测试或具体的入口点。首先明确是否要求检查池的可用性，以及对于 fetch 调用和超时计数方法，“空闲连接”和“完成”分别是什么意思。