we use pdo connection on php game , that based on multi threading using mutex lock .
our issue is that when we have 2 or more threads at one time , then the system delays the second thread till the first one finish , which makes a lot pressure on cpu and destroy game. structure
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Need to see the code. From first look it seems the connection pooling is not used correctly or not at all, also might be a issue with wrong update usage or db config.