What is PHP high concurrency? The problem of high concurrency is often encountered in the development and deployment of applications, when with the traffic becomes larger, it will encounter a variety of technical problems, such as interface response timeout, elevated CPU load, frequent GC, deadlocks, large data volume storage and so on. For example: Taobao's double 11, hundreds of thousands of requests per second spike system, ten million orders a day system, a hundred million daily activity of the information flow system and so on. High concurrency processing process: First, performance testing Understand the performance of the test system under high load, to find potential bottlenecks and ...