Introduced in Apache 1.3.21 and in Apache 2.0, the AcceptMutex directive reveals a significant opportunity for performance tuning. This directive allows configuration at runtime of how Apache will tune accept() handling. On some systems with only a single listener, accept locking is not required. This strategy is called Single Listen Unserialized Accept. However, for those configurations that have multiple listeners or operating systems that have a thundering herd on the accept system call (no matter the number of listeners), the accept routines must be serialized.
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