Such as topic, when using the default configuration apache test of concurrency is 10000-10000 - c n no time limit, then modify the event mode after all the parameters (such as simultaneous connections have increased a lot, also set ServerLimit at the same time, the values of other parameters are in reasonable range, restart the apache way is stop and then start), and also tests the concurrency is 10000-10000 - c n no time limit, the result is similar to the default configuration, even worse, don't understand why configuration didn't have the corresponding effect, have a great spirit experience of concurrent apache configuration and can be through the ab test shows its effect? Hope to share!