我有一个非常繁忙的服务器：PHP (Wordpress) 使用 W3TotalCache APC、Varnish for Apache 和 Cloudflare 来处理所有流量。
Ubuntu 14.04.4 LTS
只有一个网站平均每天点击量约为 6 万次。
我时不时地收到这条消息，一天几次。与暂时的流量峰值无关，我们将时间与 Google Analytics 进行了比较。
Thu Apr 28 14:14:42.938075 2016] [mpm_prefork:error] [pid 19137] AH00161: server reached MaxRequestWorkers setting, consider raising the MaxRequestWorkers setting
[Thu Apr 28 15:43:25.594147 2016] [core:notice] [pid 19137] AH00051: child pid 19866 exit signal Segmentation fault (11), possible coredump in /etc/apache2
[Thu Apr 28 15:43:25.594313 2016] [core:notice] [pid 19137] AH00051: child pid 20386 exit signal Segmentation fault (11), possible coredump in /etc/apache2
[Thu Apr 28 15:43:25.594407 2016] [core:notice] [pid 19137] AH00051: child pid 19143 exit signal Segmentation fault (11), possible coredump in /etc/apache2
[Thu Apr 28 15:43:25.594498 2016] [core:notice] [pid 19137] AH00051: child pid 19144 exit signal Segmentation fault (11), possible coredump in /etc/apache2
[Thu Apr 28 15:43:25.594572 2016] [core:notice] [pid 19137] AH00051: child pid 20597 exit signal Segmentation fault (11), possible coredump in /etc/apache2
[Thu Apr 28 15:43:25.594642 2016] [core:notice] [pid 19137] AH00051: child pid 20395 exit signal Segmentation fault (11), possible coredump in /etc/apache2
[Thu Apr 28 15:43:25.594704 2016] [core:notice] [pid 19137] AH00051: child pid 20424 exit signal Segmentation fault (11), possible coredump in /etc/apache2
[Thu Apr 28 15:43:25.594785 2016] [core:notice] [pid 19137] AH00051: child pid 20598 exit signal Segmentation fault (11), possible coredump in /etc/apache2
[Thu Apr 28 15:43:25.594870 2016] [core:notice] [pid 19137] AH00051: child pid 19861 exit signal Segmentation fault (11), possible coredump in /etc/apache2
[Thu Apr 28 15:43:25.594957 2016] [core:notice] [pid 19137] AH00051: child pid 19782 exit signal Segmentation fault (11), possible coredump in /etc/apache2
....
....
因此，我首先将 MaxRequestWorkers 增加到 100，然后增加到 500，现在增加到 1024。但仍在发生。
这是我目前的 apache2.conf 。
代码：
<IfModule mpm_worker_module>
StartServers 256
MinSpareThreads 256
MaxSpareThreads 256
MaxClients 256
ServerLimit 256
ThreadLimit 256
ThreadsPerChild 256
MaxRequestWorkers 1024
MaxConnectionsPerChild 0
MaxRequestPerChild 1000
</IfModule>
有大量可用 RAM，平均负载约为 0.5，有时超过 1。但从未见过它高于 2。因此服务器似乎可以正常处理流量。
top - 16:07:47 up 3 days, 18:18, 2 users, load average: 0.57, 0.46, 0.55
Tasks: 113 total, 1 running, 112 sleeping, 0 stopped, 0 zombie
%Cpu(s): 10.5 us, 2.0 sy, 0.0 ni, 87.4 id, 0.1 wa, 0.0 hi, 0.0 si, 0.0 st
KiB Mem: 8176816 total, 2372560 used, 5804256 free, 189684 buffers
KiB Swap: 0 total, 0 used, 0 free. 1286692 cached Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
21930 www-data 20 0 337212 83308 60072 S 24.9 1.0 0:52.89 apache2
21945 www-data 20 0 327640 72684 58816 S 24.3 0.9 0:48.37 apache2
1182 nobody 20 0 702868 442268 83496 S 0.7 5.4 42:41.32 varnishd
有什么想法 Apache 会中断吗？
//j
