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apache,Process exiting because it reached MaxRequestsPerChild. Signaling the par

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Apache

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使用redmine之后，查看apache的日志发现大量的一下提示log

[Mon Apr 16 15:40:19 2012] [notice] Child 7584: Process exiting because it reached MaxRequestsPerChild. Signaling the parent to restart a new child process.
[Mon Apr 16 15:40:19 2012] [notice] Parent: Received restart signal -- Restarting the server.

查了一下原因：

apache在windows下使用mpm模块，这个模块有2个参数，其中一个

　　MaxRequestsPerChild

　　该参数表示每个子进程能够处理的最大请求数, 即同时间内子进程数目.设置为零表示不限制, mpm_winnt上的默认值就是0.

　　官方参考手册中不建议设置为0, 主要基于两点考虑: (1) 可以防止(偶然的)内存泄漏无限进行，从而耗尽内存; (2) 给进程一个有限寿命，从而有助于当服务器负载减轻的时候减少活动进程的数量。

　　因此这个参数的值更大程度上取决于服务器的内存，如果内存比较大的话可以设置为0或很大的数字，否则设置一个小的数值。需要说明的是，如果这个值设置的太小的话会造成Apache频繁重启，在日志文件中会看到如下的文字：

　　Process exiting because it reached MaxRequestsPerChild. Signaling the parent

目前修改了此参数，观察是否有后续问题

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2012-04-16 15:56
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