之前，头一次在Windows Server安装这样的环境，系统运行不久后，就经常发生httpd.exe 的Memory Leak. 在网上找了很久，这个问题终于解决了，httpd.conf配置如下：
<IfModule mpm_winnt.c> Win32DisableAcceptEx ThreadsPerChild 100 MaxRequestsPerChild 1000 MaxMemFree 16 ThreadLimit 100 ThreadStackSize 8192 KeepAliveTimeout 2 MaxKeepAliveRequests 10 </IfModule>
如此设置成功后，不要使用“restart", 因为使用restart的话，Apache只会停掉child thread, 再将老的parent thread复制后，生成一个新的child thread. 也就是说：你的threads设置没有生效。解决的办法是：Stop Sevice(别太心疼停服务)，然后再Start Service。这样，parent tread就是一个新的进程号了，如果你不相信，可以在stop前、后，使用如下命令测试：
tasklist /FI "imagename eq httpd.exe"
当设置生效后，你就会从error.log中看到如下内容：
[Thu May 19 22:47:13 2012] [notice] Apache/2.2.4 (Win32) configured -- resuming normal operations
[Thu May 19 22:47:13 2012] [notice] Server built: Jan 9 2007 23:17:20
[Thu May 19 22:47:13 2012] [notice] Parent: Created child process 3752
[Thu May 19 22:47:13 2012] [notice] Disabled use of AcceptEx() WinSock2 API
[Thu May 19 22:47:13 2012] [notice] Child 3752: Child process is running
[Thu May 19 22:47:13 2012] [notice] Child 3752: Acquired the start mutex.
[Thu May 19 22:47:13 2012] [notice] Child 3752: Starting 100 worker threads.
[Thu May 19 22:47:13 2012] [notice] Child 3752: Listening on port 80.
[Thu May 19 22:48:00 2012] [error] [client 222.178.216.188] Invalid URI in request Connection: Keep-Alive
[Thu May 19 22:49:54 2012] [notice] Child 3752: Process exiting because it reached MaxRequestsPerChild. Signaling the parent to restart a new child process.
[Thu May 19 22:49:54 2012] [notice] Parent: Received restart signal -- Restarting the server.
[Thu May 19 22:49:54 2012] [notice] Apache/2.2.4 (Win32) configured -- resuming normal operations
[Thu May 19 22:49:54 2012] [notice] Server built: Jan 9 2007 23:17:20
[Thu May 19 22:49:54 2012] [notice] Parent: Created child process 1756
[Thu May 19 22:49:54 2012] [notice] Disabled use of AcceptEx() WinSock2 API
[Thu May 19 22:49:54 2012] [notice] Child 1756: Child process is running
[Thu May 19 22:49:55 2012] [notice] Child 3752: Released the start mutex
[Thu May 19 22:49:55 2012] [notice] Child 1756: Acquired the start mutex.
[Thu May 19 22:49:55 2012] [notice] Child 1756: Starting 100 worker threads.
[Thu May 19 22:49:55 2012] [notice] Child 3752: Waiting for 100 worker threads to exit.
[Thu May 19 22:49:55 2012] [notice] Child 1756: Listening on port 80.
[Thu May 19 22:50:03 2012] [notice] Child 3752: All worker threads have exited.
[Thu May 19 22:50:03 2012] [notice] Child 3752: Child process is exiting
注意：
当达到MaxRequestsPerChild时，apache的parent thread会启动一个新的child thread，这时你的系统中会停有3个httpd.exe进程，直到上一个进程的所有child thread都结速后，进程才会退出。
另外，上面的error log级别是：LogLevel warn
