一天两万个请求确实不大，但如果在高峰时期出现，而晚间或其它时间没有，呈正态分布，且均是需要时间的下载服务，那负载还是很大的。 

Apache允许为请求开的最大进程数是256，MaxClients的限制是256.如果用户多了，用户就只能看到Waiting for reply....然后等到下一个可用进程的出现。这个最大数，是Apache的程序决定的--它的NT版可以有1024，但Unix版只有256，你可以在src/include/httpd.h中 
看到： 
#ifndef HARD_SERVER_LIMIT 
#ifdef WIN32 
#define HARD_SERVER_LIMIT 1024 
#else 
#define HARD_SERVER_LIMIT 256 
#endif 
#endif 
你可以把它调到1024，然后再编译你的系统。记得在httpd.conf里也 
要更改相应配置，缺省好象是150。就下面的机器来说，调到512顶 
死了，如果再高，系统受不了。 

另外，一些系统也限制了一个用户的最大进程数。你可以用ulimit -u 
来看。Linux一般是256。因此你要真想让Apache超过这个数，就得调整 
这个参数： 
ulimit -u unlimited 
这个参数要在Apache运行之前修改，因此建议加到apachectl里： 
case $ARG in 
start) 
if [ $RUNNING -eq 1 ]; then 
echo "$0 $ARG: httpd (pid $PID) already running" 
continue 
改成 
case $ARG in 
start) 
ulimit -u unlimited 
if [ $RUNNING -eq 1 ]; then 
echo "$0 $ARG: httpd (pid $PID) already running" 
continue  

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