我的 PHP-FPM 上有以下设置：
pm.max_children = 256
pm.start_servers = 50
pm.min_spare_servers = 40
pm.max_spare_servers = 128
即使我将其设置为更高的值，仍然会出现以下错误：
[13-Dec-2013 11:58:55] WARNING: [pool web2] seems busy (you may need to increase pm.start_servers, or pm.min/max_spare_servers), spawning 8 children, there are 36 idle, and 58 total children
[13-Dec-2013 11:58:56] WARNING: [pool web2] seems busy (you may need to increase pm.start_servers, or pm.min/max_spare_servers), spawning 16 children, there are 32 idle, and 62 total children
[13-Dec-2013 11:59:12] WARNING: [pool web2] seems busy (you may need to increase pm.start_servers, or pm.min/max_spare_servers), spawning 8 children, there are 26 idle, and 77 total children
[13-Dec-2013 11:59:13] WARNING: [pool web2] seems busy (you may need to increase pm.start_servers, or pm.min/max_spare_servers), spawning 16 children, there are 27 idle, and 85 total children
我创建了一个脚本，当pm.max_spare_servers达到 90 时，它将重新加载 php5-fpm。但是，有时，在重新加载 php5-fpm 服务之前，它已经达到了最大备用服务器，因为我仅每 15 分钟运行一次 cron 来检查该值。
start_servers所以我的问题是，如果我将其设置为最低值而不是更高值，会有什么区别。
说类似这样的话：
pm.max_children = 256
pm.start_servers = 10
pm.min_spare_servers = 5
pm.max_spare_servers = 128
顺便说一句，我正在使用 nginx 和 ubuntu 12.04。