nginx-大并发压力测试数据，求大神指导
nginxphp并发
首先感谢各位！
直观点线上测试数据
测试数据如下
webbench 5000并发60秒 访问txt文件
webbench 30000并发60秒 访问txt文件
webbench 2000并发60秒 访问php文件 只写了个phpinfo（）
webbench 10000并发60秒 访问php文件 只写了个phpinfo（）
webbench 10000并发60秒 top结果
测试环境
cpu16核 内存64G
系统CentOS-6.5 64位
nginx/1.0.13
php5.6.7
以下问题求大神指点
1.不考虑程序性能的情况下，在这套系统内，是否还有更大的优化空间，极限能达到什么程度，如何调整？
2.在10000并发访问php的时候，服务器负载也不是很高，ssd硬盘没raid，瓶颈在哪呢？
下面附上部分配置参数
php-fpm.conf
sysctl.conf
nginx.conf
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