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据说服务器运行TOMCAT+JDK环境能负载到动态1W的并发，贴上他的配置，以后有机会在测试！

java 环境配置：

export JAVA_OPTS="-server -Xms8g -Xmx8g -Xss128k -XX:ParallelGCThreads=20 -XX:+UseConcMarkSweepGC -XX:+UseParNewGC -XX:SurvivorRatio=8 -XX:TargetSurvivorRatio=90 -XX:MaxTenuringThreshold=31"

sysctl.conf的配置：

net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_max_tw_buckets = 180000
net.ipv4.tcp_sack = 1
net.ipv4.tcp_window_scaling = 1
net.ipv4.tcp_rmem = 4096        87380   4194304
net.ipv4.tcp_wmem = 4096        16384   4194304

net.ipv4.tcp_max_syn_backlog = 65536
net.core.netdev_max_backlog = 32768
net.core.somaxconn = 327680

net.core.wmem_default = 8388608
net.core.rmem_default = 8388608
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216

net.ipv4.tcp_timestamps = 0
net.ipv4.tcp_synack_retries = 2
net.ipv4.tcp_syn_retries = 2
net.ipv4.tcp_fin_timeout = 30

net.ipv4.tcp_tw_recycle = 1
#net.ipv4.tcp_tw_len = 1
net.ipv4.ip_local_port_range = 1024 650000
net.ipv4.tcp_keepalive_time = 5


net.ipv4.tcp_keepalive_probes=2
net.ipv4.tcp_keepalive_intvl=2


net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_tw_recyle = 1
net.ipv4.tcp_max_syn_backlog=8192
net.ipv4.tcp_no_metrics_save = 0

net.ipv4.tcp_mem = 94500000 915000000 927000000
net.ipv4.tcp_max_orphans = 3276800

fs.file-max = 9553600

net.ipv4.netfilter.ip_conntrack_max = 655360
net.ipv4.netfilter.ip_conntrack_tcp_timeout_established = 60


net.ipv4.tcp_max_tw_buckets = 60000
net.ipv4.conf.lo.arp_ignore = 1
net.ipv4.conf.lo.arp_announce = 2
net.ipv4.conf.all.arp_ignore = 1
net.ipv4.conf.all.arp_announce = 2

tomcat的SERVER.XML配置：

server.conf 配置

<Connector port="8188" protocol="HTTP/1.1"
               maxThreads="30000"
               minSpareThreads="512"
               maxSpareThreads="2048"
               enableLookups="false"
               redirectPort="8443" acceptCount="35000"
               debug="0"
               connectionTimeout="40000"
               disableUploadTimeout="true"
                URIEncoding="UTF-8" />

参数说明： 

connectionTimeout - 网络连接超时，单位：毫秒。设置为0表示永不超时，这样设置有隐患的。通常可设置为30000毫秒。 
keepAliveTimeout - 长连接最大保持时间（毫秒）。此处为15秒。 
maxKeepAliveRequests - 最大长连接个数（1表示禁用，-1表示不限制个数，默认100个。一般设置在100~200之间）  
maxHttpHeaderSize - http请求头信息的最大程度，超过此长度的部分不予处理。一般8K。 
URIEncoding - 指定Tomcat容器的URL编码格式。 
acceptCount - 指定当所有可以使用的处理请求的线程数都被使用时，可以放到处理队列中的请求数，超过这个数的请求将不予处理，默认为10个。

disableUploadTimeout - 上传时是否使用超时机制 
enableLookups - 是否反查域名，取值为：true或false。为了提高处理能力，应设置为false 
bufferSize - defines the size (in bytes) of the buffer to be provided for input streams created by this connector. By default, buffers of 2048 bytes are provided. 
maxSpareThreads - 最大空闲连接数，一旦创建的线程超过这个值，Tomcat就会关闭不再需要的socket线程 The default value is 50. 
maxThreads - 最多同时处理的连接数，Tomcat使用线程来处理接收的每个请求。这个值表示Tomcat可创建的最大的线程数。 minSpareThreads - 最小空闲线程数，Tomcat初始化时创建的线程数 . 
minProcessors - 最小空闲连接线程数，用于提高系统处理性能，默认值为10。
maxProcessors - 最大连接线程数，即：并发处理的最大请求数，默认值为75。

修改启动时内存参数

window下， 在catalina.bat最前面： 
set JAVA_OPTS=-XX:PermSize=64M -XX:MaxPermSize=128m -Xms512m -Xmx1024m 
一定加在catalina.bat最前面。

linux下，在catalina.sh最前面增加： 
JAVA_OPTS="-XX:PermSize=64M -XX:MaxPermSize=128m -Xms512m -Xmx1024m -Duser.timezone=Asia/Shanghai"

注意：前后二者区别，有无set，有无双引号。

写Socket做测试

以下是Groovy代码

content ='''GET /index.jsp HTTP/1.1
Accept-Language: zh-cn
Connection: Keep-Alive
Host: 192.168.0.53
Content-Length: 36

'''
def sleepTime=1000
Socket socket = new Socket('localhost',8080)

println 'is keep alive? ' + socket.getKeepAlive()

println 'sleep ' + sleepTime + ' ms.'
Thread.sleep(sleepTime)
println 'is closed? ' + socket.isClosed()

println 'sleep ' + sleepTime + ' ms.'
//Thread.sleep(sleepTime)

println 'write socket begin======'
writeStream(content, socket.getOutputStream())

println 'read socket begin======'
println readStream(socket.getInputStream())[0..300]

void writeStream(content, stream) {
         OutputStream buf = new BufferedOutputStream(stream);
         OutputStreamWriter out = new OutputStreamWriter(buf, "UTF-8");
         out.write(content)
         out.flush();
         print content
        //out.close();
}

String readStream(stream){
        String sResult=''
        byte[] buffer = new byte[1024];

        int readCount = stream.read(buffer);

        while (readCount != -1) {
            sResult += new String(buffer, 0,
            readCount, "utf-8");
           readCount = stream.read(buffer);
       }
      stream.close()
      return sResult
}