以下內(nèi)容來源于互聯(lián)網(wǎng)，具體出處不詳

據(jù)說服務(wù)器運(yùn)行TOMCAT+JDK環(huán)境能負(fù)載到動(dòng)態(tài)1W的并發(fā)，貼上他的配置，以后有機(jī)會(huì)在測試！

java 環(huán)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" />

參數(shù)說明：

connectionTimeout - 網(wǎng)絡(luò)連接超時(shí)，單位：毫秒。設(shè)置為0表示永不超時(shí)，這樣設(shè)置有隱患的。通?？稍O(shè)置為30000毫秒。
keepAliveTimeout - 長連接最大保持時(shí)間（毫秒）。此處為15秒。
maxKeepAliveRequests - 最大長連接個(gè)數(shù)（1表示禁用，-1表示不限制個(gè)數(shù)，默認(rèn)100個(gè)。一般設(shè)置在100~200之間）
maxHttpHeaderSize - http請求頭信息的最大程度，超過此長度的部分不予處理。一般8K。
URIEncoding - 指定Tomcat容器的URL編碼格式。
acceptCount - 指定當(dāng)所有可以使用的處理請求的線程數(shù)都被使用時(shí)，可以放到處理隊(duì)列中的請求數(shù)，超過這個(gè)數(shù)的請求將不予處理，默認(rèn)為10個(gè)。

disableUploadTimeout - 上傳時(shí)是否使用超時(shí)機(jī)制
enableLookups - 是否反查域名，取值為：true或false。為了提高處理能力，應(yīng)設(shè)置為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 - 最大空閑連接數(shù)，一旦創(chuàng)建的線程超過這個(gè)值，Tomcat就會(huì)關(guān)閉不再需要的socket線程 The default value is 50.
maxThreads - 最多同時(shí)處理的連接數(shù)，Tomcat使用線程來處理接收的每個(gè)請求。這個(gè)值表示Tomcat可創(chuàng)建的最大的線程數(shù)。 minSpareThreads - 最小空閑線程數(shù)，Tomcat初始化時(shí)創(chuàng)建的線程數(shù) .
minProcessors - 最小空閑連接線程數(shù)，用于提高系統(tǒng)處理性能，默認(rèn)值為10。
maxProcessors - 最大連接線程數(shù)，即：并發(fā)處理的最大請求數(shù)，默認(rèn)值為75。

修改啟動(dòng)時(shí)內(nèi)存參數(shù)

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：前后二者區(qū)別，有無set，有無雙引號。

寫Socket做測試

以下是Groovy代碼

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
}