Voyager of Linux

Database, Redis

Python redis 테스트 스크립트.

02/24/2015

랜덤으로 키를 생성해서 값을 넣도록 만든 Python redis 테스트 스크립트.

#!/usr/bin/env python

from multiprocessing import Process
import redis
import random
import string
import time

def id_generator(size=6, chars=string.ascii_uppercase + string.digits):
    return ''.join(random.choice(chars) for x in range(size))

data = id_generator(12, "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz!@#$%^&*()")

def g(idx):
        r_server = redis.Redis('localhost')
        for i in xrange(idx * 1024 * 1024 * 2, (idx+1)*1024*1024 * 2):
                key = 'PR%s'%(id_generator(random.randrange(6,15), "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz!@#$%^&*()"))
                if random.randrange(1,100) > 70:
                        r_server.setex(key, id_generator(random.randrange(128,1024), "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz!@#$%^&*()"),random.randrange(1,350))
                        print "expire key: %s" % key
                else:
                        r_server.set(key, id_generator(random.randrange(128,1024), "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz!@#$%^&*()"))
                        print "permanent key: %s" % key
                time.sleep(0.2)

if __name__ == '__main__':

    pids = []
    for i in xrange(80):
        p = Process(target=g, args=(i,))
        pids.append(p)
        p.start()

    for pid in pids:
        pid.join()

#!/usr/bin/env python

from multiprocessing import Process

import redis

import random

import string

import time

def id_generator(size=6, chars=string.ascii_uppercase + string.digits):

return ''.join(random.choice(chars) for x in range(size))

data = id_generator(12, "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz!@#$%^&*()")

def g(idx):

r_server = redis.Redis('localhost')

for i in xrange(idx * 1024 * 1024 * 2, (idx+1)*1024*1024 * 2):

key = 'PR%s'%(id_generator(random.randrange(6,15), "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz!@#$%^&*()"))

if random.randrange(1,100) > 70:

r_server.setex(key, id_generator(random.randrange(128,1024), "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz!@#$%^&*()"),random.randrange(1,350))

print "expire key: %s" % key

else:

r_server.set(key, id_generator(random.randrange(128,1024), "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz!@#$%^&*()"))

print "permanent key: %s" % key

time.sleep(0.2)

if __name__ == '__main__':

pids = []

for i in xrange(80):

p = Process(target=g, args=(i,))

pids.append(p)

p.start()

for pid in pids:

pid.join()

Java, Programming

tomcat jmx 소스

02/11/2015

JMX 소스

import javax.management.MBeanServerConnection;
import javax.management.ObjectName;
import javax.management.openmbean.CompositeData;
import javax.management.remote.JMXConnector;
import javax.management.remote.JMXConnectorFactory;
import javax.management.remote.JMXServiceURL;

import java.io.Console;

public class check_jmx {

	public static final char ESC = 27;
	
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		try {
			// Create an RMI connector client and
			// connect it to the RMI connector server
			//
			JMXServiceURL url =
				new JMXServiceURL("service:jmx:rmi:///jndi/rmi://127.0.0.1:9999/jmxrmi");
			JMXConnector jmxc = JMXConnectorFactory.connect(url, null);
			MBeanServerConnection mbsc = jmxc.getMBeanServerConnection();
			
			ObjectName tomcatThreadPoolObh = new ObjectName("Catalina:type=Executor,name=tomcatThreadPool");
			Object activeCnt = mbsc.getAttribute(tomcatThreadPoolObh, "activeCount");
			
			ObjectName memoryObh = new ObjectName("java.lang:type=Memory");
			CompositeData memoryRes = (CompositeData) mbsc.getAttribute(memoryObh, "HeapMemoryUsage");
			
			Console c = System.console();
			if (c == null) {
				System.err.println("no console");
				System.exit(1);
			}
			
			// clear screen only the first time
			c.writer().print(ESC + "[2J");
			c.flush();
			Thread.sleep(200);
		
			for (int i = 0; i < 100000; ++i) {
				// reposition the cursor to 1|1
				c.writer().print(ESC + "[1;1H");
				c.flush();
				
				//c.writer().println("hello " + i);
				c.writer().println("activeCount = " + activeCnt);
				c.writer().println("HeapMemoryUsage committed = " + memoryRes.get("committed"));
				c.writer().println("HeapMemoryUsage init = " + memoryRes.get("init"));
				c.writer().println("HeapMemoryUsage max = " + memoryRes.get("max"));
				c.writer().println("HeapMemoryUsage used = " + memoryRes.get("used"));
				c.flush();
			
				Thread.sleep(5000);
			}
			
			/*
			echo("activeCount = " + activeCnt);
			echo("HeapMemoryUsage committed = " + memoryRes.get("committed"));
			echo("HeapMemoryUsage init = " + memoryRes.get("init"));
			echo("HeapMemoryUsage max = " + memoryRes.get("max"));
			echo("HeapMemoryUsage used = " + memoryRes.get("used"));
			*/

			jmxc.close();
			
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	
	private static void echo(String msg) {
		System.out.println(msg);
	}

}

import javax.management.MBeanServerConnection;

import javax.management.ObjectName;

import javax.management.openmbean.CompositeData;

import javax.management.remote.JMXConnector;

import javax.management.remote.JMXConnectorFactory;

import javax.management.remote.JMXServiceURL;

import java.io.Console;

public class check_jmx {

public static final char ESC = 27;

public static void main(String[] args) {

// TODO Auto-generated method stub

try {

// Create an RMI connector client and

// connect it to the RMI connector server

JMXServiceURL url =

new JMXServiceURL("service:jmx:rmi:///jndi/rmi://127.0.0.1:9999/jmxrmi");

JMXConnector jmxc = JMXConnectorFactory.connect(url, null);

MBeanServerConnection mbsc = jmxc.getMBeanServerConnection();

ObjectName tomcatThreadPoolObh = new ObjectName("Catalina:type=Executor,name=tomcatThreadPool");

Object activeCnt = mbsc.getAttribute(tomcatThreadPoolObh, "activeCount");

ObjectName memoryObh = new ObjectName("java.lang:type=Memory");

CompositeData memoryRes = (CompositeData) mbsc.getAttribute(memoryObh, "HeapMemoryUsage");

Console c = System.console();

if (c == null) {

System.err.println("no console");

System.exit(1);

}

// clear screen only the first time

c.writer().print(ESC + "[2J");

c.flush();

Thread.sleep(200);

for (int i = 0; i < 100000; ++i) {

// reposition the cursor to 1|1

c.writer().print(ESC + "[1;1H");

c.flush();

//c.writer().println("hello " + i);

c.writer().println("activeCount = " + activeCnt);

c.writer().println("HeapMemoryUsage committed = " + memoryRes.get("committed"));

c.writer().println("HeapMemoryUsage init = " + memoryRes.get("init"));

c.writer().println("HeapMemoryUsage max = " + memoryRes.get("max"));

c.writer().println("HeapMemoryUsage used = " + memoryRes.get("used"));

c.flush();

Thread.sleep(5000);

}

echo("activeCount = " + activeCnt);

echo("HeapMemoryUsage committed = " + memoryRes.get("committed"));

echo("HeapMemoryUsage init = " + memoryRes.get("init"));

echo("HeapMemoryUsage max = " + memoryRes.get("max"));

echo("HeapMemoryUsage used = " + memoryRes.get("used"));

jmxc.close();

} catch (Exception e) {

e.printStackTrace();

}

private static void echo(String msg) {

System.out.println(msg);

}

Database, Redis

Redis 설치하기

02/07/2015

Redis 는 Key-Value 로 데이터를 저장하는 NoSQL 서버 입니다. In Memory 기반으로 동작하기 때문에 빠른 응답속도를 보입니다. 이 문서는 Redis 설치에 관한 문서 입니다. 다운로드

wget http://download.redis.io/releases/redis-2.8.19.tar.gz

1	wget http://download.redis.io/releases/redis-2.8.19.tar.gz

의존성 패키지 설치 CentOS 의 경우에는 다음과 같이 설치를 해줍니다.

yum install gcc.x86_64 gcc-c++.x86_64 wget.x86_64 bzip2-devel.x86_64 pkgconfig.x86_64 openssl-devel.x86_64 make.x86_64 man.x86_64 nasm.x86_64 gmp.x86_64 gdbm-devel.x86_64 readline-devel.x86_64 compat-readline43.x86_64 ncurses-devel.x86_64 db4-devel.x86_64 automake* autoconf* pcre-devel.x86_64 -y

yum install tcl-devel.x86_64 tcl.x86_64

yum install gcc.x86_64 gcc-c++.x86_64 wget.x86_64 bzip2-devel.x86_64 pkgconfig.x86_64 openssl-devel.x86_64 make.x86_64 man.x86_64 nasm.x86_64 gmp.x86_64 gdbm-devel.x86_64 readline-devel.x86_64 compat-readline43.x86_64 ncurses-devel.x86_64 db4-devel.x86_64 automake* autoconf* pcre-devel.x86_64 -y

yum install tcl-devel.x86_64 tcl.x86_64

Ubuntu 의 경우에는 다음과 같이 설치를 해줍니다.

sudo apt-get install build-essential

sudo apt-get install tcl8.5

sudo apt-get install build-essential

sudo apt-get install tcl8.5

컴파일

make

make

설치 설치는 PREFIX 를 인자로 줘서 설치 디렉토리 위치를 지정해줄 수 있습니다.

make install PREFIX=/usr/local/redis

1	make install PREFIX=/usr/local/redis

Redis 의 설치는 오로지 실행파일들만 복사해 줍니다. 설정 Redis 는 설치 후에 각종 설정을 할 수 있도록 스크립트를 지원 […]

HowTo, Linux

Cassandra 데이터 모델.

02/03/2015

Java, Programming

JMX 로 Tomcat 모니터링 하기.

01/29/2015

톰캣(Tomcat)은 JEE의 Web Container 의 구현에 입니다. 흔히 WAS 서버라고 하죠. 많은 기능이 있지만 이번에는 JMX를 설정하고 이를 이용해서 Tomcat 을 모니터링 해보겠습니다. JMX는 Java Management eXtension 으로 자바 서비스들을 관리하고 모니터링하기위한 API를 제공하는 기능을 포함하는 기술입니다. Tomcat 오 자바 서비스의 일종임으로 JMX를 이용할 수 있습니다. 톰캣(Tomcat)의 경우에 아쉽게도 기본 배포본에 이를 위한 라이브러리가 포함되어 있지않아 이 기능을 이용하기 위해서는 톰캣용 JMX 라이브러리를 다운받고 톰캣을 재시작 해줘야 합니다.

# 톰캣버전에 맞는 JMX 를 다운받으시길 바랍니다.
http://apache.mirror.cdnetworks.com/tomcat/tomcat-7/v7.0.57/bin/extras/catalina-jmx-remote.jar

1 2	# 톰캣버전에 맞는 JMX 를 다운받으시길 바랍니다. http://apache.mirror.cdnetworks.com/tomcat/tomcat-7/v7.0.57/bin/extras/catalina-jmx-remote.jar

이 파일을 톰캣(Tomcat) 라이브러리 디렉토리인 lib 에 넣어줍니다. 그리고 톰캣(Tomcat)시작 스크립트에 […]

Installation, Linux

Cassandra 2.1.2 설치하기.

01/28/2015

카산드라(Cassandra)는 분산 데이터 스토리지 시스템 입니다. 아파치 재단에서 오픈소스로 만들어 배포하고 있고, 자바기반으로 제작되었습니다. peer to peer 프로토콜을 이용한 고가용성이 구현되어 있습니다. 이 문서는 카산드라(Cassandra) 2.1.2 에 싱글(Single) 노드를 위한 설치에 대한 것입니다. 설치환경은 CentOS 입니다. jdk 7 update 75 카산드라(Cassandra) 2.1.2 는 jdk 7 update 75 버전 이상을 필요로 합니다. 만일 idk 버전 이하를 사용한다면 시작스크립트에서 오류를 내며 작동하지 않습니다. Oracle 홈페이지에서 jdk 7 update 75 를 다운받아 다음과 같이 압축을 해제합니다.

tar xvzf jdk-7u75-linux-x64.tar.gz -C /opt
cd /opt
ln -s jdk1.7.0_75 jdk

tar xvzf jdk-7u75-linux-x64.tar.gz -C /opt

cd /opt

ln -s jdk1.7.0_75 jdk

카산드라(Cassandra) 2.1.2 설치 카산드라(Cassandra) 는 […]

Power User

Windows 10 테크니컬 프리뷰

01/25/2015

Windows 10 Techincal Preview 가 1월 21일 나왔습니다. 이번 프리뷰는 컨슈머를 위한 것으로 지난해 10월에 발표한 프리뷰에 이은 두번째 공개입니다. Windows10 은 Windows 8.1 에 뒤를 이어 출시되는 MS 사의 운영체제로 관심을 모으고 있습니다. Windows 8.1 이 모바일 디바이스와 데스크탑을 통합하려고 했던 것이였는데 결과적으로 실패였다는 평가가 많았습니다. 데스크탑시장에서는 Windows 7 이 여전히 안정적이게 동작하고 많은 사용자를 확보해놓은 상태였고 Windows 8.1 을 탑재한 모바일 디바이스의 판매도 부진했습니다. 그래서 그런지 몰라도 이번에 Windows 10 에서는 기존 데스크탑으로 우선 포커스를 맞춘 느낌입니다. 기존의 […]

HowTo, Linux

top 사용시 command 매칭된것만 보기.

01/21/2015

top 은 리눅스에서 아주 유용한 시스템 모니터링 툴 입니다. 매우 많은 옵션도 제공하는데, 그중에서 프로세스의 명령어와 매칭되는 것만 보여주기도 한다. -c 옵션이 그것인데, 다음과 같이 pgrep 과 조합해서 사용할 수 있다.

top -c -p $(pgrep -d',' -f 매칭할스트링) -H

1	top -c -p $(pgrep -d',' -f 매칭할스트링) -H

Java, Programming

jstack 과 thread Id, CPU, Mem 사용량 체크.

01/21/2015

jstack 은 자바 애플리케이션의 쓰레드(Thread) 덤프를 뜰 수 있도록 도와주는 도구 입니다. 자바 애플리케이션의 쓰레드의 상태를 상세히 알 수 있어서 자바 애플리케이션의 프로파일링을 할 수 있고 이를 통해서 성능을 개선할 수 있습니다. 예를들면 다음과 같습니다.

2015-01-21 21:11:12
Full thread dump OpenJDK 64-Bit Server VM (23.25-b01 mixed mode):

"Attach Listener" daemon prio=10 tid=0x00007fa830001000 nid=0x3c5a waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

   Locked ownable synchronizers:
	- None

"ajp-bio-8309-AsyncTimeout" daemon prio=10 tid=0x00007fa85ca18000 nid=0x2e47 waiting on condition [0x00007fa8508f4000]
   java.lang.Thread.State: TIMED_WAITING (sleeping)
	at java.lang.Thread.sleep(Native Method)
	at org.apache.tomcat.util.net.JIoEndpoint$AsyncTimeout.run(JIoEndpoint.java:152)
	at java.lang.Thread.run(Thread.java:701)

   Locked ownable synchronizers:
	- None

"ajp-bio-8309-Acceptor-0" daemon prio=10 tid=0x00007fa85ca16000 nid=0x2e46 runnable [0x00007fa8509f5000]
   java.lang.Thread.State: RUNNABLE
	at java.net.PlainSocketImpl.socketAccept(Native Method)
	at java.net.AbstractPlainSocketImpl.accept(AbstractPlainSocketImpl.java:375)
	at java.net.ServerSocket.implAccept(ServerSocket.java:478)
	at java.net.ServerSocket.accept(ServerSocket.java:446)
	at org.apache.tomcat.util.net.DefaultServerSocketFactory.acceptSocket(DefaultServerSocketFactory.java:60)
	at org.apache.tomcat.util.net.JIoEndpoint$Acceptor.run(JIoEndpoint.java:220)
	at java.lang.Thread.run(Thread.java:701)

   Locked ownable synchronizers:
	- None

"http-bio-8380-AsyncTimeout" daemon prio=10 tid=0x00007fa85ca13800 nid=0x2e45 waiting on condition [0x00007fa850af6000]
   java.lang.Thread.State: TIMED_WAITING (sleeping)
	at java.lang.Thread.sleep(Native Method)
	at org.apache.tomcat.util.net.JIoEndpoint$AsyncTimeout.run(JIoEndpoint.java:152)
	at java.lang.Thread.run(Thread.java:701)

   Locked ownable synchronizers:
	- None

"http-bio-8380-Acceptor-0" daemon prio=10 tid=0x00007fa85ca12000 nid=0x2e44 runnable [0x00007fa850bf7000]
   java.lang.Thread.State: RUNNABLE
	at java.net.PlainSocketImpl.socketAccept(Native Method)
	at java.net.AbstractPlainSocketImpl.accept(AbstractPlainSocketImpl.java:375)
	at java.net.ServerSocket.implAccept(ServerSocket.java:478)
	at java.net.ServerSocket.accept(ServerSocket.java:446)
	at org.apache.tomcat.util.net.DefaultServerSocketFactory.acceptSocket(DefaultServerSocketFactory.java:60)
	at org.apache.tomcat.util.net.JIoEndpoint$Acceptor.run(JIoEndpoint.java:220)
	at java.lang.Thread.run(Thread.java:701)

   Locked ownable synchronizers:
	- None

"ContainerBackgroundProcessor[StandardEngine[Catalina]]" daemon prio=10 tid=0x00007fa85ca0f800 nid=0x2e43 waiting on condition [0x00007fa850cf8000]
   java.lang.Thread.State: TIMED_WAITING (sleeping)
	at java.lang.Thread.sleep(Native Method)
	at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1513)
	at java.lang.Thread.run(Thread.java:701)

   Locked ownable synchronizers:
	- None

"GroupChannel-Heartbeat-1" daemon prio=10 tid=0x00007fa85ca0b800 nid=0x2e40 waiting on condition [0x00007fa85100d000]
   java.lang.Thread.State: TIMED_WAITING (sleeping)
	at java.lang.Thread.sleep(Native Method)
	at org.apache.catalina.tribes.group.GroupChannel$HeartbeatThread.run(GroupChannel.java:689)

   Locked ownable synchronizers:
	- None

"Tribes-MembershipSender" daemon prio=10 tid=0x00007fa85ca0a000 nid=0x2e3e waiting on condition [0x00007fa85110e000]
   java.lang.Thread.State: TIMED_WAITING (sleeping)
	at java.lang.Thread.sleep(Native Method)
	at org.apache.catalina.tribes.membership.McastServiceImpl$SenderThread.run(McastServiceImpl.java:580)

   Locked ownable synchronizers:
	- None

"Tribes-MembershipReceiver" daemon prio=10 tid=0x00007fa85ca08800 nid=0x2e3d runnable [0x00007fa85120f000]
   java.lang.Thread.State: RUNNABLE
	at java.net.PlainDatagramSocketImpl.receive0(Native Method)
	- locked <0x00000000a5730da0> (a java.net.PlainDatagramSocketImpl)
	at java.net.AbstractPlainDatagramSocketImpl.receive(AbstractPlainDatagramSocketImpl.java:136)
	- locked <0x00000000a5730da0> (a java.net.PlainDatagramSocketImpl)
	at java.net.DatagramSocket.receive(DatagramSocket.java:759)
	- locked <0x00000000a5803e80> (a java.net.DatagramPacket)
	- locked <0x00000000a5803e48> (a java.net.MulticastSocket)
	at org.apache.catalina.tribes.membership.McastServiceImpl.receive(McastServiceImpl.java:339)
	at org.apache.catalina.tribes.membership.McastServiceImpl$ReceiverThread.run(McastServiceImpl.java:533)

   Locked ownable synchronizers:
	- None

"NioReceiver" daemon prio=10 tid=0x00007fa85c9da800 nid=0x2e3c runnable [0x00007fa851310000]
   java.lang.Thread.State: RUNNABLE
	at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
	at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:228)
	at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:83)
	at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:87)
	- locked <0x00000000a57ca768> (a sun.nio.ch.Util$1)
	- locked <0x00000000a57ca758> (a java.util.Collections$UnmodifiableSet)
	- locked <0x00000000a57ca710> (a sun.nio.ch.EPollSelectorImpl)
	at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:98)
	at org.apache.catalina.tribes.transport.nio.NioReceiver.listen(NioReceiver.java:283)
	at org.apache.catalina.tribes.transport.nio.NioReceiver.run(NioReceiver.java:433)
	at java.lang.Thread.run(Thread.java:701)

   Locked ownable synchronizers:
	- None

"GC Daemon" daemon prio=10 tid=0x00007fa85c934000 nid=0x2e38 in Object.wait() [0x00007fa85183a000]
   java.lang.Thread.State: TIMED_WAITING (on object monitor)
	at java.lang.Object.wait(Native Method)
	- waiting on <0x00000000a55cc360> (a sun.misc.GC$LatencyLock)
	at sun.misc.GC$Daemon.run(GC.java:117)
	- locked <0x00000000a55cc360> (a sun.misc.GC$LatencyLock)

   Locked ownable synchronizers:
	- None

"Low Memory Detector" daemon prio=10 tid=0x00007fa85c0fa000 nid=0x2e36 runnable [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

   Locked ownable synchronizers:
	- None

"C2 CompilerThread1" daemon prio=10 tid=0x00007fa85c0f8000 nid=0x2e35 waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

   Locked ownable synchronizers:
	- None

"C2 CompilerThread0" daemon prio=10 tid=0x00007fa85c0f5000 nid=0x2e34 waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

   Locked ownable synchronizers:
	- None

"Signal Dispatcher" daemon prio=10 tid=0x00007fa85c0f2800 nid=0x2e33 runnable [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

   Locked ownable synchronizers:
	- None

"Finalizer" daemon prio=10 tid=0x00007fa85c0a4000 nid=0x2e32 in Object.wait() [0x00007fa85254c000]
   java.lang.Thread.State: WAITING (on object monitor)
	at java.lang.Object.wait(Native Method)
	- waiting on <0x00000000a57188a8> (a java.lang.ref.ReferenceQueue$Lock)
	at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:133)
	- locked <0x00000000a57188a8> (a java.lang.ref.ReferenceQueue$Lock)
	at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:149)
	at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:189)

   Locked ownable synchronizers:
	- None

"Reference Handler" daemon prio=10 tid=0x00007fa85c0a2000 nid=0x2e31 in Object.wait() [0x00007fa85264d000]
   java.lang.Thread.State: WAITING (on object monitor)
	at java.lang.Object.wait(Native Method)
	- waiting on <0x00000000a57ff5a0> (a java.lang.ref.Reference$Lock)
	at java.lang.Object.wait(Object.java:502)
	at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:133)
	- locked <0x00000000a57ff5a0> (a java.lang.ref.Reference$Lock)

   Locked ownable synchronizers:
	- None

"main" prio=10 tid=0x00007fa85c009000 nid=0x2e2b runnable [0x00007fa86611b000]
   java.lang.Thread.State: RUNNABLE
	at java.net.PlainSocketImpl.socketAccept(Native Method)
	at java.net.AbstractPlainSocketImpl.accept(AbstractPlainSocketImpl.java:375)
	at java.net.ServerSocket.implAccept(ServerSocket.java:478)
	at java.net.ServerSocket.accept(ServerSocket.java:446)
	at org.apache.catalina.core.StandardServer.await(StandardServer.java:453)
	at org.apache.catalina.startup.Catalina.await(Catalina.java:777)
	at org.apache.catalina.startup.Catalina.start(Catalina.java:723)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:622)
	at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:321)
	at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:455)

   Locked ownable synchronizers:
	- None

"VM Thread" prio=10 tid=0x00007fa85c093000 nid=0x2e30 runnable 

"GC task thread#0 (ParallelGC)" prio=10 tid=0x00007fa85c016800 nid=0x2e2c runnable 

"GC task thread#1 (ParallelGC)" prio=10 tid=0x00007fa85c018800 nid=0x2e2d runnable 

"GC task thread#2 (ParallelGC)" prio=10 tid=0x00007fa85c01a000 nid=0x2e2e runnable 

"GC task thread#3 (ParallelGC)" prio=10 tid=0x00007fa85c01c000 nid=0x2e2f runnable 

"VM Periodic Task Thread" prio=10 tid=0x00007fa85c105000 nid=0x2e37 waiting on condition 

JNI global references: 127

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105

106

107

108

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113

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117

118

119

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126

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2015-01-21 21:11:12

Full thread dump OpenJDK 64-Bit Server VM (23.25-b01 mixed mode):

"Attach Listener" daemon prio=10 tid=0x00007fa830001000 nid=0x3c5a waiting on condition [0x0000000000000000]

java.lang.Thread.State: RUNNABLE

Locked ownable synchronizers:

- None

"ajp-bio-8309-AsyncTimeout" daemon prio=10 tid=0x00007fa85ca18000 nid=0x2e47 waiting on condition [0x00007fa8508f4000]

java.lang.Thread.State: TIMED_WAITING (sleeping)

at java.lang.Thread.sleep(Native Method)

at org.apache.tomcat.util.net.JIoEndpoint$AsyncTimeout.run(JIoEndpoint.java:152)

at java.lang.Thread.run(Thread.java:701)

Locked ownable synchronizers:

- None

"ajp-bio-8309-Acceptor-0" daemon prio=10 tid=0x00007fa85ca16000 nid=0x2e46 runnable [0x00007fa8509f5000]

java.lang.Thread.State: RUNNABLE

at java.net.PlainSocketImpl.socketAccept(Native Method)

at java.net.AbstractPlainSocketImpl.accept(AbstractPlainSocketImpl.java:375)

at java.net.ServerSocket.implAccept(ServerSocket.java:478)

at java.net.ServerSocket.accept(ServerSocket.java:446)

at org.apache.tomcat.util.net.DefaultServerSocketFactory.acceptSocket(DefaultServerSocketFactory.java:60)

at org.apache.tomcat.util.net.JIoEndpoint$Acceptor.run(JIoEndpoint.java:220)

at java.lang.Thread.run(Thread.java:701)

Locked ownable synchronizers:

- None

"http-bio-8380-AsyncTimeout" daemon prio=10 tid=0x00007fa85ca13800 nid=0x2e45 waiting on condition [0x00007fa850af6000]

java.lang.Thread.State: TIMED_WAITING (sleeping)

at java.lang.Thread.sleep(Native Method)

at org.apache.tomcat.util.net.JIoEndpoint$AsyncTimeout.run(JIoEndpoint.java:152)

at java.lang.Thread.run(Thread.java:701)

Locked ownable synchronizers:

- None

"http-bio-8380-Acceptor-0" daemon prio=10 tid=0x00007fa85ca12000 nid=0x2e44 runnable [0x00007fa850bf7000]

java.lang.Thread.State: RUNNABLE

at java.net.PlainSocketImpl.socketAccept(Native Method)

at java.net.AbstractPlainSocketImpl.accept(AbstractPlainSocketImpl.java:375)

at java.net.ServerSocket.implAccept(ServerSocket.java:478)

at java.net.ServerSocket.accept(ServerSocket.java:446)

at org.apache.tomcat.util.net.DefaultServerSocketFactory.acceptSocket(DefaultServerSocketFactory.java:60)

at org.apache.tomcat.util.net.JIoEndpoint$Acceptor.run(JIoEndpoint.java:220)

at java.lang.Thread.run(Thread.java:701)

Locked ownable synchronizers:

- None

"ContainerBackgroundProcessor[StandardEngine[Catalina]]" daemon prio=10 tid=0x00007fa85ca0f800 nid=0x2e43 waiting on condition [0x00007fa850cf8000]

java.lang.Thread.State: TIMED_WAITING (sleeping)

at java.lang.Thread.sleep(Native Method)

at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1513)

at java.lang.Thread.run(Thread.java:701)

Locked ownable synchronizers:

- None

"GroupChannel-Heartbeat-1" daemon prio=10 tid=0x00007fa85ca0b800 nid=0x2e40 waiting on condition [0x00007fa85100d000]

java.lang.Thread.State: TIMED_WAITING (sleeping)

at java.lang.Thread.sleep(Native Method)

at org.apache.catalina.tribes.group.GroupChannel$HeartbeatThread.run(GroupChannel.java:689)

Locked ownable synchronizers:

- None

"Tribes-MembershipSender" daemon prio=10 tid=0x00007fa85ca0a000 nid=0x2e3e waiting on condition [0x00007fa85110e000]

java.lang.Thread.State: TIMED_WAITING (sleeping)

at java.lang.Thread.sleep(Native Method)

at org.apache.catalina.tribes.membership.McastServiceImpl$SenderThread.run(McastServiceImpl.java:580)

Locked ownable synchronizers:

- None

"Tribes-MembershipReceiver" daemon prio=10 tid=0x00007fa85ca08800 nid=0x2e3d runnable [0x00007fa85120f000]

java.lang.Thread.State: RUNNABLE

at java.net.PlainDatagramSocketImpl.receive0(Native Method)

- locked <0x00000000a5730da0> (a java.net.PlainDatagramSocketImpl)

at java.net.AbstractPlainDatagramSocketImpl.receive(AbstractPlainDatagramSocketImpl.java:136)

- locked <0x00000000a5730da0> (a java.net.PlainDatagramSocketImpl)

at java.net.DatagramSocket.receive(DatagramSocket.java:759)

- locked <0x00000000a5803e80> (a java.net.DatagramPacket)

- locked <0x00000000a5803e48> (a java.net.MulticastSocket)

at org.apache.catalina.tribes.membership.McastServiceImpl.receive(McastServiceImpl.java:339)

at org.apache.catalina.tribes.membership.McastServiceImpl$ReceiverThread.run(McastServiceImpl.java:533)

Locked ownable synchronizers:

- None

"NioReceiver" daemon prio=10 tid=0x00007fa85c9da800 nid=0x2e3c runnable [0x00007fa851310000]

java.lang.Thread.State: RUNNABLE

at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)

at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:228)

at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:83)

at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:87)

- locked <0x00000000a57ca768> (a sun.nio.ch.Util$1)

- locked <0x00000000a57ca758> (a java.util.Collections$UnmodifiableSet)

- locked <0x00000000a57ca710> (a sun.nio.ch.EPollSelectorImpl)

at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:98)

at org.apache.catalina.tribes.transport.nio.NioReceiver.listen(NioReceiver.java:283)

at org.apache.catalina.tribes.transport.nio.NioReceiver.run(NioReceiver.java:433)

at java.lang.Thread.run(Thread.java:701)

Locked ownable synchronizers:

- None

"GC Daemon" daemon prio=10 tid=0x00007fa85c934000 nid=0x2e38 in Object.wait() [0x00007fa85183a000]

java.lang.Thread.State: TIMED_WAITING (on object monitor)

at java.lang.Object.wait(Native Method)

- waiting on <0x00000000a55cc360> (a sun.misc.GC$LatencyLock)

at sun.misc.GC$Daemon.run(GC.java:117)

- locked <0x00000000a55cc360> (a sun.misc.GC$LatencyLock)

Locked ownable synchronizers:

- None

"Low Memory Detector" daemon prio=10 tid=0x00007fa85c0fa000 nid=0x2e36 runnable [0x0000000000000000]

java.lang.Thread.State: RUNNABLE

Locked ownable synchronizers:

- None

"C2 CompilerThread1" daemon prio=10 tid=0x00007fa85c0f8000 nid=0x2e35 waiting on condition [0x0000000000000000]

java.lang.Thread.State: RUNNABLE

Locked ownable synchronizers:

- None

"C2 CompilerThread0" daemon prio=10 tid=0x00007fa85c0f5000 nid=0x2e34 waiting on condition [0x0000000000000000]

java.lang.Thread.State: RUNNABLE

Locked ownable synchronizers:

- None

"Signal Dispatcher" daemon prio=10 tid=0x00007fa85c0f2800 nid=0x2e33 runnable [0x0000000000000000]

java.lang.Thread.State: RUNNABLE

Locked ownable synchronizers:

- None

"Finalizer" daemon prio=10 tid=0x00007fa85c0a4000 nid=0x2e32 in Object.wait() [0x00007fa85254c000]

java.lang.Thread.State: WAITING (on object monitor)

at java.lang.Object.wait(Native Method)

- waiting on <0x00000000a57188a8> (a java.lang.ref.ReferenceQueue$Lock)

at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:133)

- locked <0x00000000a57188a8> (a java.lang.ref.ReferenceQueue$Lock)

at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:149)

at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:189)

Locked ownable synchronizers:

- None

"Reference Handler" daemon prio=10 tid=0x00007fa85c0a2000 nid=0x2e31 in Object.wait() [0x00007fa85264d000]

java.lang.Thread.State: WAITING (on object monitor)

at java.lang.Object.wait(Native Method)

- waiting on <0x00000000a57ff5a0> (a java.lang.ref.Reference$Lock)

at java.lang.Object.wait(Object.java:502)

at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:133)

- locked <0x00000000a57ff5a0> (a java.lang.ref.Reference$Lock)

Locked ownable synchronizers:

- None

"main" prio=10 tid=0x00007fa85c009000 nid=0x2e2b runnable [0x00007fa86611b000]

java.lang.Thread.State: RUNNABLE

at java.net.PlainSocketImpl.socketAccept(Native Method)

at java.net.AbstractPlainSocketImpl.accept(AbstractPlainSocketImpl.java:375)

at java.net.ServerSocket.implAccept(ServerSocket.java:478)

at java.net.ServerSocket.accept(ServerSocket.java:446)

at org.apache.catalina.core.StandardServer.await(StandardServer.java:453)

at org.apache.catalina.startup.Catalina.await(Catalina.java:777)

at org.apache.catalina.startup.Catalina.start(Catalina.java:723)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:622)

at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:321)

at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:455)

Locked ownable synchronizers:

- None

"VM Thread" prio=10 tid=0x00007fa85c093000 nid=0x2e30 runnable

"GC task thread#0 (ParallelGC)" prio=10 tid=0x00007fa85c016800 nid=0x2e2c runnable

"GC task thread#1 (ParallelGC)" prio=10 tid=0x00007fa85c018800 nid=0x2e2d runnable

"GC task thread#2 (ParallelGC)" prio=10 tid=0x00007fa85c01a000 nid=0x2e2e runnable

"GC task thread#3 (ParallelGC)" prio=10 tid=0x00007fa85c01c000 nid=0x2e2f runnable

"VM Periodic Task Thread" prio=10 tid=0x00007fa85c105000 nid=0x2e37 waiting on condition

JNI global references: 127

문제는 이렇게 jstack 의 결과을 보면 당시 쓰레드에 OS 의 자원사용량을 알 방법이 없습니다. OS의 자원이라고 하면 CPU, MEM 등과 같은 것입니다. jstack 의 결과에는 tid 라고 해서 Thread ID 가 헥사(16 진수)로 표시됩니다. 이는 OS상에서 자바 애플리케이션의 쓰레드의 PID 를 가리킵니다. 그래서 jstack […]

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Tomcat Multi Instance 설정하기

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Tomcat 7 서버는 Multi Instance 라는 기능을 가지고 있습니다. 하나의 엔진에 다수의 Instance 를 구동하게하는 것을 말합니다. Tomcat 7 용어 정리 Tomcat Multi Instance 설정하기 전에 용어를 설명하겠습니다. Tomcat 은 엔진과 인스턴스(Intance) 로 나뉩니다. 이는 디렉토리별로 구분이 가능한데, 엔진부분과 인스턴스 부분의 디렉토리는 다음과 같습니다. Tomcat Engine 부분: bin, lib Tomcat Instance 부분: conf, logs, temp, work, webapps 사실 Tomcat 을 다운받아 압축을 해제하면 엔진부분과 인스턴스부분이 함께 들어 있기 때문에 별 구별이 안되는 측면이 있지만 엄밀히 따지면 위와같이 구분을 할 수 […]