Java内存过高问题排查

1、使用命令：top 查看当前进程的状态

Java内存过高问题排查

2、从上图可以看到PID：916的java进程占用内存较大。定位线程问题（通过命令查看PID 为25894 进程的线程情况）,命令：# ps p 916 -L -o pcpu,pmem,pid,tid,time,tname,cmd

Java内存过高问题排查

由此可以看到这PID：916的进程产生了很多线程。接下来就可以通过jstack查看内存使用的堆栈。

3、查看内存使用的堆栈：在这里我们挑选了TID=934的线程进行分析，首先需要将934这个id转换为16进制。需输入如下命令，

printf "%x\n" 9731

4、将PID为916的堆栈信息打印到jstack.log中，命令：jstack -l 916 > jstack.log

5、

查看堆栈信息文件，命令：vim jstack.log

在进行搜索TID为2603的相关信息。如图：

Java内存过高问题排查

6、分析

可以看到这个线程状态为：RUNNABLE。是正在运行状态的

另外其它的大部分线程状态为：WAITING。通过查看文件分析看到大量 Java Thread State。

说明它在等待另一个条件的发生，来把自己唤醒，或者干脆它是调用了 sleep(N)。

此时线程状态大致为以下几种：

java.lang.Thread.State: WAITING (parking)：一直等那个条件发生；

java.lang.Thread.State: TIMED_WAITING (parking或sleeping)：定时的，那个条件不到来，也将定时唤醒自己。

7.代码优化：将文件发送给开发。优化下线程

B:可能是其他原因导致的问题：

1、使用ps命令:ps -ef | grep java | grep -v grep

查看当前java进程列表

root       834     1  0 May13 ?        00:30:09 /usr/lib/jvm/java/bin/java -Djava.util.logging.config.file=/data/apache-tomcat-9.0.13/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djdk.tls.ephemeralDHKeySize=2048 -Djava.protocol.handler.pkgs=org.apache.catalina.webresources -Dorg.apache.catalina.security.SecurityListener.UMASK=0027 -Dignore.endorsed.dirs= -classpath /data/apache-tomcat-9.0.13/bin/bootstrap.jar:/data/apache-tomcat-9.0.13/bin/tomcat-juli.jar -Dcatalina.base=/data/apache-tomcat-9.0.13 -Dcatalina.home=/data/apache-tomcat-9.0.13 -Djava.io.tmpdir=/data/apache-tomcat-9.0.13/temp org.apache.catalina.startup.Bootstrap start
root      1294     1  3 May13 ?        14:41:25 /usr/lib/jvm/java/bin/java -Djava.util.logging.config.file=/data/apache-tomcat-9.0.13/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djdk.tls.ephemeralDHKeySize=2048 -Djava.protocol.handler.pkgs=org.apache.catalina.webresources -Dorg.apache.catalina.security.SecurityListener.UMASK=0027 -Dignore.endorsed.dirs= -classpath /data/apache-tomcat-9.0.13/bin/bootstrap.jar:/data/apache-tomcat-9.0.13/bin/tomcat-juli.jar -Dcatalina.base=/data/apache-tomcat-9.0.13 -Dcatalina.home=/data/apache-tomcat-9.0.13 -Djava.io.tmpdir=/data/apache-tomcat-9.0.13/temp org.apache.catalina.startup.Bootstrap start
root      2085     1  0 Mar05 ?        01:57:08 /usr/lib/jvm/java/bin/java -Djava.util.logging.config.file=/data/apache-tomcat-9.0.13/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djdk.tls.ephemeralDHKeySize=2048 -Djava.protocol.handler.pkgs=org.apache.catalina.webresources -Dorg.apache.catalina.security.SecurityListener.UMASK=0027 -Dignore.endorsed.dirs= -classpath /data/apache-tomcat-9.0.13/bin/bootstrap.jar:/data/apache-tomcat-9.0.13/bin/tomcat-juli.jar -Dcatalina.base=/data/apache-tomcat-9.0.13 -Dcatalina.home=/data/apache-tomcat-9.0.13 -Djava.io.tmpdir=/data/apache-tomcat-9.0.13/temp org.apache.catalina.startup.Bootstrap start
root     12808     1  0 Mar08 ?        01:16:03 /usr/lib/jvm/java/bin/java -Djava.util.logging.config.file=/data/apache-tomcat-9.0.13/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djdk.tls.ephemeralDHKeySize=2048 -Djava.protocol.handler.pkgs=org.apache.catalina.webresources -Dorg.apache.catalina.security.SecurityListener.UMASK=0027 -Dignore.endorsed.dirs= -classpath /data/apache-tomcat-9.0.13/bin/bootstrap.jar:/data/apache-tomcat-9.0.13/bin/tomcat-juli.jar -Dcatalina.base=/data/apache-tomcat-9.0.13 -Dcatalina.home=/data/apache-tomcat-9.0.13 -Djava.io.tmpdir=/data/apache-tomcat-9.0.13/temp org.apache.catalina.startup.Bootstrap start
root     19392     1  0 May09 ?        00:36:19 /usr/lib/jvm/java/bin/java -Djava.util.logging.config.file=/data/apache-tomcat-9.0.13/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djdk.tls.ephemeralDHKeySize=2048 -Djava.protocol.handler.pkgs=org.apache.catalina.webresources -Dorg.apache.catalina.security.SecurityListener.UMASK=0027 -Dignore.endorsed.dirs= -classpath /data/apache-tomcat-9.0.13/bin/bootstrap.jar:/data/apache-tomcat-9.0.13/bin/tomcat-juli.jar -Dcatalina.base=/data/apache-tomcat-9.0.13 -Dcatalina.home=/data/apache-tomcat-9.0.13 -Djava.io.tmpdir=/data/apache-tomcat-9.0.13/temp org.apache.catalina.startup.Bootstrap start
root     19838     1  1 May09 ?        05:32:17 /usr/lib/jvm/java/bin/java -Djava.util.logging.config.file=/data/apache-tomcat-9.0.13/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djdk.tls.ephemeralDHKeySize=2048 -Djava.protocol.handler.pkgs=org.apache.catalina.webresources -Dorg.apache.catalina.security.SecurityListener.UMASK=0027 -Dignore.endorsed.dirs= -classpath /data/apache-tomcat-9.0.13/bin/bootstrap.jar:/data/apache-tomcat-9.0.13/bin/tomcat-juli.jar -Dcatalina.base=/data/apache-tomcat-9.0.13 -Dcatalina.home=/data/apache-tomcat-9.0.13 -Djava.io.tmpdir=/data/apache-tomcat-9.0.13/temp org.apache.catalina.startup.Bootstrap start
root     21543     1  0 May27 ?        00:22:03 /usr/lib/jvm/java/bin/java -Djava.util.logging.config.file=/data/apache-tomcat-9.0.13/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djdk.tls.ephemeralDHKeySize=2048 -Djava.protocol.handler.pkgs=org.apache.catalina.webresources -Dorg.apache.catalina.security.SecurityListener.UMASK=0027 -Dignore.endorsed.dirs= -classpath /data/apache-tomcat-9.0.13/bin/bootstrap.jar:/data/apache-tomcat-9.0.13/bin/tomcat-juli.jar -Dcatalina.base=/data/apache-tomcat-9.0.13 -Dcatalina.home=/data/apache-tomcat-9.0.13 -Djava.io.tmpdir=/data/apache-tomcat-9.0.13/temp org.apache.catalina.startup.Bootstrap start
root     22750     1  5 May27 ?        02:28:41 /usr/lib/jvm/java/bin/java -Djava.util.logging.config.file=/data/apache-tomcat-9.0.13/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djdk.tls.ephemeralDHKeySize=2048 -Djava.protocol.handler.pkgs=org.apache.catalina.webresources -Dorg.apache.catalina.security.SecurityListener.UMASK=0027 -Dignore.endorsed.dirs= -classpath /data/apache-tomcat-9.0.13/bin/bootstrap.jar:/data/apache-tomcat-9.0.13/bin/tomcat-juli.jar -Dcatalina.base=/data/apache-tomcat-9.0.13 -Dcatalina.home=/data/apache-tomcat-9.0.13 -Djava.io.tmpdir=/data/apache-tomcat-9.0.13/temp org.apache.catalina.startup.Bootstrap start

由上图所示，可以看到java进程是Tomcat的启动进程，开启多个Tomcat启动进程，并且是同一个端口。由此，可以判断，是因为关闭Tomcat服务时，java进程没有自动关闭，导致内存没有释放。

2、使用lsof命令:lsof | grep java |grep -v grep

查看当前进程的运行状态

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java 834 root cwd DIR 252,1 4096 393217 /root

java 834 root rtd DIR 252,1 4096 2 /

java 834 root txt REG 252,1 5128 917742 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/bin/java

java 834 root mem REG 252,1 262896 269147 /usr/lib64/libjpeg.so.62.0.0

java 834 root mem REG 252,1 41400 792676 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libjavajpeg.so

java 834 root mem REG 252,1 644072 266782 /usr/lib64/libfreetype.so.6.3.22

java 834 root mem REG 252,1 349032 792667 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libfontmanager.so

java 834 root mem REG 252,1 29072 792665 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libawt_headless.so

java 834 root mem REG 252,1 715224 792664 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libawt.so

java 834 root mem REG 252,1 99174448 269459 /usr/lib/locale/locale-archive

java 834 root mem REG 252,1 111440 656920 /lib64/libresolv-2.12.so

java 834 root mem REG 252,1 27896 655389 /lib64/libnss_dns-2.12.so

....................

java 1294 root cwd DIR 252,1 4096 393217 /root

java 1294 root rtd DIR 252,1 4096 2 /

java 1294 root txt REG 252,1 5128 917742 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/bin/java

java 1294 root mem REG 252,1 99174448 269459 /usr/lib/locale/locale-archive

java 1294 root mem REG 252,1 262896 269147 /usr/lib64/libjpeg.so.62.0.0

java 1294 root mem REG 252,1 41400 792676 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libjavajpeg.so

java 1294 root mem REG 252,1 644072 266782 /usr/lib64/libfreetype.so.6.3.22

java 1294 root mem REG 252,1 349032 792667 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libfontmanager.so

java 1294 root mem REG 252,1 29072 792665 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libawt_headless.so

java 1294 root mem REG 252,1 715224 792664 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libawt.so

java 1294 root mem REG 252,1 111440 656920 /lib64/libresolv-2.12.so

java 1294 root mem REG 252,1 27896 655389 /lib64/libnss_dns-2.12.so

java 1294 root mem REG 252,1 11920 131997 /var/cache/fontconfig/beeeeb3dfe132a8a0633a017c99ce0c0-le64.cache-3

java 1294 root mem REG 252,1 3203275 792699 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/charsets.jar

java 1294 root mem REG 252,1 3509512 792747 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/resources.jar

java 1294 root mem REG 252,1 477712 655369 /lib64/libfreeblpriv3.so

java 1294 root mem REG 252,1 248720 655363 /lib64/libnspr4.so

java 1294 root mem REG 252,1 18720 655370 /lib64/libplc4.so

java 1294 root mem REG 252,1 14528 655377 /lib64/libplds4.so

java 1294 root mem REG 252,1 191928 266783 /usr/lib64/libnssutil3.so

java 1294 root mem REG 252,1 1337168 268947 /usr/lib64/libnss3.so

............

java 2085 root cwd DIR 252,17 4096 2621998 /data/apache-tomcat-9.0.13/bin

java 2085 root rtd DIR 252,1 4096 2 /

java 2085 root txt REG 252,1 5128 917742 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/bin/java

java 2085 root mem REG 252,1 99174448 269459 /usr/lib/locale/locale-archive

java 2085 root mem REG 252,1 111440 656920 /lib64/libresolv-2.12.so

java 2085 root mem REG 252,1 27896 655389 /lib64/libnss_dns-2.12.so

java 2085 root mem REG 252,1 3203275 792699 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/charsets.jar

java 2085 root mem REG 252,1 3509512 792747 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/resources.jar

java 2085 root mem REG 252,1 477712 655369 /lib64/libfreeblpriv3.so

java 2085 root mem REG 252,1 248720 655363 /lib64/libnspr4.so

java 2085 root mem REG 252,1 18720 655370 /lib64/libplc4.so

java 2085 root mem REG 252,1 14528 655377 /lib64/libplds4.so

java 2085 root mem REG 252,1 191928 266783 /usr/lib64/libnssutil3.so

java 2085 root mem REG 252,1 1337168 268947 /usr/lib64/libnss3.so

java 2085 root mem REG 252,1 185368 266802 /usr/lib64/libsmime3.so

java 2085 root mem REG 252,1 336472 269139 /usr/lib64/libssl3.so

java 2085 root mem REG 252,1 45720 792689 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libsunec.so

java 2085 root mem REG 252,1 36088 792682 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libmanagement.so

java 2085 root mem REG 252,1 98280 792684 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libnet.so

java 2085 root mem REG 252,1 73416 792685 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libnio.so

java 2085 root mem REG 252,17 34918 2622001 /data/apache-tomcat-9.0.13/bin/bootstrap.jar

java 2085 root mem REG 252,1 73280094 792748 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/rt.jar

java 2085 root mem REG 252,1 298029 792717 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/ext/sunjce_provider.jar

............

java 12808 root cwd DIR 252,1 4096 393217 /root

java 12808 root rtd DIR 252,1 4096 2 /

java 12808 root txt REG 252,1 5128 917742 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/bin/java

java 12808 root mem REG 252,1 99174448 269459 /usr/lib/locale/locale-archive

java 12808 root mem REG 252,1 111440 656920 /lib64/libresolv-2.12.so

java 12808 root mem REG 252,1 27896 655389 /lib64/libnss_dns-2.12.so

java 12808 root mem REG 252,1 3509512 792747 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/resources.jar

java 12808 root mem REG 252,1 477712 655369 /lib64/libfreeblpriv3.so

java 12808 root mem REG 252,1 248720 655363 /lib64/libnspr4.so

java 12808 root mem REG 252,1 18720 655370 /lib64/libplc4.so

java 12808 root mem REG 252,1 3203275 792699 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/charsets.jar

java 12808 root mem REG 252,1 14528 655377 /lib64/libplds4.so

java 12808 root mem REG 252,1 191928 266783 /usr/lib64/libnssutil3.so

java 12808 root mem REG 252,1 1337168 268947 /usr/lib64/libnss3.so

java 12808 root mem REG 252,1 185368 266802 /usr/lib64/libsmime3.so

java 12808 root mem REG 252,1 336472 269139 /usr/lib64/libssl3.so

java 12808 root mem REG 252,1 45720 792689 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libsunec.so

java 12808 root mem REG 252,1 36088 792682 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libmanagement.so

java 12808 root mem REG 252,1 98280 792684 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libnet.so

java 12808 root mem REG 252,1 73416 792685 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libnio.so

..........

java 19392 root cwd DIR 252,1 4096 393217 /root

java 19392 root rtd DIR 252,1 4096 2 /

java 19392 root txt REG 252,1 5128 917742 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/bin/java

java 19392 root mem REG 252,1 262896 269147 /usr/lib64/libjpeg.so.62.0.0

java 19392 root mem REG 252,1 41400 792676 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libjavajpeg.so

java 19392 root mem REG 252,1 644072 266782 /usr/lib64/libfreetype.so.6.3.22

java 19392 root mem REG 252,1 349032 792667 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libfontmanager.so

java 19392 root mem REG 252,1 29072 792665 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libawt_headless.so

java 19392 root mem REG 252,1 715224 792664 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libawt.so

java 19392 root mem REG 252,1 99174448 269459 /usr/lib/locale/locale-archive

java 19392 root mem REG 252,1 111440 656920 /lib64/libresolv-2.12.so

java 19392 root mem REG 252,1 27896 655389 /lib64/libnss_dns-2.12.so

java 19392 root mem REG 252,1 11920 131997 /var/cache/fontconfig/beeeeb3dfe132a8a0633a017c99ce0c0-le64.cache-3

java 19392 root mem REG 252,1 3203275 792699 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/charsets.jar

java 19392 root mem REG 252,1 3509512 792747 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/resources.jar

java 19392 root mem REG 252,1 477712 655369 /lib64/libfreeblpriv3.so

java 19392 root mem REG 252,1 248720 655363 /lib64/libnspr4.so

java 19392 root mem REG 252,1 18720 655370 /lib64/libplc4.so

java 19392 root mem REG 252,1 14528 655377 /lib64/libplds4.so

java 19392 root mem REG 252,1 191928 266783 /usr/lib64/libnssutil3.so

...........

java 19838 root cwd DIR 252,1 4096 393217 /root

java 19838 root rtd DIR 252,1 4096 2 /

java 19838 root txt REG 252,1 5128 917742 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/bin/java

java 19838 root mem REG 252,1 99174448 269459 /usr/lib/locale/locale-archive

java 19838 root mem REG 252,1 262896 269147 /usr/lib64/libjpeg.so.62.0.0

java 19838 root mem REG 252,1 41400 792676 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libjavajpeg.so

java 19838 root mem REG 252,1 644072 266782 /usr/lib64/libfreetype.so.6.3.22

java 19838 root mem REG 252,1 349032 792667 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libfontmanager.so

java 19838 root mem REG 252,1 29072 792665 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libawt_headless.so

java 19838 root mem REG 252,1 715224 792664 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libawt.so

java 19838 root mem REG 252,1 11920 131997 /var/cache/fontconfig/beeeeb3dfe132a8a0633a017c99ce0c0-le64.cache-3

java 19838 root mem REG 252,1 111440 656920 /lib64/libresolv-2.12.so

java 19838 root mem REG 252,1 27896 655389 /lib64/libnss_dns-2.12.so

java 19838 root mem REG 252,1 3203275 792699 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/charsets.jar

java 19838 root mem REG 252,1 3509512 792747 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/resources.jar

java 19838 root mem REG 252,1 477712 655369 /lib64/libfreeblpriv3.so

java 19838 root mem REG 252,1 248720 655363 /lib64/libnspr4.so

java 19838 root mem REG 252,1 18720 655370 /lib64/libplc4.so

java 19838 root mem REG 252,1 14528 655377 /lib64/libplds4.so

.........

java 21543 root cwd DIR 252,1 4096 393217 /root

java 21543 root rtd DIR 252,1 4096 2 /

java 21543 root txt REG 252,1 5128 917742 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/bin/java

java 21543 root mem REG 252,1 262896 269147 /usr/lib64/libjpeg.so.62.0.0

java 21543 root mem REG 252,1 41400 792676 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libjavajpeg.so

java 21543 root mem REG 252,1 644072 266782 /usr/lib64/libfreetype.so.6.3.22

java 21543 root mem REG 252,1 349032 792667 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libfontmanager.so

java 21543 root mem REG 252,1 29072 792665 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libawt_headless.so

java 21543 root mem REG 252,1 715224 792664 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libawt.so

java 21543 root mem REG 252,1 111440 656920 /lib64/libresolv-2.12.so

java 21543 root mem REG 252,1 27896 655389 /lib64/libnss_dns-2.12.so

java 21543 root mem REG 252,1 3509512 792747 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/resources.jar

java 21543 root mem REG 252,1 3203275 792699 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/charsets.jar

java 21543 root mem REG 252,1 11920 131997 /var/cache/fontconfig/beeeeb3dfe132a8a0633a017c99ce0c0-le64.cache-3

java 21543 root mem REG 252,1 477712 655369 /lib64/libfreeblpriv3.so

java 21543 root mem REG 252,1 248720 655363 /lib64/libnspr4.so

java 21543 root mem REG 252,1 18720 655370 /lib64/libplc4.so

java 21543 root mem REG 252,1 14528 655377 /lib64/libplds4.so

java 21543 root mem REG 252,1 191928 266783 /usr/lib64/libnssutil3.so

........

java 22750 root cwd DIR 252,1 4096 393217 /root

java 22750 root rtd DIR 252,1 4096 2 /

java 22750 root txt REG 252,1 5128 917742 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/bin/java

java 22750 root mem REG 252,1 262896 269147 /usr/lib64/libjpeg.so.62.0.0

java 22750 root mem REG 252,1 41400 792676 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libjavajpeg.so

java 22750 root mem REG 252,1 644072 266782 /usr/lib64/libfreetype.so.6.3.22

java 22750 root mem REG 252,1 349032 792667 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libfontmanager.so

java 22750 root mem REG 252,1 29072 792665 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libawt_headless.so

java 22750 root mem REG 252,1 715224 792664 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libawt.so

java 22750 root mem REG 252,1 111440 656920 /lib64/libresolv-2.12.so

java 22750 root mem REG 252,1 27896 655389 /lib64/libnss_dns-2.12.so

java 22750 root mem REG 252,1 11920 131997 /var/cache/fontconfig/beeeeb3dfe132a8a0633a017c99ce0c0-le64.cache-3

java 22750 root mem REG 252,1 3203275 792699 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/charsets.jar

java 22750 root mem REG 252,1 3509512 792747 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/resources.jar

java 22750 root mem REG 252,1 477712 655369 /lib64/libfreeblpriv3.so

java 22750 root mem REG 252,1 248720 655363 /lib64/libnspr4.so

........

java 29458 root cwd DIR 252,1 4096 393217 /root

java 29458 root rtd DIR 252,1 4096 2 /

java 29458 root txt REG 252,1 5128 917742 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/bin/java

java 29458 root mem REG 252,1 99174448 269459 /usr/lib/locale/locale-archive

java 29458 root mem REG 252,1 262896 269147 /usr/lib64/libjpeg.so.62.0.0

java 29458 root mem REG 252,1 41400 792676 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libjavajpeg.so

java 29458 root mem REG 252,1 644072 266782 /usr/lib64/libfreetype.so.6.3.22

java 29458 root mem REG 252,1 349032 792667 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libfontmanager.so

java 29458 root mem REG 252,1 29072 792665 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libawt_headless.so

java 29458 root mem REG 252,1 715224 792664 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.191.b12-0.el6_10.x86_64/jre/lib/amd64/libawt.so

java 29458 root mem REG 252,1 11920 131997 /var/cache/fontconfig/beeeeb3dfe132a8a0633a017c99ce0c0-le64.cache-3

............

java 29458 root 235u IPv4 34489969 0t0 TCP localhost:57037->localhost:mysql (ESTABLISHED)

java 29458 root 236u IPv4 34489971 0t0 TCP localhost:57036->localhost:mysql (ESTABLISHED)

java 29458 root 237u IPv4 34489970 0t0 TCP localhost:57040->localhost:mysql (ESTABLISHED)

java 29458 root 238u IPv4 34489982 0t0 TCP localhost:57042->localhost:mysql (ESTABLISHED)

java 29458 root 239u IPv4 34489983 0t0 TCP localhost:57043->localhost:mysql (ESTABLISHED)

java 29458 root 240u IPv4 34489984 0t0 TCP localhost:57046->localhost:mysql (ESTABLISHED)

通过上图所示：正常运行的Tomcat状态应为PID:29458的java进程

3、杀掉其他的java的进程

kill -9 PID