tomcat占用内存CPU过高原因排查

2017-11-3012:34:37tomcat占用内存CPU过高原因排查已关闭评论 2,304
1.查看tomcat进程号
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ps -ef |grep tomcat
2.查看占用资源高的线程号
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top -H -p pid
<M,按使用内存倒序排列；P按照CPU使用率倒序>
3.将线程号转换成16进制
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printf "%x\n" treadid
4.jstack查找对应代码段
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jstack pid |grep `printf "%x\n" treadid` -A 30
-A 显示关键字之后的行数

-B 显示关键字之前的行数

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   java.lang.Thread.State: RUNNABLE
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.socketRead(SocketInputStream.java:116)
at java.net.SocketInputStream.read(SocketInputStream.java:170)
at java.net.SocketInputStream.read(SocketInputStream.java:141)
at com.mysql.jdbc.util.ReadAheadInputStream.readFromUnderlyingStreamIfNecessary(ReadAheadInputStream.java:158)
at com.mysql.jdbc.util.ReadAheadInputStream.read(ReadAheadInputStream.java:189)
- locked &lt;0x00000007067c18c8&gt; (a com.mysql.jdbc.util.ReadAheadInputStream)
at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:3163)
at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3676)
at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3609)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4160)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:928)
at com.mysql.jdbc.MysqlIO.nextRow(MysqlIO.java:2053)
at com.mysql.jdbc.MysqlIO.readSingleRowSet(MysqlIO.java:3554)
at com.mysql.jdbc.MysqlIO.getResultSet(MysqlIO.java:491)
at com.mysql.jdbc.MysqlIO.readResultsForQueryOrUpdate(MysqlIO.java:3245)
at com.mysql.jdbc.MysqlIO.readAllResults(MysqlIO.java:2413)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2836)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2825)
- locked &lt;0x000000070b3849b8&gt; (a com.mysql.jdbc.JDBC4Connection)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2156)
- locked &lt;0x000000070b3849b8&gt; (a com.mysql.jdbc.JDBC4Connection)
at com.mysql.jdbc.PreparedStatement.execute(PreparedStatement.java:1379)
- locked &lt;0x000000070b3849b8&gt; (a com.mysql.jdbc.JDBC4Connection)
at com.alibaba.druid.filter.FilterChainImpl.preparedStatement_execute(FilterChainImpl.java:2931)
at com.alibaba.druid.filter.FilterEventAdapter.preparedStatement_execute(FilterEventAdapter.java:440)
at com.alibaba.druid.filter.FilterChainImpl.preparedStatement_execute(FilterChainImpl.java:2929)
at com.alibaba.druid.proxy.jdbc.PreparedStatementProxyImpl.execute(PreparedStatementProxyImpl.java:118)
at com.alibaba.druid.pool.DruidPooledPreparedStatement.execute(DruidPooledPreparedStatement.java:493)

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