JSSE 客户端轮询器在 Tomcat 8.5 上的高 CPU 负载

Question

我运行 Tomcat 8.5.3 Windows Server 2008R2 和 Java 1.8.0_92。该过程消耗了大量 CPU（4 CPU 秒中约占 50%）。

JTop 显示，到目前为止，消耗最多的两个线程是 https-jsse-nio-443-ClientPoller-0 和 https-jsse-nio-443-ClientPoller-1。

线程主要在这四个堆栈跟踪上循环：

sun.nio.ch.WindowsSelectorImpl$SubSelector.poll0(Native Method)
sun.nio.ch.WindowsSelectorImpl$SubSelector.poll(WindowsSelectorImpl.java:296)
sun.nio.ch.WindowsSelectorImpl$SubSelector.access0(WindowsSelectorImpl.java:278)
sun.nio.ch.WindowsSelectorImpl.doSelect(WindowsSelectorImpl.java:159)
sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86)
   - locked sun.nio.ch.Util@2a3e6629
   - locked java.util.Collections$UnmodifiableSet@7cdb1cd3
   - locked sun.nio.ch.WindowsSelectorImpl@13dc3a00
sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97)
org.apache.tomcat.util.net.NioEndpoint$Poller.run(NioEndpoint.java:791)
java.lang.Thread.run(Thread.java:745)

.

sun.nio.ch.WindowsSelectorImpl$SubSelector.processFDSet(WindowsSelectorImpl.java:345)
sun.nio.ch.WindowsSelectorImpl$SubSelector.processSelectedKeys(WindowsSelectorImpl.java:315)
sun.nio.ch.WindowsSelectorImpl$SubSelector.access00(WindowsSelectorImpl.java:278)
sun.nio.ch.WindowsSelectorImpl.updateSelectedKeys(WindowsSelectorImpl.java:495)
sun.nio.ch.WindowsSelectorImpl.doSelect(WindowsSelectorImpl.java:172)
sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86)
   - locked sun.nio.ch.Util@6f4350d0
   - locked java.util.Collections$UnmodifiableSet@36157c3f
   - locked sun.nio.ch.WindowsSelectorImpl@120cc3aa
sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97)
org.apache.tomcat.util.net.NioEndpoint$Poller.run(NioEndpoint.java:791)
    java.lang.Thread.run(Thread.java:745)

.

sun.nio.ch.WindowsSelectorImpl.resetWakeupSocket0(Native Method)
sun.nio.ch.WindowsSelectorImpl.resetWakeupSocket(WindowsSelectorImpl.java:473)
   - locked java.lang.Object@450e5040
sun.nio.ch.WindowsSelectorImpl.doSelect(WindowsSelectorImpl.java:174)
sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86)
   - locked sun.nio.ch.Util@6f4350d0
   - locked java.util.Collections$UnmodifiableSet@36157c3f
   - locked sun.nio.ch.WindowsSelectorImpl@120cc3aa
sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97)
org.apache.tomcat.util.net.NioEndpoint$Poller.run(NioEndpoint.java:791)
java.lang.Thread.run(Thread.java:745)

.

java.lang.Object.notifyAll(Native Method)
sun.nio.ch.WindowsSelectorImpl$StartLock.startThreads(WindowsSelectorImpl.java:189)
   - locked sun.nio.ch.WindowsSelectorImpl$StartLock@1c512d03
sun.nio.ch.WindowsSelectorImpl$StartLock.access0(WindowsSelectorImpl.java:181)
sun.nio.ch.WindowsSelectorImpl.doSelect(WindowsSelectorImpl.java:153)
sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86)
   - locked sun.nio.ch.Util@2a3e6629
   - locked java.util.Collections$UnmodifiableSet@7cdb1cd3
   - locked sun.nio.ch.WindowsSelectorImpl@13dc3a00
sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97)
org.apache.tomcat.util.net.NioEndpoint$Poller.run(NioEndpoint.java:791)
java.lang.Thread.run(Thread.java:745)

有什么想法吗？

Answer 1

我在 Tomcat 8.5.4 / Linux 上遇到了类似的问题，我看到 cpu 在轮询线程上的使用率非常高（例如 https-jsse-nio-443 -ClientPoller-0 和 1）。升级到 8.5.5 似乎已经解决了这个问题。

可能是这个错误：https://bz.apache.org/bugzilla/show_bug.cgi?id=60030

JSSE 客户端轮询器在 Tomcat 8.5 上的高 CPU 负载

High CPU load with the JSSE client poller on Tomcat 8.5

java

tomcat

cpu-usage