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From "Marvin S. Addison" <marvin.addi...@gmail.com>
Subject Re: High CPU with Tomcat 7.0.26 & 6.0.35
Date Wed, 11 Apr 2012 13:30:52 GMT
>      "http-443-205" daemon prio=10 tid=0x096a8400 nid=0x2a04 runnable [0x3089d000..0x3089e130]
>         java.lang.Thread.State: RUNNABLE
>          at org.apache.tomcat.jni.Socket.sendbb(Native Method)
>          at org.apache.coyote.http11.InternalAprOutputBuffer.flushBuffer(InternalAprOutputBuffer.java:711)
>          at org.apache.coyote.http11.InternalAprOutputBuffer$SocketOutputBuffer.doWrite(InternalAprOutputBuffer.java:742)
>          at org.apache.coyote.http11.filters.IdentityOutputFilter.doWrite(IdentityOutputFilter.java:127)
>          at org.apache.coyote.http11.InternalAprOutputBuffer.doWrite(InternalAprOutputBuffer.java:552)
>          at org.apache.coyote.Response.doWrite(Response.java:560)

We saw the same pattern as above in thread dumps from our hosts 
exhibiting CPU spikes, but with a notable exception.  In our case 
whenever we captured traces, we saw at least _two_ threads in RUNNABLE 
state at org.apache.tomcat.jni.Socket.sendbb().  There was also some 
evidence that the number of threads in that state correlated with the 
severity of the CPU spike.

M

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