High CPU in Channels.writeBlocking in JBoss EAP 7.0

Solution Verified - Updated -

Issue

We see high CPU usage in calls like the following:

        at org.xnio.channels.Channels.writeBlocking(Channels.java:97)
        at io.undertow.websockets.jsr.WebSocketSessionRemoteEndpoint$BasicWebSocketSessionRemoteEndpoint.sendText(WebSocketSessionRemoteEndpoint.java:283)
        at org.springframework.web.socket.adapter.standard.StandardWebSocketSession.sendTextMessage(StandardWebSocketSession.java:197)
        at org.springframework.web.socket.adapter.AbstractWebSocketSession.sendMessage(AbstractWebSocketSession.java:104)

Example of high CPU usage:

PID CPU Mem user
28609   97.8%   12.7%   jboss

Environment

  • Red Hat JBoss Enterprise Application Platform (EAP)
    • 7.0.x

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