duhenglucky commented on issue #721: Question About [NOTIFYME]putMessage in lock cost time(ms)=4052 URL: https://github.com/apache/rocketmq/issues/721#issuecomment-457541447 @mm23504570 As you described in this issue, you deployed the RocketMQ broker in a 8 core cpu server, but as the log showed, there are more than 48 sendMessageThread in config, and as RocketMQ used spinlock as default, so you can try to adjust the sendMessageThread num to 8 to prevent more thread was blocked to obtain the spinlock, and this also will decrease you cpu utility. And please pay more attention to your memory usage especially cache usage, please reserve relative more free memory for RocketMQ.
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