Hi，dear.
I have been using lttng to monitor my server these days，but I found something interesting. The cpu usage of lttng varies with the number of cpu cores of the server. On the server, I create a tracing session in live mode, using "lttng create my-session --live". Then,I Start the babeltrace2 and configure it to connect to the relay daemon,using "--input-format=lttng-live" mode. I used 5 cloud servers，1core4G 2core8G 4core16G 8core16G 8core16G. And,the same test script was executed above to provide the same workload. As we all know,lttng has 5 processes, 1.lttng-runas --daemonize 2.lttng-runas -k --consumerd-cmd-sock /var/run/lttng/kconsumerd/command --consumerd-err-sock /var/run/lttng/kconsumerd/error --group tracing 3.lttng-sessiond --daemonize 4.lttng-relayd -L tcp://localhost:5344 5.lttng-consumerd -k --consumerd-cmd-sock /var/run/lttng/kconsumerd/command --consumerd-err-sock /var/run/lttng/kconsumerd/error --group tracing The CPU usage of the first four processes is below 2% on the 5 servers,but the lttng-consumerd process is different. On 1-core、2-core、4-core servers，the CPU usage of the lttng-consumerd process is below 2%. But on two 8-core machines, the cpu usage of the lttng-consumerd process reached 10% or more. And,the cpu usage of the babeltrace process is not much different,just the cpu usage of the lttng-consumerd process varies with the number of cpu cores of the server. Why it is like this？How should this phenomenon be analyzed? Looking forward to your reply. thanks, yuhua
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