[SPDK] Performance of spdk_trace

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Hi there,

During my daily use I found the tracing system of SPDK and spdk_trace_record
very low overhead. So I=E2=80=99m planning to port to other applications wh=
ere it
might generate several 100K events per second. I think such a speed should
be normal for SPDK applications. Have you ever measured how many events per
second is spdk_trace able to handle?

Thanks!

Jinhao Fan
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