what do I specify for the argument --rank when linking the traces on single node single gpu?

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I am testing my chakra environment following the steps in wiki. when I link the pytorch trace and kineto trace, with the cmd
"chakra_trace_link --chakra-host-trace pytorch_et.json --chakra-device-trace kineto_trace.json --output-file /path/to/chakra_host_device_trace.json ",
I got
"chakra_trace_link: error: the following arguments are required: --rank".
But my host trace and kineto trace are collected in my node with single GPU and without DDP, then what I can provide for the rank argument?
look forward for any advice.