[Bug] -busbw parameter documented in README but not supported by SimAI_analytical

Description
The README documents the following command using -busbw parameter:

bash
./bin/SimAI_analytical -w example/workload_analytical.txt -g 9216 -g_p_s 8 -r test- -busbw example/busbw.yaml
However, running this command only prints the help message and exits.

Root Cause
After examining the source code in

astra-sim-alibabacloud/astra-sim/system/AstraParamParse.hh
, the parameter parsing logic does not include -busbw. When the parser encounters this unknown argument, it falls into the else { return 1; } branch (line ~169), which triggers the help message output.

The actual supported bandwidth parameters are:

-nv / --nvlink (NVLink bandwidth)
-nic / --nic_busbw (NIC bandwidth)
-n_p_s / --nic_per_server (NICs per server)
Workaround
Use explicit bandwidth parameters instead:

bash
./bin/SimAI_analytical -w example/workload_analytical.txt -g 9216 -g_p_s 8 -r test- -nv 360 -nic 48.5 -n_p_s 8
Expected Behavior
Either:

Add -busbw parameter support to parse the busbw.yaml file, or
Update the README to remove the -busbw example and clarify the correct usage
Environment
OS: Ubuntu (PowerEdge R750)
Compiler: GCC 12.3.0
Branch: main

Start with AstraParamParse.hh, where the documented -busbw argument is rejected, and compare it with the README command and the listed supported bandwidth options. Decide whether the intended resolution is parser support for busbw.yaml or a README correction; done means the documented command behaves consistently with the supported interface.