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+uvm_set_default_sequence=*,run_phase is causing two threads to spawn

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I am running the UVM 1.2 examples code given in following link, which are there to demonstrate the UVM 1.2 new features.




In the above code, the default sequence code can be controlled from command line with following code.


If i use run_phase instead of main_phase, to control the default sequence, then same sequence will run twice instead of one.


Two sequence threads are getting spawned parallelly, if i use run_phase to control default sequence.


I am expecting the behavior should be same whether i use run/main_phase. Not able to figure it out, why different behaviors are seen? 

This behavior is seen with UVM 1.2.

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