How to set up drain time properly?

UVM
1

I am writing a testbench and have to set up an appropriate drain time for it. The time required by the dut to process the input sequences greatly depends on how many sequences I drive in, and the time to process the remaining transactions in the dut after the last sequence is sent in varies. How can I make the simulation stop at a specific condition like

if( output_pkt_no == some_value)
stop_simulation

And in which component of the testbench should I make changes?

2

I think more context might be needed to get a better suggestion, but I would assume you start your sequences in uvm_test class in main_phase, then one suggestion is adding your condition in a later phase like shutdown_phase

class test extends uvm_test;

  // ...
  
  task main_phase(uvm_phase phase);
    phase.raise_objection(this);
    // Start sequences
    phase.drop_objection(this)
   endtask

  task shutdown_phase(uvm_phase phase);
    phase.raise_objection(this);
    wait(/*condition*/);
    phase.drop_objection(this);
  endtask

endclass
3

Needs little more elaboration for your use case.