How to change verbsity for particular component in UVM

There are two ways to set/control/change verbosity of particular component. 

1. Using method call 
2. Through Command line

Here I explained both using example.

Let's go through examples.

1. Using method call

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	`include "uvm.svh"
	import uvm_pkg::*;
	class rpting extends uvm_component;
	`uvm_component_utils(rpting)
	function new(string name,uvm_component parent);
	super.new(name, parent);
	endfunction : new
	task run();
	`uvm_info(get_full_name(),"Info Message : Verbo lvl - UVM_NONE ",UVM_NONE)
	`uvm_info(get_full_name(),"Info Message : Verbo lvl - UVM_LOW ",UVM_LOW)
	`uvm_info(get_full_name(),"Info Message : Verbo lvl - UVM_MEDIUM",UVM_MEDIUM)
	`uvm_warning(get_full_name(),"Warning Messgae from rpting")
	`uvm_error(get_full_name(),"Error Message from rpting \n\n")
	endtask : run
	endclass : rpting
	module top;
	rpting rpt1;
	rpting rpt2;
	rpting rpt3;
	initial begin
	rpt1 = new("rpt1",null);
	rpt2 = new("rpt2",null);
	rpt3 = new("rpt3",null);
	rpt1.set_report_verbosity_level(UVM_MEDIUM);
	rpt2.set_report_verbosity_level(UVM_LOW);
	rpt3.set_report_verbosity_level(UVM_NONE);
	run_test();
	end
	endmodule : top
	//Output:
	// UVM_INFO @ 0: reporter [RNTST] Running test ...
	// UVM_INFO top1.sv(19) @ 0: rpt1 [rpt1] Info Message : Verbo lvl - UVM_NONE
	// UVM_INFO top1.sv(20) @ 0: rpt1 [rpt1] Info Message : Verbo lvl - UVM_LOW
	// UVM_INFO top1.sv(21) @ 0: rpt1 [rpt1] Info Message : Verbo lvl - UVM_MEDIUM
	// UVM_WARNING top1.sv(22) @ 0: rpt1 [rpt1] Warning Messgae from rpting
	// UVM_ERROR top1.sv(23) @ 0: rpt1 [rpt1] Error Message from rpting
	//
	//
	// UVM_INFO top1.sv(19) @ 0: rpt2 [rpt2] Info Message : Verbo lvl - UVM_NONE
	// UVM_INFO top1.sv(20) @ 0: rpt2 [rpt2] Info Message : Verbo lvl - UVM_LOW
	// UVM_WARNING top1.sv(22) @ 0: rpt2 [rpt2] Warning Messgae from rpting
	// UVM_ERROR top1.sv(23) @ 0: rpt2 [rpt2] Error Message from rpting
	//
	//
	// UVM_INFO top1.sv(19) @ 0: rpt3 [rpt3] Info Message : Verbo lvl - UVM_NONE
	// UVM_WARNING top1.sv(22) @ 0: rpt3 [rpt3] Warning Messgae from rpting
	// UVM_ERROR top1.sv(23) @ 0: rpt3 [rpt3] Error Message from rpting

view raw set_verbosity_1.sv hosted with ❤ by GitHub

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2. Through Command line

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	`include "uvm.svh"
	import uvm_pkg::*;
	class my_env extends uvm_env;
	`uvm_component_utils(my_env)
	function new(string name,uvm_component parent);
	super.new(name, parent);
	endfunction : new
	task run();
	`uvm_info(get_full_name(),"Info Message : Verbo lvl - UVM_NONE ",UVM_NONE)
	`uvm_info(get_full_name(),"Info Message : Verbo lvl - UVM_LOW ",UVM_LOW)
	`uvm_info(get_full_name(),"Info Message : Verbo lvl - UVM_MEDIUM",UVM_MEDIUM)
	`uvm_warning(get_full_name(),"Warning Messgae from my_test")
	`uvm_error(get_full_name(),"Error Message from my_test \n\n")
	endtask : run
	endclass : my_env
	class my_test extends uvm_test;
	`uvm_component_utils(my_test)
	my_env env1, env2;
	function new(string name,uvm_component parent);
	super.new(name, parent);
	endfunction : new
	function void build_phase (uvm_phase phase);
	super.build_phase (phase);
	env1 = my_env :: type_id :: create ("env1", this);
	env2 = my_env :: type_id :: create ("env2", this);
	endfunction : build_phase
	task run();
	`uvm_info(get_full_name(),"Info Message : Verbo lvl - UVM_NONE ",UVM_NONE)
	`uvm_info(get_full_name(),"Info Message : Verbo lvl - UVM_LOW ",UVM_LOW)
	`uvm_info(get_full_name(),"Info Message : Verbo lvl - UVM_MEDIUM",UVM_MEDIUM)
	`uvm_warning(get_full_name(),"Warning Messgae from my_test")
	`uvm_error(get_full_name(),"Error Message from my_test \n\n")
	endtask : run
	endclass : my_test
	module top;
	initial begin
	run_test("my_test");
	end
	endmodule : top

view raw set_verbosity_2.sv hosted with ❤ by GitHub

	`include "uvm.svh"
	import uvm_pkg::*;
	class my_env extends uvm_env;
	`uvm_component_utils(my_env)
	function new(string name,uvm_component parent);
	super.new(name, parent);
	endfunction : new
	task run();
	`uvm_info(get_full_name(),"Info Message : Verbo lvl - UVM_NONE ",UVM_NONE)
	`uvm_info(get_full_name(),"Info Message : Verbo lvl - UVM_LOW ",UVM_LOW)
	`uvm_info(get_full_name(),"Info Message : Verbo lvl - UVM_MEDIUM",UVM_MEDIUM)
	`uvm_warning(get_full_name(),"Warning Messgae from my_test")
	`uvm_error(get_full_name(),"Error Message from my_test \n\n")
	endtask : run
	endclass : my_env
	class my_test extends uvm_test;
	`uvm_component_utils(my_test)
	my_env env1, env2;
	function new(string name,uvm_component parent);
	super.new(name, parent);
	endfunction : new
	function void build_phase (uvm_phase phase);
	super.build_phase (phase);
	env1 = my_env :: type_id :: create ("env1", this);
	env2 = my_env :: type_id :: create ("env2", this);
	endfunction : build_phase
	task run();
	`uvm_info(get_full_name(),"Info Message : Verbo lvl - UVM_NONE ",UVM_NONE)
	`uvm_info(get_full_name(),"Info Message : Verbo lvl - UVM_LOW ",UVM_LOW)
	`uvm_info(get_full_name(),"Info Message : Verbo lvl - UVM_MEDIUM",UVM_MEDIUM)
	`uvm_warning(get_full_name(),"Warning Messgae from my_test")
	`uvm_error(get_full_name(),"Error Message from my_test \n\n")
	endtask : run
	endclass : my_test
	module top;
	initial begin
	run_test("my_test");
	end
	endmodule : top

view raw set_verbosity_2.sv hosted with ❤ by GitHub

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Now run with 3 different simulation commands and see the difference.

+uvm_set_verbosity=component,id,verbosity,phase

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	// Simulation Command:
	// ./simv
	//Output:
	// UVM_INFO @ 0: reporter [RNTST] Running test my_test...
	// UVM_INFO top2.sv(19) @ 0: uvm_test_top.env1 [uvm_test_top.env1] Info Message : Verbo lvl - UVM_NONE
	// UVM_INFO top2.sv(20) @ 0: uvm_test_top.env1 [uvm_test_top.env1] Info Message : Verbo lvl - UVM_LOW
	// UVM_INFO top2.sv(21) @ 0: uvm_test_top.env1 [uvm_test_top.env1] Info Message : Verbo lvl - UVM_MEDIUM
	// UVM_WARNING top2.sv(22) @ 0: uvm_test_top.env1 [uvm_test_top.env1] Warning Messgae from my_test
	// UVM_ERROR top2.sv(23) @ 0: uvm_test_top.env1 [uvm_test_top.env1] Error Message from my_test
	//
	//
	// UVM_INFO top2.sv(19) @ 0: uvm_test_top.env2 [uvm_test_top.env2] Info Message : Verbo lvl - UVM_NONE
	// UVM_INFO top2.sv(20) @ 0: uvm_test_top.env2 [uvm_test_top.env2] Info Message : Verbo lvl - UVM_LOW
	// UVM_INFO top2.sv(21) @ 0: uvm_test_top.env2 [uvm_test_top.env2] Info Message : Verbo lvl - UVM_MEDIUM
	// UVM_WARNING top2.sv(22) @ 0: uvm_test_top.env2 [uvm_test_top.env2] Warning Messgae from my_test
	// UVM_ERROR top2.sv(23) @ 0: uvm_test_top.env2 [uvm_test_top.env2] Error Message from my_test
	//
	//
	// UVM_INFO top2.sv(43) @ 0: uvm_test_top [uvm_test_top] Info Message : Verbo lvl - UVM_NONE
	// UVM_INFO top2.sv(44) @ 0: uvm_test_top [uvm_test_top] Info Message : Verbo lvl - UVM_LOW
	// UVM_INFO top2.sv(45) @ 0: uvm_test_top [uvm_test_top] Info Message : Verbo lvl - UVM_MEDIUM
	// UVM_WARNING top2.sv(46) @ 0: uvm_test_top [uvm_test_top] Warning Messgae from my_test
	// UVM_ERROR top2.sv(47) @ 0: uvm_test_top [uvm_test_top] Error Message from my_test
	//-----------------------------------------------------------------------------------------------------
	//Simulation Command:
	// ./simv +uvm_set_verbosity=uvm_test_top,_ALL_,UVM_LOW,run +uvm_set_verbosity=uvm_test_top.env2,uvm_test_top.env2,UVM_NONE,run, +uvm_set_verbosity=uvm_test_top.env1,_ALL_,UVM_LOW,run
	//Output:
	// UVM_INFO @ 0: reporter [RNTST] Running test my_test...
	// UVM_INFO top2.sv(19) @ 0: uvm_test_top.env1 [uvm_test_top.env1] Info Message : Verbo lvl - UVM_NONE
	// UVM_INFO top2.sv(20) @ 0: uvm_test_top.env1 [uvm_test_top.env1] Info Message : Verbo lvl - UVM_LOW
	// UVM_WARNING top2.sv(22) @ 0: uvm_test_top.env1 [uvm_test_top.env1] Warning Messgae from my_test
	// UVM_ERROR top2.sv(23) @ 0: uvm_test_top.env1 [uvm_test_top.env1] Error Message from my_test
	//
	//
	// UVM_INFO top2.sv(19) @ 0: uvm_test_top.env2 [uvm_test_top.env2] Info Message : Verbo lvl - UVM_NONE
	// UVM_WARNING top2.sv(22) @ 0: uvm_test_top.env2 [uvm_test_top.env2] Warning Messgae from my_test
	// UVM_ERROR top2.sv(23) @ 0: uvm_test_top.env2 [uvm_test_top.env2] Error Message from my_test
	//
	//
	// UVM_INFO top2.sv(43) @ 0: uvm_test_top [uvm_test_top] Info Message : Verbo lvl - UVM_NONE
	// UVM_INFO top2.sv(44) @ 0: uvm_test_top [uvm_test_top] Info Message : Verbo lvl - UVM_LOW
	// UVM_WARNING top2.sv(46) @ 0: uvm_test_top [uvm_test_top] Warning Messgae from my_test
	// UVM_ERROR top2.sv(47) @ 0: uvm_test_top [uvm_test_top] Error Message from my_test
	//-----------------------------------------------------------------------------------------------------
	//Simulation Command:
	// ./simv ./simv +uvm_set_verbosity=*,_ALL_,UVM_LOW,run
	//Output:
	// UVM_INFO @ 0: reporter [RNTST] Running test my_test...
	// UVM_INFO top2.sv(19) @ 0: uvm_test_top.env1 [uvm_test_top.env1] Info Message : Verbo lvl - UVM_NONE
	// UVM_INFO top2.sv(20) @ 0: uvm_test_top.env1 [uvm_test_top.env1] Info Message : Verbo lvl - UVM_LOW
	// UVM_WARNING top2.sv(22) @ 0: uvm_test_top.env1 [uvm_test_top.env1] Warning Messgae from my_test
	// UVM_ERROR top2.sv(23) @ 0: uvm_test_top.env1 [uvm_test_top.env1] Error Message from my_test
	//
	//
	// UVM_INFO top2.sv(19) @ 0: uvm_test_top.env2 [uvm_test_top.env2] Info Message : Verbo lvl - UVM_NONE
	// UVM_INFO top2.sv(20) @ 0: uvm_test_top.env2 [uvm_test_top.env2] Info Message : Verbo lvl - UVM_LOW
	// UVM_WARNING top2.sv(22) @ 0: uvm_test_top.env2 [uvm_test_top.env2] Warning Messgae from my_test
	// UVM_ERROR top2.sv(23) @ 0: uvm_test_top.env2 [uvm_test_top.env2] Error Message from my_test
	//
	//
	// UVM_INFO top2.sv(43) @ 0: uvm_test_top [uvm_test_top] Info Message : Verbo lvl - UVM_NONE
	// UVM_INFO top2.sv(44) @ 0: uvm_test_top [uvm_test_top] Info Message : Verbo lvl - UVM_LOW
	// UVM_WARNING top2.sv(46) @ 0: uvm_test_top [uvm_test_top] Warning Messgae from my_test
	// UVM_ERROR top2.sv(47) @ 0: uvm_test_top [uvm_test_top] Error Message from my_test
	// _ALL_ is a "magic" name that can match either all severities or all IDs.

view raw set_verbosity_2_op.sv hosted with ❤ by GitHub

	// Simulation Command:
	// ./simv
	//Output:
	// UVM_INFO @ 0: reporter [RNTST] Running test my_test...
	// UVM_INFO top2.sv(19) @ 0: uvm_test_top.env1 [uvm_test_top.env1] Info Message : Verbo lvl - UVM_NONE
	// UVM_INFO top2.sv(20) @ 0: uvm_test_top.env1 [uvm_test_top.env1] Info Message : Verbo lvl - UVM_LOW
	// UVM_INFO top2.sv(21) @ 0: uvm_test_top.env1 [uvm_test_top.env1] Info Message : Verbo lvl - UVM_MEDIUM
	// UVM_WARNING top2.sv(22) @ 0: uvm_test_top.env1 [uvm_test_top.env1] Warning Messgae from my_test
	// UVM_ERROR top2.sv(23) @ 0: uvm_test_top.env1 [uvm_test_top.env1] Error Message from my_test
	//
	//
	// UVM_INFO top2.sv(19) @ 0: uvm_test_top.env2 [uvm_test_top.env2] Info Message : Verbo lvl - UVM_NONE
	// UVM_INFO top2.sv(20) @ 0: uvm_test_top.env2 [uvm_test_top.env2] Info Message : Verbo lvl - UVM_LOW
	// UVM_INFO top2.sv(21) @ 0: uvm_test_top.env2 [uvm_test_top.env2] Info Message : Verbo lvl - UVM_MEDIUM
	// UVM_WARNING top2.sv(22) @ 0: uvm_test_top.env2 [uvm_test_top.env2] Warning Messgae from my_test
	// UVM_ERROR top2.sv(23) @ 0: uvm_test_top.env2 [uvm_test_top.env2] Error Message from my_test
	//
	//
	// UVM_INFO top2.sv(43) @ 0: uvm_test_top [uvm_test_top] Info Message : Verbo lvl - UVM_NONE
	// UVM_INFO top2.sv(44) @ 0: uvm_test_top [uvm_test_top] Info Message : Verbo lvl - UVM_LOW
	// UVM_INFO top2.sv(45) @ 0: uvm_test_top [uvm_test_top] Info Message : Verbo lvl - UVM_MEDIUM
	// UVM_WARNING top2.sv(46) @ 0: uvm_test_top [uvm_test_top] Warning Messgae from my_test
	// UVM_ERROR top2.sv(47) @ 0: uvm_test_top [uvm_test_top] Error Message from my_test
	//-----------------------------------------------------------------------------------------------------
	//Simulation Command:
	// ./simv +uvm_set_verbosity=uvm_test_top,_ALL_,UVM_LOW,run +uvm_set_verbosity=uvm_test_top.env2,uvm_test_top.env2,UVM_NONE,run, +uvm_set_verbosity=uvm_test_top.env1,_ALL_,UVM_LOW,run
	//Output:
	// UVM_INFO @ 0: reporter [RNTST] Running test my_test...
	// UVM_INFO top2.sv(19) @ 0: uvm_test_top.env1 [uvm_test_top.env1] Info Message : Verbo lvl - UVM_NONE
	// UVM_INFO top2.sv(20) @ 0: uvm_test_top.env1 [uvm_test_top.env1] Info Message : Verbo lvl - UVM_LOW
	// UVM_WARNING top2.sv(22) @ 0: uvm_test_top.env1 [uvm_test_top.env1] Warning Messgae from my_test
	// UVM_ERROR top2.sv(23) @ 0: uvm_test_top.env1 [uvm_test_top.env1] Error Message from my_test
	//
	//
	// UVM_INFO top2.sv(19) @ 0: uvm_test_top.env2 [uvm_test_top.env2] Info Message : Verbo lvl - UVM_NONE
	// UVM_WARNING top2.sv(22) @ 0: uvm_test_top.env2 [uvm_test_top.env2] Warning Messgae from my_test
	// UVM_ERROR top2.sv(23) @ 0: uvm_test_top.env2 [uvm_test_top.env2] Error Message from my_test
	//
	//
	// UVM_INFO top2.sv(43) @ 0: uvm_test_top [uvm_test_top] Info Message : Verbo lvl - UVM_NONE
	// UVM_INFO top2.sv(44) @ 0: uvm_test_top [uvm_test_top] Info Message : Verbo lvl - UVM_LOW
	// UVM_WARNING top2.sv(46) @ 0: uvm_test_top [uvm_test_top] Warning Messgae from my_test
	// UVM_ERROR top2.sv(47) @ 0: uvm_test_top [uvm_test_top] Error Message from my_test
	//-----------------------------------------------------------------------------------------------------
	//Simulation Command:
	// ./simv ./simv +uvm_set_verbosity=*,_ALL_,UVM_LOW,run
	//Output:
	// UVM_INFO @ 0: reporter [RNTST] Running test my_test...
	// UVM_INFO top2.sv(19) @ 0: uvm_test_top.env1 [uvm_test_top.env1] Info Message : Verbo lvl - UVM_NONE
	// UVM_INFO top2.sv(20) @ 0: uvm_test_top.env1 [uvm_test_top.env1] Info Message : Verbo lvl - UVM_LOW
	// UVM_WARNING top2.sv(22) @ 0: uvm_test_top.env1 [uvm_test_top.env1] Warning Messgae from my_test
	// UVM_ERROR top2.sv(23) @ 0: uvm_test_top.env1 [uvm_test_top.env1] Error Message from my_test
	//
	//
	// UVM_INFO top2.sv(19) @ 0: uvm_test_top.env2 [uvm_test_top.env2] Info Message : Verbo lvl - UVM_NONE
	// UVM_INFO top2.sv(20) @ 0: uvm_test_top.env2 [uvm_test_top.env2] Info Message : Verbo lvl - UVM_LOW
	// UVM_WARNING top2.sv(22) @ 0: uvm_test_top.env2 [uvm_test_top.env2] Warning Messgae from my_test
	// UVM_ERROR top2.sv(23) @ 0: uvm_test_top.env2 [uvm_test_top.env2] Error Message from my_test
	//
	//
	// UVM_INFO top2.sv(43) @ 0: uvm_test_top [uvm_test_top] Info Message : Verbo lvl - UVM_NONE
	// UVM_INFO top2.sv(44) @ 0: uvm_test_top [uvm_test_top] Info Message : Verbo lvl - UVM_LOW
	// UVM_WARNING top2.sv(46) @ 0: uvm_test_top [uvm_test_top] Warning Messgae from my_test
	// UVM_ERROR top2.sv(47) @ 0: uvm_test_top [uvm_test_top] Error Message from my_test
	// _ALL_ is a "magic" name that can match either all severities or all IDs.

view raw set_verbosity_2_op.sv hosted with ❤ by GitHub

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Reference:

1. http://www.sunburst-design.com/papers/CummingsSNUG2014AUS_UVM_Messages.pdf

2. http://www.testbench.in/UT_03_UVM_REPORTING.html