[boost] Some simple logging performance tests

From: Andrew Schweitzer (a.schweitzer.grps_at_[hidden])
Date: 2005-11-14 23:26:21

Using GetTickCount and GetThreadTimes on Windows XP Pro, recorded time 
to execute some simple pieces of logging code in a loop. Divided by loop 
iterations to get time per iteration. This is a 3Ghz Pentium. Not sure 
how good these tests are, but here's the results:

results:
                elapsed ms 	thread time ms		ns / call 				(GetTickCount) 
(GetThreadTimes)	(in thread)		
cout		1329		421 			42100
enabled log	1469		453			45300
cout "disabled"	15		15			15
disabled log	531		531			531	

Here's a little detail on tests
cout, 10,000 times, l_dw increments each loop:	
        cout << l_dw << endl;

enabled log, 10,000 times:
        //outside loop:
        enable_logs("lgTest");
        //in loop:
        BOOST_SCOPEDLOG(l_lgTest) << l_dw << endl;

cout "disabled", 1,000,000 times:
        //outside loop:
        bool l_bEnabled = false;	
        //in loop:
        if(l_bEnabled)
        {
                cout << l_dw << endl;
        }

disabled log, 1,000,000 times:
        //outside loop:
        disable_logs("lgTest"); 	//this not in loop
        //in loop:
        BOOST_SCOPEDLOG(l_lgTest) << l_dw << endl;