Re: [boost] Some simple logging performance tests

From: Andrew Schweitzer (a.schweitzer.grps_at_[hidden])
Date: 2005-11-15 09:08:28

Whoops!

Those were debug build numbers. Here's release build numbers.

These and the debug tests are is vc7.1, using whatever optimization 
settings the default project contains. Again, I think these tests are 
just a quick check, not a thorough investigation. I'll try to post the 
actual test code tomorrow.

results:
                elapsed ms 	thread time ms		ns / call 	
cout		10981		343 			34300
enabled log	1281		203			20300
cout "disabled"	0		0			0
cout "dis" func	16		15			15
disabled log	16		15			15	

In release build, I believe my contrived cout "disabled" test was 
optimized away. When replaced with a function call it seems to be same 
speed as disabled log:
//in another file:
        bool UseCout(){return false;}
        
//outside loop:
        extern bool UseCout();

//in loop:
        if(UseCout())
        {
                cout << l_dw << endl;
        }

Andrew Schweitzer wrote:
[snip]
> 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 			
> cout		1329		421 			42100
> enabled log	1469		453			45300
> cout "disabled"15		15			15
> disabled log	531		531			531	
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