Re: [boost] Logging library

From: John Torjo (john.groups_at_[hidden])
Date: 2007-11-01 09:18:27

>> Note that logging can also become way faster if you do it on a dedicated
>> thread (on_dedicated_thread.hpp class). I haven't yet tested this, but
>> it's gonna be way faster than doing logging on the thread the message is
>> logged. Basically, the only thing that happens in the current thread is
>> gathering the message. Writing it (formatting it and then writing it to
>> the destination(s)) will happen on the other thread.
>> Thus, any destination you might have - can automatically become
>> asynchronous as well ;) )
>>     
> Yah, log4cxx and my logger also support async logging.  But this is not 
> possible where I work (large financial).  If use async logging, you have 
> a queue between your app thread and the logging thread.  If your app 
> crashes, anything in that queue is lost.  This is hell on wheels for 
> debugging.   Plus some important information is lost ("Oops! We don't 
> know which of the $30 million in trades were sent to the market and which 
> weren't!").  So while I know Async logging is faster, it is not practical 
> in any important application.
>
>   
He he ;) Good point. Well, you can do something like this:
- sync logging into a memory drive (thus, if app crashes, you can still 
read the drive) - this, in a rather raw form (not much formatting),
- and async logging to other destination(s) - files, http, mail, 
whatever; with all the pretty formatting you wish
>> (note : your appenders = my destinations)
>>
>> I'd be curious to see how my lib benchmarks against what solution your
>> company took ;)
>>     
> I will see if I can grab your logger and benchmark it against mine - 
> first using generic formatters, then using custom formatters (which 
> increase efficiency dramatically).
>   
Coolio ;)

Best,
John
> PreZ :)
>
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