[kea-dev] Loggers and immediate flush

[Chaigneau, Nicolas]

Hello,


I have a suggestion concerning Kea logging implementation.



>From what I understand, options for log4cplus are handled in OutputOption.
These options contain a member "flush", which is used to set the following property of log4cplus FileAppender:

	ImmediateFlush
	When it is set true, output stream will be flushed after each appended event.

But it is always set to true.

I would like to be able to set this parameter for a given logger through Kea configuration file.



Why we need this:


We're using a dedicated logger to log each DHCP packet received, and I've noticed:
- first, this has a significant impact on Kea performances (which is expected)
- but this can be alleviated by disabling "ImmediateFlush" (I tested this by forcing "flush" to false in OutputOption constructor).

Preliminary benchmark tests show that doing so results in a performance gain of about 15-20%, which is significant.



I'll open a ticket to track this.



Regards,
Nicolas.

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