Re: ultralog: new concept of logging API
On 1/29/2013 10:57 PM, Mikhail Vladimirov wrote:
1. Garbage-free logging. You can format and send out log message
without allocating any new objects. 2. Lock-free logging. you
can format and send out log message without acquiring any locks.
3. Log message templates are compiled into Java bytecode in run
time or even in compile time, which makes message formatting
really fast.
Any measurements of the impact for some realistic code?
The idea that high-performance application may want to process data
without producing garbage is not something new. Check, for example,
this link: http://oreilly.com/catalog/javapt/chapter/ch04.html
The same could be said about lock-free design. It is well known
approach to increase performance of multi-threaded applications.
Sure.
But did you measure if it actually does result in a significant
difference in performance?
If not then the performance argument is a bit thin.
Ultralog is not the first Java library designed to be garbage- and
lock-free and focused on demands of high performance applications.
See, for example, LMAX Disruptor:
http://lmax-exchange.github.com/disruptor/ It is all about hot to
avoid lock and garbage creation and it states itself as "High
Performance Inter-Thread Messaging Library".
I know about the LMAX Disruptor.
It is not a logging framework.
Ultralog is even not the first attempt to create garbage-free logging
framework for Java. See, for example, the following link:
https://bitbucket.org/vladimir.dolzhenko/gflogger/wiki/Home It
states its goal as "to create ad-hoc logger for low latency (latency
critical) applications (to be precise for latency critical execution
path) which will affect application explicit and implicit (though gc
pauses) as less as it possible". It does not claim itself to be
lock-free though.
What is new in ultralog in comparison with gflogger, is that it
demonstrates that garbage-free logging could be done without
sacrificing code readability.
OK.
But that raises the question: why did that logger fail to achieve
traction?
Arne
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