[logback-dev] synchronization style?

[Ceki Gulcu]

Joern Huxhorn wrote:

> Nope, a discussion like that is really necessary because this whole
> issue is pretty crucial and will essentially decide how well Logback
> will perform in environments with >1 CPU-cores.
> This will become more and more important with more cores added in every
> new CPU generation. The more cores are present, the more relevant the
> issue of unfairness will become, since waiting threads will  mean idling
> CPUs.

While open to further investigation and new data, evidence collected
indicates that threads in Sun's JDK on multi-core CPU
on Linux as well as other platforms can make other threads
starve but that is *not* a logback issue. Moreover, it would be unfair to
penalize *all* logback users using fair locking which is much slower
than synchronization or unfair locks.

As a side note, and if my memory serves me well, you gather caller
data for every log call which can have significant impact on
performance. Are you collecting caller data?

> Regards,
> Joern.


-- 
Ceki Gülcü
Logback: The reliable, generic, fast and flexible logging framework for Java.
http://logback.qos.ch