[jboss-dev-forums] [Design of Messaging on JBoss (Messaging/JBoss)] - Re: log.isTraceEnabled() and performance

[timfox]

"clebert.suconic at jboss.com" wrote : 
  | Still better to not call it when trace is not set IMO.

Yes, log.isTraceEnabled() has a significant overhead.

Actually in JBM 1.4 approx 3% of time was spent in log.isTraceEnabled() calls until we changed it to check a static flag "trace"! (Admittedly we had a lot of log.isTraceEnabled() calls).

Moral of the story: Don't assume that log.isTraceEnabled() (or log.isDebugEnabled()) is a fast call, and never put it in performance critical sections.

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