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From robert burrell donkin <robertburrelldon...@blueyonder.co.uk>
Subject Re: [logging] interesting performance figures
Date Tue, 21 Feb 2006 21:16:21 GMT
On Tue, 2006-02-21 at 20:51 +0000, robert burrell donkin wrote:
> On Tue, 2006-02-21 at 00:42 +0100, Remy Maucherat wrote:
> > On 2/21/06, robert burrell donkin <robertburrelldonkin@blueyonder.co.uk> wrote:
> > > i've been running some performance tests: the aim being to check how
> > > much slower JCL 1.1 runs that the 1.0.x releases. the figures for log4j
> > > are interesting. the raw data is below (the percentages are normalised
> > > to 1.0.4 benchmark times).
> > >
> > > 1. there is a small performance degradation between the 1.0.3, 1.0.4 and
> > > 1.1RC5 but not significant (a few percentiles).
> > > 2. 1.0.2 is a *lot* faster for log4j that the later releases
> > > 3. isDebugEnabled is a *lot* faster than logging
> > > 4. getLog is *slow*
> > >
> > > i have some ideas for improving performance against log4j (but testing
> > > them will have to wait till tomorrow).
> > 
> > As long as isDebugEnabled is fast, I'm happy. In most cases, debug
> > level will mean logging a ton of things, so will be slow (of course,
> > people have complained that TC was too slow with debug logging). 
> 
> i probably should have mentioned that the tests were for debugging to a
> disabled category/logger (whichever nomenclature you prefer): something
> smells bad :-/

and it was my configuration: log4j is *very* slow which it's not
explicitly configured. with a log4j file, the figures are pretty much
what i'd expect. that's a relief :)

i'm not sure why JCL 1.0.2 is quicker a configuration file. it does use
category (rather than logger)...

- robert


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