On Tue, 2006-02-21 at 00:42 +0100, Remy Maucherat wrote: > On 2/21/06, robert burrell donkin <[EMAIL PROTECTED]> 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 :-/ i have an idea what so i'll report back a little later with more information once i have it... > Are the figures similar with JDK logging ? nope :) except for 1.0.2 (which is very, very slow - suggesting an environmental issue), these are the times i would have expected from the test. logging to log4j is about 100 times slower. i'm not as satisfied with these figures (too many erratic values) but here they are anyway: RC5 GetLog: Duration=7324 9661 7329 7318 AVG 7908 ~108% Trace: Duration=50 136 36 36 AVG 64.5 ~178% Debug: Duration=43 25 134 32 AVG 58.5 ~184% isDebugEnabled: Duration=130 17 22 123 AVG 73 ~75% 1.0.4 GetLog: Duration=6873 8574 6861 6871 AVG 7294.75 100% Trace: Duration=37 36 36 36 AVG 36.25 100% Debug: Duration=32 31 32 32 AVG 31.75 100% isDebugEnabled: Duration=122 21 123 122 AVG 97 100% 1.0.3 GetLog: Duration=6921 7006 6919 6906 AVG 6938 ~95% Trace: Duration=136 34 34 135 AVG 84.75 ~234% Debug: Duration=32 32 32 31 AVG 31.75 100% isDebugEnabled: Duration=21 20 21 20 AVG 20.5 21% 1.0.2 GetLog: Duration=6873 6876 6866 6875 AVG 6872.5 ~94% Trace: Duration=28481 28414 28628 28401 AVG 28481 78568% Debug: Duration=28827 28601 29264 31879 AVG 36958.75 116403% isDebugEnabled: Duration=176 21 21 123 AVG 85.25 88% - robert --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
