[logback-user] logback performance clarification
Sebastien Pennec
sebastien at qos.ch
Tue Mar 13 14:10:53 CET 2007
Hello Mandeep,
Thanks for pointing the slide, I'll check it out. Anyway, after the last
optimizations, our parametrized calls are now even faster than log4j's
isDebugEnabled() method... :)
Logback does not fit into commons logging. However, SLF4J provides a jar that
redirects all calls to JCL to SLF4J. If you are using SLF4J with logback, every call
made to the commons logging framework will be directed to logback.
You might be interested in reading the "Gradual migration to SLF4J from Jakarta
Commons Logging (JCL)" part in the SLF4J manual[1]. Calls to log4j can be directed to
logback by using the log4j-bridge module, that is shipped with logback. You can read
about it here[2].
Hope this helps,
Sébastien
[1]http://slf4j.org/manual.html
[2]http://logback.qos.ch/bridge.html
Mandeep Singh wrote:
> Hello Sebastian,
>
> Thanks a lot for ur replies and all the efforts that u have put in into
> this great product. I will surely test this new code. In ur previous
> reply u had asked me the source of my assumption that the parameterized
> call is faster then "isDebugEnabled". Well I misinterpreted the "10
> reasons to use logback" slideshow that is available on the logback site
> .. I am pasting the contents of the slide (Slide number 21) that
> confused me, maybe u can consider rewording it -
>
> Integer entry = new Interger(50);
> logger.debug("The entry is "+entry+".");
> can be optimized as:
> if(logger.isDebugEnabled()) {
> logger.debug("The entry is "+entry+".");
> }
> or better yet:
> logger.debug("The entry is *{}*.", entry);
>
> so u see that the second and third point are not actually related ...:)
>
>
> Also I have another small query , my project uses a mixture of commons
> logging and log4j, also some of the thirdparty libraries that we use,
> are using commons. Where does logback fit in commons ? Can u point me a
> doc which i can refer for the same.
>
> once again thanks for all ur help.
>
> regards
> Mandeep
>
>
>
> ----- Original Message ----
> From: Sebastien Pennec <sebastien at qos.ch>
> To: logback users list <logback-user at qos.ch>
> Sent: Tuesday, March 13, 2007 11:41:16 AM
> Subject: Re: [logback-user] logback performance clarification
>
> Hello Mandeep,
>
> After some research and performance optimizations, here are the results
> I've
> obtained. Times are shown in nanoseconds per requests, and are an
> average time after
> 1'000'000 requests.
>
> Log4j direct debug call: 442
> Log4j tested (isDebugEnabled) debug call: 19
> Logback direct debug call: 435
> Logback tested (isDebugEnabled) debug call: 10
> Logback parametrized debug call: 15
>
> They are rather different than what I had witnessed previously.
>
> First of all, the procedure is closer to a real life example. The
> PerformanceComparator class is nested into a 4-level deep package, and
> not in the top
> package. Then, only the root loggers have a level set explicitly. That
> means that
> both logging frameworks have to include level inheritance when deciding
> to log or not.
>
> This show how logback performs faster than log4j when relying on level
> inheritance.
> The tested call (using isDebugEnabled()) in logback is almost 2 times
> faster than its
> log4j counterpart.
>
> Then, we've made a few optimizations in logback's Logger class. There
> are now less
> method calls, and smarter if statements when recieving the TurboFilter's
> reply. This
> has made the parametrized call much faster. This form is now faster than
> log4j's
> isDebugEnabled() form.
>
> Since TurboFilters are a big feature of logback, I should mention that
> they are
> called when using the direct call or the parametrized call, but also
> when calling
> isDebugEnabled(). For example, you might want to set your levels to INFO
> or WARN in
> production, and add a TurboFilter that sets the level to DEBUG for a
> certain user.
> Having the username in the MDC, you can easily add a TurboFilter that
> will always
> accept the log requests when they are issued by this user's actions,
> although the
> logger would not accept such requests coming from any other user.
> The isDebugEnabled will then return false every time, except when the
> current user is
> logged with the username to allow debug level.
>
> I've attached the class I used to get these results at the end of this
> email. You
> might want to try it on your environment and see if the performance
> satisfy your
> needs. You will need to checkout logback from its source repository[1][2]
>
> Cheers,
>
> Sébastien
>
> [1]http://logback.qos.ch/repos.html
> [2]http://logback.qos.ch/manual/introduction.html#BuildingLogback
>
> package perfTest.ch.qos.logback;
>
> import org.slf4j.Logger;
> import org.slf4j.LoggerFactory;
>
> public class PerformanceComparator {
>
> static Logger logbacklogger = LoggerFactory
> .getLogger(PerformanceComparator.class);
> static org.apache.log4j.Logger log4jlogger = org.apache.log4j.Logger
> .getLogger(PerformanceComparator.class);
>
> // How many times should we try to log:
> static int loop = 1000000;
>
> public static void main(String[] args) throws InterruptedException {
> initConfig();
>
> // Let's run once for Just In Time compiler
> log4jDirectDebugCall();
> log4jTestedDebugCall();
> logbackDirectDebugCall();
> logbackTestedDebugCall();
> logbackParametrizedDebugCall();
>
> // let's run the tests and display the results:
> long result1 = log4jDirectDebugCall();
> long result2 = log4jTestedDebugCall();
> long result3 = logbackDirectDebugCall();
> long result4 = logbackTestedDebugCall();
> long result5 = logbackParametrizedDebugCall();
>
> System.out.println("###############################################");
> System.out.println("Log4j direct debug call: " + result1);
> System.out.println("Log4j tested (isDebugEnabled) debug call: " +
> result2);
> System.out.println("Logback direct debug call: " + result3);
> System.out
> .println("Logback tested (isDebugEnabled) debug call: " + result4);
> System.out.println("Logback parametrized debug call: " + result5);
> System.out.println("###############################################");
> }
>
> private static long log4jDirectDebugCall() {
> Integer j = new Integer(2);
> long start = System.nanoTime();
> for (int i = 0; i < loop; i++) {
> log4jlogger.debug("SEE IF THIS IS LOGGED " + j + ".");
> }
> return (System.nanoTime() - start) / loop;
> }
>
> private static long log4jTestedDebugCall() {
> Integer j = new Integer(2);
> long start = System.nanoTime();
> for (int i = 0; i < loop; i++) {
> if (log4jlogger.isDebugEnabled()) {
> log4jlogger.debug("SEE IF THIS IS LOGGED " + j + ".");
> }
> }
> return (System.nanoTime() - start) / loop;
> }
>
> private static long logbackDirectDebugCall() {
> Integer j = new Integer(2);
> long start = System.nanoTime();
> for (int i = 0; i < loop; i++) {
> logbacklogger.debug("SEE IF THIS IS LOGGED " + j + ".");
> }
> return (System.nanoTime() - start) / loop;
> }
>
> private static long logbackTestedDebugCall() {
> Integer j = new Integer(2);
> long start = System.nanoTime();
> for (int i = 0; i < loop; i++) {
> if (logbacklogger.isDebugEnabled())
> logbacklogger.debug("SEE IF THIS IS LOGGED " + j + ".");
> }
> return (System.nanoTime() - start) / loop;
> }
>
> private static long logbackParametrizedDebugCall() {
> Integer j = new Integer(2);
> long start = System.nanoTime();
> for (int i = 0; i < loop; i++) {
> logbacklogger.debug("SEE IF THIS IS LOGGED {}.", j);
> }
> return (System.nanoTime() - start) / loop;
> }
>
> private static void initConfig() {
> org.apache.log4j.Logger log4jRoot =
> org.apache.log4j.Logger.getRootLogger();
> log4jRoot.setLevel(org.apache.log4j.Level.INFO);
>
> ch.qos.logback.classic.Logger lbRoot =
> (ch.qos.logback.classic.Logger) LoggerFactory
> .getLogger("ROOT");
> lbRoot.setLevel(ch.qos.logback.classic.Level.INFO);
>
> // create the loggers
> org.apache.log4j.Logger.getLogger("perfTest");
> org.apache.log4j.Logger.getLogger("perfTest.ch");
> org.apache.log4j.Logger.getLogger("perfTest.ch.qos");
> org.apache.log4j.Logger.getLogger("perfTest.ch.qos.logback");
> LoggerFactory.getLogger("perfTest");
> LoggerFactory.getLogger("perfTest.ch");
> LoggerFactory.getLogger("perfTest.ch.qos");
> LoggerFactory.getLogger("perfTest.ch.qos.logback");
> }
> }
>
> --
> Sébastien Pennec
> sebastien at qos.ch
>
> Logback: The reliable, generic, fast and flexible logging framework for
> Java.
> http://logback.qos.ch/
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--
Sébastien Pennec
sebastien at qos.ch
Logback: The reliable, generic, fast and flexible logging framework for Java.
http://logback.qos.ch/
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