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 <[EMAIL PROTECTED]>
To: logback users list <[email protected]>
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
[EMAIL PROTECTED]
Logback: The reliable, generic, fast and flexible logging framework for Java.
http://logback.qos.ch/
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