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From Ceki Gülcü <c...@qos.ch>
Subject Re: Performance between Log4j and custom in-house logger
Date Tue, 03 Sep 2002 15:05:39 GMT

What is the difference between Strings, taking the values 2,4 and 8,
and Request, taking the values 100, 1000 and 2000?

Are you sure you are waiting for the background thread to finish?

Your log4j configuration file suggests that your tests use two
appenders dest1 and dest2. You are aware that appenders are additive,
right?  Does logging output go both c:/skk/cps/logger/test/test1.log
and c:/skk/cps/logger/test/test.log? Given that writing to a file is
the most time consuming task, is it fait to say that log4j is doing
twice the work roughly at the same cost?

At 07:29 03.09.2002 -0700, you wrote:
>Hi,
>
>We are planning to move from a custom in house logging
>framework (MyLogger) to using Log4j and have been
>doing some performance comparison between log4j and
>MyLogger.
>
>The numbers seem to be favoring mylogger over log4j.
>
>
>Sample Numbers
>==============
>Note: Timing includes logj startup time, mylogger
>startup time and junitperf startup time.
>
>1) Logging 2 strings, each of size: 128bytes
>
>Request MyLogger(sec) Log4j(sec)
>======  =======       =========
>100     1.22    1.29
>1000    1.67    1.71
>2000    2.12    2.01
>
>
>
>2) Logging 4 strings, each of size: 128bytes
>
>Request MyLogger(sec) Log4j(sec)
>======  =======       =========
>100     1.21    1.25
>1000    1.653   1.82
>2000    2.24    2.56
>
>
>3) Logging 8 strings, each of size: 128bytes
>
>Request MyLogger(sec) Log4j(sec)
>======  =======       =========
>100     1.35    1.35
>400     1.56    1.71
>900     1.8     2.35
>
>4) Logging 80 strings, each of size: 128bytes
>
>Request MyLogger(sec) Log4j(sec)
>======  =======       =========
>100     1.251   1.7
>1000    1.81    6.1
>2000    2.15    11.2
>
>
>Sample code and configuration
>===========================
>log4j.properties
>==============
>log4j.rootCategory=DEBUG,dest1
>
>log4j.appender.dest1=org.apache.log4j.RollingFileAppender
>log4j.appender.dest1.layout=org.apache.log4j.SimpleLayout
>log4j.appender.dest1.File=c:/skk/cps/logger/test/test1.log
>log4j.appender.dest1.MaxFileSize=4MB
>log4j.appender.dest1.MaxBackupIndex=60
>
>
>log4j.category.ut.log.Log4jPerfTest=DEBUG,dest2
>log4j.additivity.Log4jPerfTest=false
>log4j.appender.dest2=org.apache.log4j.RollingFileAppender
>log4j.appender.dest1.layout=org.apache.log4j.TTCCLayout
>
>log4j.appender.dest2.File=c:/skk/cps/logger/test/test.log
>log4j.appender.dest2.MaxFileSize=4MB
>log4j.appender.dest2.MaxBackupIndex=60
>
>Test Logger code
>===============
>
>Note: logMsgs is an array with strings of size 128
>bytes.
>
>    public void test_Log4j() throws Exception {
>
>         int size = logMsgs.size();
>
>         for( int i=0; i<size; i++ ) {
>             log4jLogger.info( (String)logMsgs.get(i)
>);
>         }
>
>     }
>
>Some of my questions
>
>1) Is there anything that I can do to increase the
>performance of log4j on my box( Pentium-3, 800Mhz,
>512MB RAM)
>
>2) I see some architectural difference between the way
>mylogger and log4j is implemented namely
>  My logger does formatting&writing to log file in a
>background thread whereas it seems that log4j doesn't
>  seem do the same. Is this true.
>  My logger uses the concept of observer and
>observable.
>
>
>Thanks.
>
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--
Ceki

TCP implementations will follow a general principle of robustness: be
conservative in what you do, be liberal in what you accept from
others. -- Jon Postel, RFC 793



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