[logback-user] logback console appender slow on windows xp

[Peter Kullmann]

Hi Ceki

I have tried using System.out.println() instead of logger.debug(). It is fast (less than a second).

Best regards,
Peter

Am 20.12.2011 um 18:50 schrieb ceki:

> Hi Peter,
> 
> If I understand correctly, you have shown that invoking System.out.println is slow with javaw. Do you know why?
> If the reason was known, for example it was due to exceptions being thrown, ConsoleAppender could address that problem.
> 
> Is it possible to check whether an app is running under javaw and not java? ConsoleAppender could disable itself under javaw.
> 
> -- 
> Ceki
> http://twitter.com/#!/ceki
> 
> On 20.12.2011 18:34, Peter Kullmann wrote:
>> Hi,
>> 
>> we had a problem with the performance of our application and it boiled down to very bad performance of the console appender when there is no console (in particular on windows xp).
>> 
>> You can see the whole context of the issue here: http://www.eclipse.org/forums/index.php/m/768740/#msg_768740
>> 
>> Here's the conclusion and the code for my experiments:
>> 
>> 
>> package testlogback;
>> 
>> import java.io.FileWriter;
>> import java.io.IOException;
>> 
>> import org.slf4j.Logger;
>> import org.slf4j.LoggerFactory;
>> 
>> public class Main {
>>     public static void main(String[] args) throws IOException {
>>         Logger logger = LoggerFactory
>>                 .getLogger("chapters.introduction.HelloWorld1");
>>         long start = System.currentTimeMillis();
>>         for (int i = 0; i<  10000; i++) {
>>             logger.debug("Hello world.");
>>         }
>>         long end = System.currentTimeMillis();
>> 
>>         FileWriter fileWriter = new FileWriter("logbacktest.out");
>>         fileWriter.write("Time: " + (end - start) + "\n");
>>         fileWriter.close();
>>         System.out.println("Time: " + (end - start));
>>     }
>> }
>> 
>> 
>> On my windows box it prints out "Time: 140" when started as "java -jar testlogback.jar". If I start "javaw -jar testlogback.jar" it uses 100% CPU for about 20 seconds (for effectively doing nothing). This is the case for Sun ire 6 and 7 on windows xp.
>> 
>> On windows 7 the situation is better: javaw uses only about 7 seconds (which is still too much, I guess).
>> 
>> Best regards,
>> Peter
>> 
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