[logback-dev] [JIRA] Commented: (LBCORE-63) Deadlock when running on multiple core processors

[Ceki Gulcu (JIRA)]

    [ http://jira.qos.ch/browse/LBCORE-63?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=10901#action_10901 ] 

Ceki Gulcu commented on LBCORE-63:
----------------------------------

Pawel, 

Ralph's made has made it into the trunk and was part of the 0.9.11 release. The bad news is that the problem that you are suffering from is in the eclipse plug-in. Ralph's patch merely displaces the deadlock elsewhere.  

> Deadlock when running on multiple core processors
> -------------------------------------------------
>
>                 Key: LBCORE-63
>                 URL: http://jira.qos.ch/browse/LBCORE-63
>             Project: logback-core
>          Issue Type: Sub-task
>    Affects Versions: 0.9.9
>         Environment: Operating System: Windows
> Platform: PC
>            Reporter: Toni Heimala
>            Assignee: Ceki Gulcu
>            Priority: Blocker
>         Attachments: patch.txt, patch2.txt, patch3.txt
>
>
> When you run logging into same file from many threads on a system that has more than one physical processor (Dual Core for example), a deadlock will occur after a while. This can not be reproduced on HyperThreading processors. Here's an example program that will demonstrate the behavior:
> -----------------------------
> Main.java
> -----------------------------
> import java.util.Date;
> import java.util.concurrent.ScheduledThreadPoolExecutor;
> import java.util.concurrent.TimeUnit;
> import org.slf4j.Logger;
> import org.slf4j.LoggerFactory;
> import ch.qos.logback.classic.LoggerContext;
> import ch.qos.logback.classic.joran.JoranConfigurator;
> import ch.qos.logback.core.joran.spi.JoranException;
> public class Main extends Thread
> {
>     private final static String LOGGER_CONFIGURATION_FILE = "logger.xml";
>     private final Logger logger = LoggerFactory.getLogger(Main.class);
>     
>     private final long start;
>     
>     public Main()
>         throws JoranException
>     {
>         start = new Date().getTime();
>         LoggerContext lc = (LoggerContext)LoggerFactory.getILoggerFactory();
>         JoranConfigurator configurator = new JoranConfigurator();
>         lc.shutdownAndReset();
>         configurator.setContext(lc);
>         configurator.doConfigure(LOGGER_CONFIGURATION_FILE);
>     }
>     
>     public void start()
>     {
>         ScheduledThreadPoolExecutor ex1 = new ScheduledThreadPoolExecutor(1);
>         ScheduledThreadPoolExecutor ex2 = new ScheduledThreadPoolExecutor(1);
>         ScheduledThreadPoolExecutor ex3 = new ScheduledThreadPoolExecutor(1);
>         ScheduledThreadPoolExecutor ex4 = new ScheduledThreadPoolExecutor(1);
>         ScheduledThreadPoolExecutor ex5 = new ScheduledThreadPoolExecutor(1);
>         ex1.scheduleAtFixedRate(new Task("EX1"), 10, 10, TimeUnit.MICROSECONDS);
>         ex2.scheduleAtFixedRate(new Task("EX2"), 10, 10, TimeUnit.MICROSECONDS);
>         ex3.scheduleAtFixedRate(new Task("EX3"), 10, 10, TimeUnit.MICROSECONDS);
>         ex4.scheduleAtFixedRate(new Task("EX4"), 10, 10, TimeUnit.MICROSECONDS);
>         ex5.scheduleAtFixedRate(new Task("EX5"), 10, 10, TimeUnit.MICROSECONDS);
>         
>         super.start();
>     }
>     
>     public void run()
>     {
>         try
>         {
>             while(true)
>             {
>                 logger.debug("[MAIN] {}", new Date().getTime() - start);
>                 Thread.sleep(10);
>             }
>         }
>         catch (InterruptedException e)
>         {
>             logger.info("[MAIN]: Interrupted: {}", e.getMessage());
>         }
>     }
>     
>     public static void main(String[] args)
>     {
>         try
>         {
>             Main main = new Main();
>             main.start();
>         }
>         catch (JoranException e)
>         {
>             System.out.println("Failed to load application: " + e.getMessage());
>         }
>     }
> }
> -------------------------------
> Task.java
> -------------------------------
> import java.util.Date;
> import org.slf4j.Logger;
> import org.slf4j.LoggerFactory;
> public class Task implements Runnable
> {
>     private final Logger logger = LoggerFactory.getLogger(Task.class);
>     private final Logger logger_main = LoggerFactory.getLogger(Main.class);
>     private final String name;
>     private final long start;
>     
>     public Task(final String name)
>     {
>         this.name = name;
>         start = new Date().getTime();
>     }
>     public void run()
>     {
>         logger.debug("[{}] {}", name, new Date().getTime() - start);
>         logger_main.debug("[MAIN] - [{}] {}", name, new Date().getTime() - start);
>     }
> }

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