LISTSERV mailing list manager LISTSERV 16.0

Help for ECJ-INTEREST-L Archives


ECJ-INTEREST-L Archives

ECJ-INTEREST-L Archives


ECJ-INTEREST-L@LISTSERV.GMU.EDU


View:

Message:

[

First

|

Previous

|

Next

|

Last

]

By Topic:

[

First

|

Previous

|

Next

|

Last

]

By Author:

[

First

|

Previous

|

Next

|

Last

]

Font:

Proportional Font

LISTSERV Archives

LISTSERV Archives

ECJ-INTEREST-L Home

ECJ-INTEREST-L Home

ECJ-INTEREST-L  August 2007

ECJ-INTEREST-L August 2007

Subject:

Re: Problem with restoring a checkpoint...

From:

"Magrath, Shane" <[log in to unmask]>

Reply-To:

ECJ Evolutionary Computation Toolkit <[log in to unmask]>

Date:

Wed, 22 Aug 2007 12:12:43 +0930

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (97 lines)

Thanks Sean,
This certainly fixed it.

In a rush of irrational optimism, I also added a JFileChooser dialog to
allow me to avoid the ugliness of the hard coded solution. Of course, as
soon as did this the Log was no longer backwards compatible with the
serialised version in the checkpoint file! 

Mea Culpa.

Shane Magrath

-----Original Message-----
From: ECJ Evolutionary Computation Toolkit
[mailto:[log in to unmask]] On Behalf Of Sean Luke
Sent: Monday, 20 August 2007 12:11 PM
To: [log in to unmask]
Subject: Re: Problem with restoring a checkpoint...

On Aug 19, 2007, at 8:49 PM, Magrath, Shane wrote:

> I'm having a problem loading a checkpoint file that was produced on a 
> different system (Vista in this case).
> The issue is caused because the log file is required to be located in 
> **exactly** the same position in the directory tree, which under Vista

> is different to XP.
> Viz,
> XP:    C:\Documents and Settings\Shane\My Documents\Java\ECJ\dist 
> \pop.stat
> Vista: C:\Users\Shane\Documents\dist\pop.stat
>
> I imagine thsi problem would also exist when sharing checkpoints 
> across other OSs as well, eg MAC and Linux...
>
> Error Message:
> STARTUP ERROR:
> An IO Exception was generated uponstarting up, probably in setting up 
> a log Here it is:
> java.io.FileNotFoundException: C:\Users\Shane\Documents\dist \pop.stat

> (The system cannot find the path specified)

Interesting problem.  So a quick explanation of how the Output facility
works.  Output basically maintains a collection of Logs.  A Log is an
abstract wrapper around, typically, a PrintWriter.  Logs don't receive
streams of data -- they receive String messages via the print, fatal,
warning, or error functions in Output.  Logs can restart themselves
after recovery from checkpoint, and they can keep everything in memory
so as to spit out messages to the files when recovering from checkpoint.
This funkiness harkens back to 1998, when Java 1.1 had terrible logging
facilities.  It's an obvious place to do cleanup in ECJ nowadays, but it
works and is stable and so I tend to leave it be.

When ECJ recovers from checkpoint, it rebuilds its Logs and then it
calls restart() on each of them.  The default operation of the restart
() method is for the Log to all restart(this) on its LogRestarter, an
abstract object whose job is to start the Log up again.  Different
restarters know how to start up different kinds of logs (writing to
Stdout, being gzipped, etc.).  See the ec/util/Log.java file for how
this is done.

In your case, you're writing to pop.stat file, which is a non-gzipped
ordinary file.  The LogRestarter is created by the Log on line 142 of
Log.java for this kind of file.  Notice that the restart(Log) method in
the LogRestarter does this:

	l.writer = new PrintWriter(new BufferedWriter(
		new
FileWriter(l.filename.getPath(),l.appendOnRestart)));

What's getting locked into that LogRestarter is l.filename, which is
what you want to change.  So here's what I recommend doing.  Go into
Log.java and modify restart() to detect which Log is throwing an
exception and hard-code the file from there, something crazy like this:


     public Log restart() throws IOException
         {
	try { return restarter.restart(this); }
	catch (FileNotFoundException e)
		{
		writer = new PrintWriter(new BufferedWriter(
			new FileWriter(new File(
	
"C:\Users\Shane\whateverTheNewPathIs\pop.stat").getPath(),
				appendOnRestart)));
		return this;
		}
         }

Something like that.  You get the idea.  You're hard-coding setting up
the log on restart.  This should do the trick (crosses fingers).

Sean

IMPORTANT: This email remains the property of the Australian Defence Organisation and is subject to the jurisdiction of section 70 of the CRIMES ACT 1914.  If you have received this email in error, you are requested to contact the sender and delete the email.

Top of Message | Previous Page | Permalink

Advanced Options


Options

Log In

Log In

Get Password

Get Password


Search Archives

Search Archives


Subscribe or Unsubscribe

Subscribe or Unsubscribe


Archives

September 2019
August 2019
June 2019
April 2019
March 2019
January 2019
December 2018
November 2018
October 2018
July 2018
May 2018
January 2018
December 2017
November 2017
October 2017
September 2017
August 2017
July 2017
June 2017
May 2017
April 2017
March 2017
February 2017
January 2017
December 2016
November 2016
October 2016
September 2016
August 2016
July 2016
June 2016
May 2016
April 2016
March 2016
February 2016
January 2016
December 2015
November 2015
October 2015
September 2015
August 2015
July 2015
June 2015
May 2015
April 2015
March 2015
February 2015
January 2015
December 2014
November 2014
September 2014
August 2014
July 2014
June 2014
May 2014
April 2014
March 2014
February 2014
January 2014
December 2013
November 2013
October 2013
September 2013
August 2013
July 2013
June 2013
May 2013
April 2013
March 2013
February 2013
January 2013
December 2012
November 2012
October 2012
September 2012
July 2012
June 2012
May 2012
April 2012
March 2012
February 2012
January 2012
December 2011
November 2011
October 2011
September 2011
August 2011
July 2011
June 2011
May 2011
April 2011
March 2011
February 2011
January 2011
December 2010
November 2010
October 2010
September 2010
August 2010
July 2010
June 2010
May 2010
April 2010
March 2010
February 2010
January 2010
December 2009
November 2009
October 2009
September 2009
August 2009
July 2009
June 2009
May 2009
April 2009
March 2009
February 2009
January 2009
December 2008
November 2008
October 2008
September 2008
August 2008
July 2008
June 2008
May 2008
April 2008
March 2008
February 2008
January 2008
December 2007
November 2007
October 2007
September 2007
August 2007
July 2007
June 2007
May 2007
April 2007
March 2007
February 2007
January 2007
December 2006
November 2006
October 2006
September 2006
August 2006
July 2006
June 2006
May 2006
April 2006
March 2006
February 2006
January 2006
December 2005
November 2005
October 2005
September 2005
August 2005
July 2005
June 2005
May 2005
April 2005
March 2005
February 2005
January 2005
December 2004
November 2004
September 2004
August 2004
July 2004
June 2004
May 2004
April 2004
March 2004

ATOM RSS1 RSS2



LISTSERV.GMU.EDU

CataList Email List Search Powered by the LISTSERV Email List Manager