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[mkgmap-dev] computing power mdx/mdr

From Gerd Petermann gpetermann_muenchen at hotmail.com on Tue Feb 24 06:59:41 GMT 2015



Hi,

sorry, answering my own post again.
I think I found a simple improvement, see attached patch.
I've committed it with r3477 in the housenumber2 branch.

Gerd

From: gpetermann_muenchen at hotmail.com
To: mkgmap-dev at lists.mkgmap.org.uk
Date: Mon, 23 Feb 2015 22:53:55 +0100
Subject: Re: [mkgmap-dev] computing power mdx/mdr







Hi Steve,

I think Arndt is right, mkgmap requires much more heap now when computing
the index, also without the new --x-split-name-index option.
This is his error message:
Exception in thread "main" java.lang.OutOfMemoryError: GC overhead limit exceeded
   
        at java.nio.CharBuffer.wrap(Unknown Source)
   
        at java.nio.CharBuffer.wrap(Unknown Source)
   
        at uk.me.parabola.imgfmt.app.srt.Sort.createSortKey(Sort.java:182)
   
        at uk.me.parabola.imgfmt.app.srt.Sort.createSortKey(Sort.java:271)
   
        at uk.me.parabola.imgfmt.app.mdr.Mdr7.preWriteImpl(Mdr7.java:168)
   
        at uk.me.parabola.imgfmt.app.mdr.MdrSection.preWrite(MdrSection.java:129)
   
        at uk.me.parabola.imgfmt.app.mdr.MDRFile.writeSections(MDRFile.java:308)
   

           at uk.me.parabola.imgfmt.app.mdr.MDRFile.write(MDRFile.java:247)
   
        at uk.me.parabola.mkgmap.combiners.MdrBuilder.onFinishForDevice(MdrBuilder.java:355)
   
        at uk.me.parabola.mkgmap.combiners.GmapsuppBuilder.onFinish(GmapsuppBuilder.java:163)
   
        at uk.me.parabola.mkgmap.main.Main.endOptions(Main.java:575)
   
        at uk.me.parabola.mkgmap.CommandArgsReader.readArgs(CommandArgsReader.java:128)
   
        at uk.me.parabola.mkgmap.main.Main.mainStart(Main.java:134)
   
        at uk.me.parabola.mkgmap.main.Main.main(Main.java:105)
  

I see two reasons:
1) The structure MDR7Record is a bit larger
2) A lot more bytes are stored in byte[]  arrays and SrtSortKey instances

For a map for Austria this requires 169MB instead of 128 MB.
I think one reason is that Mdr7.preWriteImpl() is always computing and
saving a partial name, no matter what option is used?

Gerd



Date: Sun, 22 Feb 2015 01:12:25 +0100
From: arndt at speichenkarte.de
To: mkgmap-dev at lists.mkgmap.org.uk
Subject: [mkgmap-dev] computing power mdx/mdr


    
 
 
 
  
   Hello @all
   
  
    
   
  
   my PC is not he best machine. 4GB RAM & Intel CoreDuo 3GHz 64bit Win7.
   
  
    
   
  
   Making maps from Europa is no problem, but at the end of the process, mkgmap failed to build  mdx/mdr.
   
  
    
   
  
   For the website www.speichenkarte.de i need germany and a few kilometers more. Size of the files after "splitter" is 2,8 Gb and 213 img-files.
   
  
    
   
  
   mkgmap 3426 is to be able to build this.
   
  
    
   
  
   mkgmap 3472 failed to build  mdx/mdr. Also the gmapsupp dosn´t work/no shown.
   
  
    
   
  
   Need 3472 needs more computing power than 3426?
   
  
    
   
  
   Is it possible change mkgmap, to create mdr/mdx and gmapsupp wiss less cumputer power?
   
  
    
   
  
   Best regards
   
  
   Arndt
   
  
    
   
  
   P.S.
   
  
   Sorry for the bad english, hope you understand what i mean :)
   
  
    
   
  
    
   
  
    
  
 

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