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Bug 207728 - Opening of heap dump on linux is very slow
Summary: Opening of heap dump on linux is very slow
Status: RESOLVED FIXED
Alias: None
Product: profiler
Classification: Unclassified
Component: Engine (show other bugs)
Version: 6.x
Hardware: PC Linux
: P2 normal (vote)
Assignee: Tomas Hurka
URL:
Keywords: PERFORMANCE, VISUALVM
Depends on:
Blocks: 181194
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Reported: 2012-01-25 14:14 UTC by Petr Cyhelsky
Modified: 2012-09-27 15:21 UTC (History)
0 users

See Also:
Issue Type: DEFECT
Exception Reporter:

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Description Petr Cyhelsky 2012-01-25 14:14:16 UTC 

    


    


      



        
          Comment 1
        

        
          Tomas Hurka

        

        
        

        
          2012-01-25 14:35:35 UTC
        

      






This problem is specially visible in a larger heap dumps >600M., where opening heap dump is significantly slower for second half (opening progress is bigger than 50%). The computation of the references is also significantly slower (compared to other Operating systems).

    


    


      



        
          Comment 2
        

        
          Tomas Hurka

        

        
        

        
          2012-02-01 13:03:30 UTC
        

      






Fixed in profiler-main
changeset:   211795:3cc3143ce40c
user:        Tomas Hurka <thurka@netbeans.org>
date:        Wed Feb 01 13:46:49 2012 +0100
summary:     bugfix #207728, use FileChannel.MapMode.PRIVATE on Linux

the fix was tested with ~ 1G heap dump and the loading heap dump is now down to 37 seconds from 10 minutes and computation of references is down to 80 sec. from 11 minutes.