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  1. JDK
  2. JDK-5092131

using 1 MB pagesize throws "not enough space" error with 32bit JVM

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Details

    • Bug
    • Resolution: Duplicate
    • P3
    • None
    • 1.4.2_05
    • core-libs
    • generic
    • generic

    Description

      We have a problem when we are accessing a huge file (~6GB) using NIO and
      MappedByteBuffers. Since file is huge, I tried to map only portions of
      the file - no more than 16 portions 1MB each. And eventually I got an
      IO exception "Can not allocate memory". I was not able to find any leaks
      or other problems in my program. It works fine with relatively small
      files. Then I searched news groups and found posting about similar
      issue. So, I ran a simple test program on the same file and reproduced
      the problem - once I set the portion size to 1MB, I am getting an exception.

      Below is an output from successfull run (when portion is 100KB) and failing run (with 1MB). You can also see the version of JVM I am running. I am able to reproduce this on Linux and on Windows 2000.

      polly:/tmp 3> java -version
      java version "1.4.2_03"
      Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_03-b02)
      Java HotSpot(TM) Client VM (build 1.4.2_03-b02, mixed mode)
      polly:/tmp 4> java -cp . Test $RDB/adt040803.dat 10000 100000
      Mapping /usr/local/instinet/RTS/var/db/2004_08_03/adt040803.dat
        size of file: 6337593344
        size of page: 100000
        iterations : 10000
      polly:/tmp 5> java -cp . Test $RDB/adt040803.dat 10000 1000000 | less 2>&1
      Mapping /usr/local/instinet/RTS/var/db/2004_08_03/adt040803.dat
        size of file: 6337593344
        size of page: 1000000
        iterations : 10000
      Exception occurred at count 1927 trying to map from 3557000000 to 3558000000
      (1927 faults so far)
      Exception in thread "main" java.io.IOException: Cannot allocate memory
              at sun.nio.ch.FileChannelImpl.map0(Native Method)
              at sun.nio.ch.FileChannelImpl.map(FileChannelImpl.java:705)
              at Test.main(Test.java:53)
      polly:/tmp 6>

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              alanb Alan Bateman
              gnagasunsunw Gopinath Nagasundara (Inactive)
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