[jira] Updated: (HARMONY-3148) [Classlib][nio] alloc many DirectByteBuffers may cause memory-out-error

["Leo Li (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HARMONY-3148?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Leo Li updated HARMONY-3148:
----------------------------

    Attachment: patch-3148.zip

Hi, all:
      In the patch, before new memory is allocated to dirrect byte buffer, current system memory status will be queried. And if necessary, a System.gc will be invoked.
     And it can prevent the out-of-memory error occured in this jira.
     But the real number of threshold is debatable. After some experiments, I found that the necessary free memory required to remain is dependent on the VM and OS we uses.
     Will somebody try the patch?


Thanks,
Leo.



> [Classlib][nio] alloc many DirectByteBuffers may cause memory-out-error
> -----------------------------------------------------------------------
>
>                 Key: HARMONY-3148
>                 URL: https://issues.apache.org/jira/browse/HARMONY-3148
>             Project: Harmony
>          Issue Type: Bug
>          Components: Classlib
>            Reporter: Jimmy, Jing Lv
>         Assigned To: Tim Ellison
>         Attachments: patch-3148.zip
>
>
> Hi,
>      As discussed on mailing-list, DirectByteBuffer uses native memory which is out of GC-control, alloc many DirectByteBuffer may cause memory-out-error if they are not GCed, even they can be GCed at that time. 
>      This happens in Harmony but not in RI. This should be a bug of Harmony.
>      Note: other native memory users, e.g., java.util.zip.Deflater, may cause this problem as well.

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