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From "Andrey Yakushev (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HARMONY-5523) [drlvm][gc][lang-management][geronimo] MemoryUsage returns incorrect values
Date Thu, 21 Feb 2008 16:17:22 GMT

    [ https://issues.apache.org/jira/browse/HARMONY-5523?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12571092#action_12571092
] 

Andrey Yakushev commented on HARMONY-5523:
------------------------------------------

I'd implemented:

  jlong used = gc_total_memory(); 
  jlong committed = gc_total_memory(); 

because vm<->gc interface didn't have the request for committed memory, and I didn't
imagine the situation when returning "used" instead of "committed" could confuse any requster.

Nevertheless for pure imlementation we can add precise committed value.

Could we extend vm<->gc interface for such request and implement it in gc_gen?


> [drlvm][gc][lang-management][geronimo] MemoryUsage returns incorrect values
> ---------------------------------------------------------------------------
>
>                 Key: HARMONY-5523
>                 URL: https://issues.apache.org/jira/browse/HARMONY-5523
>             Project: Harmony
>          Issue Type: Bug
>          Components: App-Oriented Bug Reports, DRLVM
>    Affects Versions: 5.0M4, 5.0M5
>            Reporter: Vasily Zakharov
>         Attachments: Harmony-5523-classlib.patch
>
>
> The following test demonstrates the problem:
> public class Test {
>     public static void main(String[] args) throws Exception {
>         System.out.println(java.lang.management.ManagementFactory.getMemoryMXBean().getHeapMemoryUsage());
>     }
> }
> Output on RI:
> $ java Test
> init = 0(0K) used = 162416(158K) committed = 2031616(1984K) max = 66650112(65088K)
> $ java -Xms128M -Xmx256M Test
> init = 134217728(131072K) used = 166480(162K) committed = 133234688(130112K) max = 266403840(260160K)
> Output on Harmony:
> $ java Test
> MemoryUsage: init=16777216used=16777216committed=16777216max=16777216
> $ java -Xms128M -Xmx256M Test
> MemoryUsage: init=134217728used=134217728committed=134217728max=134217728
> Clearly enough, the following problems do exist:
> 1. getUsed() method always returns the -Xms value instead of actual used memory amount.
> 2. getMax() method returns the -Xms value instead of -Xmx value.
> 3. toString() method works incorrectly (output is badly readable).
> This issues causes the Geronimo console to display the used memory information incorrectly.

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