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From "Xiao-Feng Li" <xiaofeng...@gmail.com>
Subject Re: [jira] Commented: (HARMONY-5523) [drlvm][gc][lang-management][geronimo] MemoryUsage returns incorrect values
Date Fri, 22 Feb 2008 01:06:48 GMT
There is gc_free_memory() API, which can be used to compute the used memory.

On Fri, Feb 22, 2008 at 12:17 AM, Andrey Yakushev (JIRA)
<jira@apache.org> wrote:
>
>     [ 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.
>
>  --
>  This message is automatically generated by JIRA.
>  -
>  You can reply to this email to add a comment to the issue online.
>
>



-- 
http://xiao-feng.blogspot.com

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