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From "Dave Brosius (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-7353) Java heap being set too large on Windows with 32-bit JVM
Date Tue, 17 Jun 2014 00:59:02 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-7353?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14033271#comment-14033271
] 

Dave Brosius commented on CASSANDRA-7353:
-----------------------------------------

i suppose for oracle's jvm you could look at the "sun.arch.data.model" system property to
handle this case, but it's getting kind of ridiculous. why would you run cassandra on a 32
bit jvm on a 64 bit box?

> Java heap being set too large on Windows with 32-bit JVM
> --------------------------------------------------------
>
>                 Key: CASSANDRA-7353
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7353
>             Project: Cassandra
>          Issue Type: Bug
>         Environment: Windows Server 2008, 8G RAM, 32-bit JVM
>            Reporter: Philip Thompson
>            Assignee: Joshua McKenzie
>            Priority: Minor
>              Labels: Windows
>         Attachments: 7353_v1.txt, 7353_v2.txt
>
>
> On windows, the JVM settings for max heap size and new gen heap size are set based on
the total system memory. When the system has 8G of RAM, the max heap size is set to 2048M.
However, according to http://goo.gl/1ElbLm, the recommended max heap for a 32 bit JVM on Windows
is 1.8G.
> When cassandra is started on Windows under these conditions, the following error is seen:
> Error occurred during initialization of VM
> Could not reserve enough space for object heap
> Error: Could not create the Java Virtual Machine.
> Error: A fatal exception has occurred. Program will exit.
> Switching to a 64-bit JVM on the same machine solves the issue. If a 32-bit JVM is being
used, cassandra should be started up with a smaller heap than would be normally used to prevent
the error.



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