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From "Robert Stupp (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-7353) Java heap being set too large on Windows with 32-bit JVM
Date Mon, 16 Jun 2014 15:04:02 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-7353?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14032512#comment-14032512
] 

Robert Stupp commented on CASSANDRA-7353:
-----------------------------------------

Just a note: as far as I can remember there are differences in multiple installations of 32bit-Win
regarding the max possible heap size.
One machine could work with 1500m - another (same hardware) couldn't.
I think the most common max heap setting for 32bit-Win was about 1300m.

> 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
>
>
> 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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