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From "Joshua McKenzie (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-7316) Windows feature parity - lock JVM in memory to prevent swapping
Date Fri, 08 Aug 2014 16:43:12 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-7316?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14090953#comment-14090953
] 

Joshua McKenzie commented on CASSANDRA-7316:
--------------------------------------------

Your summary gels with both mine and Ala's findings - I'm +1 on closing as won't fix.  Given
that windows users have another way to resolve this that's vastly lower complexity and the
current windows ecosystem doesn't seem to value locking pages in RAM in general, I think we
should leave that ball in their court to configure as they see fit.

We could reduce friction on that choice and modify either the install scripts in PowerShell
or the start-up scripts (or both) w/an optional flag to use Get-WmiObject on [Win32_PageFileSetting
|http://msdn.microsoft.com/en-us/library/aa394245(v=vs.85).aspx] and disable the page file
for the user if requested (similar to what we do with tcp keepalive via install script). 
Another slightly less invasive option would be to warn if we query and see the page file enabled,
suggesting to users that they should disable paging on their machines in production.

I kind of like the idea of doing both but I'll need to think on it a bit more before I'm really
sold on it.

> Windows feature parity - lock JVM in memory to prevent swapping
> ---------------------------------------------------------------
>
>                 Key: CASSANDRA-7316
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7316
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Joshua McKenzie
>            Assignee: Joshua McKenzie
>            Priority: Minor
>              Labels: Windows, perfomance
>             Fix For: 3.0
>
>
> Similar to mlockall() in CLibrary.java for linux, it would be nice to lock the virtual
address space on Windows to prevent page faults.
> One option: Reference API:  http://msdn.microsoft.com/en-us/library/windows/desktop/aa366895(v=vs.85).aspx



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