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Posted to issues@ignite.apache.org by "Dmitriy Pavlov (JIRA)" <ji...@apache.org> on 2018/07/27 17:04:00 UTC
[jira] [Commented] (IGNITE-9112) Pre-touch for Ignite off-heap
memory
[ https://issues.apache.org/jira/browse/IGNITE-9112?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16560004#comment-16560004 ]
Dmitriy Pavlov commented on IGNITE-9112:
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Hi [~agerus], proposal seems reasonable to me.
In the same time I would encourage you to discuss this issue on dev.list: dev@ignite.apache.org so everybody in community could provide feedback.
> Pre-touch for Ignite off-heap memory
> ------------------------------------
>
> Key: IGNITE-9112
> URL: https://issues.apache.org/jira/browse/IGNITE-9112
> Project: Ignite
> Issue Type: New Feature
> Affects Versions: 2.4, 2.5, 2.6
> Reporter: Alexander Gerus
> Priority: Major
> Labels: features, offheap
>
> At the moment Ignite off-heap memory is allocated in virtual memory of operating system, not physical memory: it is recorded in an internal data structure to avoid it being used by any other process. Not even a single page will be allocated in physical memory until it's actually accessed. When the Ignite needs memory, the operating system will allocate pages as needed.
> The proposal is to add an option to Ignite that will touch every single byte of the max off heap with a '0', resulting in the memory being allocated in the physical memory in addition to being reserved in the internal data structure (virtual memory). Similar option is available in JVM {{-XX:+AlwaysPreTouch}}
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