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From "Sergey Kozlov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (IGNITE-6182) Change default max memory size from 80% to 20%
Date Mon, 04 Sep 2017 14:08:00 GMT

    [ https://issues.apache.org/jira/browse/IGNITE-6182?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16152644#comment-16152644
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Sergey Kozlov commented on IGNITE-6182:
---------------------------------------

Guys

I just have checked it and found that the warning is not clear yet. I started 3 nodes and
thrid node prined out:
{noformat}
16:51:21] Attempting to start more nodes than physical RAM available on the host what can
lead to significant slowdown
please decrease JVM heap size, memory policy size or checkpoint buffer size) [required=13002MB,
available=16260MB]
{noformat}

Why the required size is less than the available size but node is still warning?


> Change default max memory size from 80% to 20%
> ----------------------------------------------
>
>                 Key: IGNITE-6182
>                 URL: https://issues.apache.org/jira/browse/IGNITE-6182
>             Project: Ignite
>          Issue Type: Task
>          Components: general
>    Affects Versions: 2.1
>            Reporter: Vladimir Ozerov
>            Assignee: Igor Seliverstov
>            Priority: Blocker
>             Fix For: 2.2
>
>
> Currently we can allocate up to 80% of available RAM by default. It could lead to swap
with potential risk of hang.
> In order to improve user experience, we need to do the following:
> 1) Decrease default to 20% ({{MemoryConfiguration.DFLT_MEMORY_POLICY_FRACTION}})
> 2) When node starts it should sum max sizes of all memory regions plus Java's XMX. If
result is greater than 50% of total RAM, we should issue a warning about potential swap.



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