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From Dmitry Pavlov <dpavlov....@gmail.com>
Subject Re: [IGNITE-5717] improvements of MemoryPolicy default size
Date Tue, 01 Aug 2017 10:10:39 GMT
+1 to Sergey,
I think OOME may confuse user and and may spoil the user's impression at
first check of Apache Ignite.

вт, 1 авг. 2017 г. в 12:36, Vladimir Ozerov <vozerov@gridgain.com>:

> +1
>
> 80% of RAM is way too aggressive. With this value virtually every user will
> have problems with OOME or excessive swapping during development. I would
> set maxMemory to some relatively small value, may be even less that 1Gb to
> let Ignite run smoothly on developer's laptops, and print a performance
> suggestion to increase it in production.
>
> On Tue, Aug 1, 2017 at 12:19 PM, Sergey Chugunov <
> sergey.chugunov@gmail.com>
> wrote:
>
> > Folks,
> >
> > I would like to get back to the question about MemoryPolicy maxMemory
> > defaults.
> >
> > Although MemoryPolicy may be configured with initial and maxMemory
> > settings, when persistence is used MemoryPolicy always allocates
> maxMemory
> > size for performance reasons.
> >
> > As default size of maxMemory is 80% of physical memory it causes OOME
> > exceptions of 32 bit platforms (either on OS or JVM level) and hurts
> > performance in setups when multiple Ignite nodes are started on the same
> > physical server.
> >
> > I suggest to rethink these defaults and switch to other options:
> >
> >    - Check whether platform is 32 or 64 bits and adapt defaults. In this
> >    case we still need to address the issue with multiple nodes on one
> > machine
> >    even on 64 bit systems.
> >
> >    - Lower defaults for maxMemory and allocate, for instance, max(0.3 *
> >    availableMemory, 1Gb).
> >    This option allows us to solve all issues with starting on 32 bit
> >    platforms and reduce instability with multiple nodes on the same
> > machine.
> >
> >
> > Thoughts and/or other options?
> >
> > Thanks,
> > Sergey.
> >
>

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