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From Vladislav Pyatkov <vldpyat...@gmail.com>
Subject Re: Combined off heap size?
Date Wed, 17 Aug 2016 16:21:48 GMT
Hello,

About offHeapMaxMemory you need to know next:
1) The size is limit off heap size on one node of cache.
2) Ignite do not allocate fully off heap size immediatly. Allocation will
occure by required.

If you want to allocate N GB for off heap, you can to set offHeapMaxMemory
to N for each from caches, but you risk to get "out of memory" in unsave
code.

While there is no way to establish a common limitation to all caches.

On Wed, Aug 17, 2016 at 6:44 PM, yucigou <yuci.gou@gmail.com> wrote:

> According to page http://apacheignite.gridgain.org/docs/off-heap-memory, I
> can set the off heap size using the offHeapMaxMemory.
>
> If I understand correctly, this is for a single cache. Considering the
> following configuration, I've got three caches, namely session-cache,
> data-cache and penalty-cache. And the off heap size for each cache is set
> to
> 10GB. That is, I need 30GB RAM to accommodate the off heap memory for all
> the three caches.
>
>         <bean id="ignite.cfg"
> class="org.apache.ignite.configuration.IgniteConfiguration">
>                 <property name="cacheConfiguration">
>                         <list>
>                                 <bean class="org.apache.ignite.
> configuration.CacheConfiguration">
>                                         <property name="name"
> value="session-cache" />
>                                         <property name="cacheMode"
> value="PARTITIONED"/>
>                                         <property name="backups"
> value="1"/>
>                                         <property name="memoryMode"
> value="OFFHEAP_VALUES"/>
>                                         <property name="offHeapMaxMemory"
> value="#{10 * 1024L * 1024L *
> 1024L}"/>
>                                 </bean>
>                                 <bean class="org.apache.ignite.
> configuration.CacheConfiguration">
>                                         <property name="name"
> value="data-cache" />
>                                         <property name="cacheMode"
> value="PARTITIONED"/>
>                                         <property name="backups"
> value="1"/>
>                                         <property name="memoryMode"
> value="OFFHEAP_VALUES"/>
>                                         <property name="offHeapMaxMemory"
> value="#{10 * 1024L * 1024L *
> 1024L}"/>
>                                 </bean>
>                                 <bean class="org.apache.ignite.
> configuration.CacheConfiguration">
>                                         <property name="name"
> value="penalty-cache" />
>                                         <property name="cacheMode"
> value="PARTITIONED"/>
>                                         <property name="backups"
> value="1"/>
>                                         <property name="memoryMode"
> value="OFFHEAP_VALUES"/>
>                                         <property name="offHeapMaxMemory"
> value="#{10 * 1024L * 1024L *
> 1024L}"/>
>                                 </bean>
>                         </list>
>                 </property>
>         </bean>
>
> It is likely that as time goes by, 10G is not enough for one cache (e.g.,
> data-cache), but still more than enough for another (e.g., penalty-cache).
> That is, the off heap memory is not used efficiently.
>
> My question is, is there a way to set the combined off heap size? For
> example, I want to set the combined off heap size to 30G for all three
> caches, regardless of which cache uses what amount of it.
>
> Is it possible? Thanks.
>
>
>
> --
> View this message in context: http://apache-ignite-users.
> 70518.x6.nabble.com/Combined-off-heap-size-tp7137.html
> Sent from the Apache Ignite Users mailing list archive at Nabble.com.
>



-- 
Vladislav Pyatkov

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