Using Ignite 2.15, i am trying to do some cache sizing. Do we have any documents to do sizing activity?

I found an old document https://apacheignite.readme.io/docs/capacity-planning

Is this still relevant, in the newer documentation i don t see the references to the above document.

Also even in this document, what is the an overhead of one cache minus the data. I was doing some basic tests where i used the example dataregion configuration file and simply added caches with no data and recorded some memory numbers off my mac.

Below are the number s i see,

So roughly i see ~ 15-20MB per cache. Is this understanding accurate? Any way to reduce this internal memory footprint?

Below are the dataregion and cache configs. Pretty straight forward off the examples configs,

<property name="dataStorageConfiguration">
        <bean class="org.apache.ignite.configuration.DataStorageConfiguration">
            <!--
                Default memory region that grows endlessly. A cache is bound to this memory region
                unless it sets another one in its CacheConfiguration.
            -->
            <property name="defaultDataRegionConfiguration">
                <bean class="org.apache.ignite.configuration.DataRegionConfiguration">
                    <property name="name" value="Default_Non_Persistent_Region"/>
                    <!-- 15 MB initial memory region with disabled eviction -->
                    <property name="initialSize" value="#{15 * 1024 * 1024}"/>
                     <!-- 400 MB max memory region -->
                    <property name="maxSize" value="#{400 * 1024 * 1024}"/>
                </bean>
            </property>
        </bean>
    </property>

One cache config, other are more of this only the name would change,

<bean class="org.apache.ignite.configuration.CacheConfiguration">
                <property name="name" value="cache1"/>
                <property name="atomicityMode" value="ATOMIC"/>
                <property name="backups" value="1"/>
            </bean>