Terracotta Discussion Forums (LEGACY READ-ONLY ARCHIVE)

Hi,

I may not be using some configuration properties properly.

Here is the cache config without having any disk storage:

<cache name="InMemAndBigMemTest"
eternal="true"
maxEntriesLocalHeap="10000000"
overflowToOffHeap="true"
maxBytesLocalOffHeap="2G"
copyOnRead="false"
statistics="true"
memoryStoreEvictionPolicy="LFU">
<persistence strategy="none"/>
</cache>

It took about 15 sec to insert 1.5million records.

I changed the configuration to:

<cache name="InMemAndBigMemTest"
eternal="true"
maxEntriesLocalHeap="10000000"
overflowToOffHeap="true"
maxBytesLocalOffHeap="2G"
copyOnRead="false"
statistics="true"
memoryStoreEvictionPolicy="LFU">
<persistence strategy="localTempSwap"/>
</cache>

My understanding was that the disk persistence would be used when the off heap becomes full. I was expecting the same performance for the insertion of 1.5million records. However, it took, ~7 minutes!!

It completely baffles me... Can someone explain or point me in the right direction?

Thanks much!!

The disk persistence settings do not work in that way. If you run with localTempSwap on it will put everything to disk initially. The offheap and heap will act as read caches for that disk layer. This is why you don't see the write throughput you expect.

Thanks so much Chris.

So, what would be the right configuration to use the disk after the local and off-heap are full respectively.

Thanks much!