BigMemory can now provide up to 256GB of in-process, off-heap memory in a single JVM. It's also trivially easy to implement:
Step One: Update the Java classpath and startup arguments to include the new
ehcache-2.3 jar and allocate sufficient memory for the BigMemory off-heap
Step Two: Update the cache configuration in ehcache.xml to set the size of the
BigMemory off-heap store.
<ehcache>More discussion on the nuances of BigMemory can found here.
<cache name="mycache" maxElementsInMemory="10000"
Pandey said that Terracotta had already sold BigMemory to some companies before they were out of beta. Some of Terracotta's beta testers included financial institutions, and the web division of News Corps. The customer stories he shared with us included a French company that was able to cut its 25 VMware instances down to just two because of BigMemory. Companies reported 2x throughput with half the latency. An e-commerce site found BigMemory to be especially time-saving when it took them about three hours to get their application running within the confines of their uncommonly stringent SLA (Service Level Agreement). Before BigMemory, that tuning took three months.
BigMemory is an add-on to Enterprise Ehcache, and its pricing starts at $500 per gigabyte annually. See Himadri Singh's performance tests here.