Vanilla 1.1.8 is a product of Lussumo. More Information: Documentation, Community Support.
@bogdanvarlamov
On the JIRA site they seem to indicate 256-512 of available RAM, however that's almost laughable since it requires Java.
http://confluence.atlassian.com/display/JIRA/JIRA+Requirements
They also note "Memory requirements depend on how many projects and issues you will store, but 256MB is enough for most evaluation purposes." To me that reads as though they're aware 256 won't really provide a great user experience.
Hope that helps.
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