Alex Jacobson wrote:
If you create a Data.Map or Data.Set larger than fits in physical memory, will OS level swapping enable your app to behave reasonably or will things just die catastrophically as you hit a memory limit?
Relying on the OS to page portions of your app in and out should always be the fallback of last resort. You are fairly guaranteed to get terrible performance because the VM subsystem can't anticipate your app's memory access patterns, and catastrophic death of either your app or other system processes is a strong possibility (Google for "OOM killer" if you want some horror stories). In many cases, you can't even rely on paging being possible.
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