Re: LMDB on Ramdisk (tmpfs)

Luca Foppiano wrote:

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On 22 Mar 2018, at 11:37, Howard Chu hyc@symas.com wrote:

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According to my understanding the memory is dirty when 1)there are open transactions, 2) the data has not been written back to the filesystem

Your understanding is incorrect. Dirty pages remain dirty until they are written to stable storage (e.g., disk). A tmpfs/RAMdisk has no stable storage, all of its pages reside only in RAM. That's the point of a RAMdisk.

Ok, thanks for have it clarified. I was just “hoping” LMDB would have not notice the type of storage was syncing to.

And LMDB doesn't. The behavior you see is due to how tmpfs works.