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Thanks ! Finally a place to lookup pricing information.

Also if you are already mmap'ing some big file which needs frequent access, I do not see how this will help ?

This. A RAM based cache sounds substantially more performant. I think this may be for clients that can't do much more than swap hardware to make their setup faster. Either it's a lack of control over their OS setup, or a desire to fine-tune caching for a specific device, or a lack of ability to change existing settings.

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