On 05/02/2013 12:04 PM, Josh Berkus wrote:

There is a good, but sad, reason for this: IBM and Oracle and their
partners are the largest employers of people hacking on core Linux
memory/IO functionality, and both of those companies use DirectIO
extensively in their products.

I never thought of that. Somehow I figured all the Redhat engineers would somehow counterbalance that kind of influence.

But that brings up an interesting question. How hard / feasible would it be to add DIO functionality to PG itself? I've already heard chatter (Robert Haas?) about converting the shared memory allocation to an anonymous block, so could we simultaneously open up a DMA relationship?

Shaun Thomas
OptionsHouse | 141 W. Jackson Blvd. | Suite 500 | Chicago IL, 60604


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