Tobias Oberstein wrote:

> I am benchmarking IOPS, and while doing so, it becomes apparent that at
> these scales it does matter _how_ IO is done.
> The most efficient way is libaio. I get 9.7 million/sec IOPS with low CPU
> load. Using any synchronous IO engine is slower and produces higher load.
> I do understand that switching to libaio isn't going to fly for PG
> (completely different approach).

Maybe it is possible to write a new f_smgr implementation (parallel to
md.c) that uses libaio.  There is no "seek" in that interface, at least,
though the interface does assume that the implementation is blocking.

Álvaro Herrera      
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services

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