RE: Mainline kernel OLTP performance update

[Styner, Douglas W]

Wilcox, Matthew R writes:
>I'm not sure that Orion is going to give useful results in your hardware
>setup.  I suspect you don't have enough spindles to get the IO rates that
>are required to see the problem.  How about doing lots of contiguous I/O
>instead?  Something as simple as:
>
>for i in sda sdb sdc (repeat ad nauseam); do \
>	dd if=/dev/$i of=/dev/null bs=4k iflag=direct & \
>done
>

A better workload emulator would be to use FIO to generate ~60%/40% reads/writes with ~90-95% random i/o using 2k blksize.  There is some sequential writing in our workload but only to a log file and there is not much activity there.
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