Re: Measuring IOPS

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Martin Steigerwald <Martin@xxxxxxxxxxxx> writes:

> - ioengine=libaio
> - direct=1
> - and then due to direct I/O alignment requirement: bsrange=2k-16k
>
> So I now also fully understand that ioengine=sync just refers to the 
> synchronous nature of the system calls used, not on whether the I/Os are 
> issued synchronously via sync=1 or by circumventing the page cache via 
> direct=1
>
> Attached are results that bring down IOPS on read drastically! I first let 
> sequentiell.job write out the complete 2 gb with random data and then ran 
> the iops.job.

If you want to measure the maximum iops, then you should consider
driving iodepths > 1.  Assuming you are testing a sata ssd, try using a
depth of 64 (twice the NCQ depth).

Cheers,
Jeff
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