Sometimes you want to run a set of experiments on a disk, varying a
parameter between tests (in my case, iodepth, but buffer size is also a
good candidate). You then want to present the results in a nice graph.
I wrote a small wrapper around fio to do this
(https://github.com/avikivity/diskplorer), but it occurs to me that
generalized support for both in fio would be much more useful.
Possibly, you'd define a job as a template:
[aio-read]
template_start=1
template_end=100
template_step=1
(or template_ratio=1.05 for exponential growth)
iodepth=template_variable
(it's just possible that someone can come up with better syntax).
A few more options in the global section can then cause a graph to be
generated.
btw, a fast disk can easily saturate a single core using libaio, so a
multithreaded libaio ioengine would be welcome (I am currently emulating
it using multiple jobs and new_group).
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