Hi Jens,
I'm trying to write an fio control file which will have several
threads, each writing to disjoint portions of a device. The size of
the portion of the device that the thread controls is determined by an
environment variable, for example "export SIZE=1g". The control file
looks something like this:
[global]
size=${SIZE}
filename=/dev/my-device
[job1]
offset=0
[job2]
offset=${SIZE}
[job3]
offset=2*${SIZE}
Unfortunately, this doesn't work with the current version of fio. It
appears that arithmetic expressions are only evaluated when a keyword
($pagesize, $mb_memory or $ncpus) is included. Further, the
expressions are evaluated by bc, which wouldn't understand "1g", so it
wouldn't work to just add a call to bc_calc in str_to_decimal.
What's the recommended way to do this? Alternatively, what do you
think would be the minimal thing to add to fio to achieve this effect?
One option is to add a new set of fio options to set up this
particular scenario--offsets that increment by an offset.
Alternatively, a mechanism to make new keywords globally would work,
if I could just make the size a keyword (or maybe all options could
implicitly be keywords?). What do you think?
Thanks,
Dan
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