Fix incorrect y-axis scaling

[gohar94]

When plotting read and writes together as a line graph, the y-axis scale is incorrect.
Following commands can be used to reproduce this:

Incorrect:

fio-plot -i Foo -T "Bug" -g -t lat -n 1 -d 16 -r randrw --xlabel-parent 0 --filter write read

Correct:

fio-plot -i Foo -T "Bug" -g -t lat -n 1 -d 16 -r randrw --xlabel-parent 0 --filter write
fio-plot -i Foo -T "Bug" -g -t lat -n 1 -d 16 -r randrw --xlabel-parent 0 --filter read

When plotting reads and writes separately, the output is correct. When plotting them together, the y-axis scale is incorrect.

[louwrentius]

Thanks for reporting the issue and providing a fix!
I'll test and deploy an updated version in the coming days.

[louwrentius]

@gohar94 I made a clone of your repo and used some test data and I think it's still broken. My data contains write data that individually scales to microseconds(us) and read data that scales to milliseconds.

I still get buggy graphs like this:

I'll have to investigate this issue further. When both read/write data is graphed, the code has to settle on one scale and scale both read and write data accordingly, which doesn't seem to happen I guess.

[triii10]

The fix for scaling the y-axis should be a simple fix. Created this pull request #148 with the fix