Data mingled across columns in dataset

[MerlinSmiles]

Steps to reproduce

1. Measure something with .run(use_threads=True)

Expected behaviour

Get a neat dataset

Actual behaviour

Data mingles across columns in dataset 💘

System

operating system
Win 10

qcodes branch
Master

Two identical measurements:

[MerlinSmiles]

just an example data from a different dataset, see the lines marked with love, columns 2 and 3 switch around...

-5.994    4.27718    0.0173826    0.0467188
-5.991    4.27718    0.0173826    0.0467227
-5.988    0.0173826    4.27718    0.0467227 # <3
-5.985    4.27718    0.0173826    0.0467227
-5.982    4.27718    0.0173826    0.0467227
-5.979    4.27718    0.0173826    0.0467188
-5.976    4.27718    0.0173826    0.0467227
-5.973    4.27718    0.0173826    0.0467227
-5.97    0.0173826    4.27718    0.0467227 # <3
-5.967    4.27718    0.0173826    0.0467227
-5.964    0.0173826    4.27718    0.0467227 # <3
-5.961    4.27718    0.0173826    0.0467265
-5.958    4.27718    0.0173826    0.0467265
-5.955    4.27718    0.0173826    0.0467265
-5.952    4.27718    0.0192095    0.0467303
-5.949    4.27718    0.0192095    0.0467265
-5.946    4.27718    0.0192095    0.0467265
-5.943    4.27718    0.0192095    0.0467265
-5.94    0.0192095    4.27718    0.0467265 # <3
-5.937    4.27718    0.0192095    0.0467303
-5.934    4.27718    0.0192095    0.0467303
-5.931    4.27718    0.0192095    0.0467303

[jenshnielsen]

Thats really bad. I tried reproducing it with a couple of dummy instruments but didn't see it. Are you measuring the 3 parameters from the same instrument? I am wondering if it's the driver which is not thread safe?

[giulioungaretti]

@jenshnielsen I think that's def a possibility.

[MerlinSmiles]

yup, just commented to @giulioungaretti on slack, it happens when I use two parameters on the same instrument, in this case its an SR830 lock-in

[MerlinSmiles]

and works fine with only on parameter per instrument