linux-kernel - Re: [PATCH 2/2] tools/power/x86/intel_pstate_tracer: Use pygnuplot package for Gnuplot

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Date:   Fri, 15 Sep 2023 16:31:00 -0500
From:   Mario Limonciello <mario.limonciello@....com>
To:     Doug Smythies <dsmythies@...us.net>,
        'Swapnil Sapkal' <swapnil.sapkal@....com>,
        rafael.j.wysocki@...el.com, Ray.Huang@....com, li.meng@....com,
        shuah@...nel.org
Cc:     sukrut.bellary@...il.com, gautham.shenoy@....com,
        wyes.karny@....com, Perry.Yuan@....com, zwisler@...omium.org,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org,
        'Srinivas Pandruvada' <srinivas.pandruvada@...ux.intel.com>
Subject: Re: [PATCH 2/2] tools/power/x86/intel_pstate_tracer: Use pygnuplot
 package for Gnuplot

On 9/15/2023 16:15, Doug Smythies wrote:
> On 2023.09.15 03:41 Swapnil Sapkal wrote:
> 
>> In intel_pstate_tracer.py, Gnuplot is used to generate 2D plots.
>> In current implementation this tracer gives error while importing
>> the module because Gnuplot is imported from package Gnuplot-py which
>> does not support python 3.x. Fix this by using pygnuplot package to
>> import this module.
> 
> As described in the prerequisites section, the package name is distribution dependant.
> On my distribution the original package name is phython3-gnuplot,
> and it is working fine.
> 
> sys.version_info(major=3, minor=8, micro=10, releaselevel='final', serial=0)
> 
> I don't currently have python3-pygnuplot installed, and so this patch breaks
> the  intel_pstate_tracer for me.
> 
> So, I installed the python3-pygnuplot package, and it still didn't work, as there
> still wasn't a pygnuplot module to import.
> So, I found something called PyGnuplot.py and so changed to that and got further.
> But then it got upset with:
> 
>    File "./intel_pstate_tracer.py.amd", line 298, in common_gnuplot_settings
>      g_plot = gnuplot.Gnuplot(persist=1)
> NameError: name 'gnuplot' is not defined
> 
> I gave up and returned to the unpatched
> intel_pstate_tracer.py
> And checked that is still worked fine. It did.
> 
> So, I do not accept this proposed patch.
> 
> Not really related, but for a few years now I have been meaning to
> change the minimum python version prerequisite to >= 3.0 and
> to change the shebang line from this:
> 
> #!/usr/bin/env python
> 
> To this:
> 
> #!/usr/bin/env python3
> 
> I have to use the latter version on my distro.
> Back when I looked into it, things were inconsistent,
> so I didn't know what to do. The kernel tree has 52 .py files
> of the latter shebang and 11 of the former.
> 
> ... Doug

Presumably this is the one that Swapnil intended:

https://pypi.org/project/py-gnuplot/

It requires python3, so I think if upgrading to this one the script does 
need to be switched to python3.  Besides the shebang, you should also 
use a helper like 2to3 to look for any other changes.

There were 97 hits for 'gnuplot' at pypi.  2 stood out but at least in 
the case of gnuplot based stuff, I think it's worth dropping
a comment that links back to pypi page for the intended package.

Another alternative is to include a 'requirements.txt' file that pip can 
pick up.

https://pip.pypa.io/en/stable/reference/requirements-file-format/


> 
>> Signed-off-by: Swapnil Sapkal <swapnil.sapkal@....com>
>> ---
>> tools/power/x86/amd_pstate_tracer/amd_pstate_trace.py      | 1 -
>> tools/power/x86/intel_pstate_tracer/intel_pstate_tracer.py | 4 ++--
>> 2 files changed, 2 insertions(+), 3 deletions(-)
>>
>> diff --git a/tools/power/x86/amd_pstate_tracer/amd_pstate_trace.py b/tools/power/x86/amd_pstate_tracer/amd_pstate_trace.py
>> index 2448bb07973f..14f8d81f91de 100755
>> --- a/tools/power/x86/amd_pstate_tracer/amd_pstate_trace.py
>> +++ b/tools/power/x86/amd_pstate_tracer/amd_pstate_trace.py
>> @@ -27,7 +27,6 @@ import re
>>   import signal
>>   import sys
>>   import getopt
>> -import Gnuplot
>>   from numpy import *
>>   from decimal import *
>>   sys.path.append(os.path.join(os.path.dirname(__file__), '../intel_pstate_tracer'))
>> diff --git a/tools/power/x86/intel_pstate_tracer/intel_pstate_tracer.py
> b/tools/power/x86/intel_pstate_tracer/intel_pstate_tracer.py
>> index ec3323100e1a..68412abdd7d4 100755
>> --- a/tools/power/x86/intel_pstate_tracer/intel_pstate_tracer.py
>> +++ b/tools/power/x86/intel_pstate_tracer/intel_pstate_tracer.py
>> @@ -32,7 +32,7 @@ import re
>>   import signal
>>   import sys
>> import getopt
>> -import Gnuplot
>> +from pygnuplot import gnuplot
>>   from numpy import *
>>   from decimal import *
>>
>> @@ -295,7 +295,7 @@ def common_all_gnuplot_settings(output_png):
>> def common_gnuplot_settings():
>>       """ common gnuplot settings. """
>>
>> -    g_plot = Gnuplot.Gnuplot(persist=1)
>> +    g_plot = gnuplot.Gnuplot(persist=1)
>> #   The following line is for rigor only. It seems to be assumed for .csv files
>>       g_plot('set datafile separator \",\"')
>>       g_plot('set ytics nomirror')
>> -- 
>> 2.34.1
> 
>