Message-ID: <CAAYoRsUhusVzOnaGHjPoMWYy2_iPFAjFLoCrj6vSX26EHNWGiw@mail.gmail.com>
Date:   Fri, 15 Sep 2023 15:16:37 -0700
From:   Doug Smythies <dsmythies@...us.net>
To:     Mario Limonciello <mario.limonciello@....com>,
        Swapnil Sapkal <swapnil.sapkal@....com>
Cc:     rafael.j.wysocki@...el.com, Ray.Huang@....com, li.meng@....com,
        shuah@...nel.org, 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>,
        Doug Smythies <dsmythies@...us.net>
Subject: Re: [PATCH 2/2] tools/power/x86/intel_pstate_tracer: Use pygnuplot
 package for Gnuplot

On Fri, Sep 15, 2023 at 2:31 PM Mario Limonciello
<mario.limonciello@....com> wrote:
> 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/

Yes, I found that earlier.
For my part of it, I do not want to use any out-of-distro package.

> 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.

I already did the python 3 patch in January, 2020:
commit e749e09db30c38f1a275945814b0109e530a07b0
tools/power/x86/intel_pstate_tracer: changes for python 3 compatibility

I haven't had any issues since, shebang aside.

... Doug

> 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

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