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

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Message-ID: <00b201d9e819$b2447e80$16cd7b80$@telus.net>
Date:   Fri, 15 Sep 2023 14:15:03 -0700
From:   "Doug Smythies" <dsmythies@...us.net>
To:     "'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>,
        <Mario.Limonciello@....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 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

> 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