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strange file query

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  strange file query ghe2001 <ghe2001@pm.me> - 2022-01-16 21:50 +0100
    Re: strange file query <tomas@tuxteam.de> - 2022-01-16 22:00 +0100
      Re: strange file query ghe2001 <ghe2001@protonmail.com> - 2022-01-16 22:10 +0100
        Re: strange file query piorunz <piorunz@gmx.com> - 2022-01-16 22:20 +0100
          Re: strange file query ghe2001 <ghe2001@protonmail.com> - 2022-01-16 23:50 +0100
            Re: strange file query <tomas@tuxteam.de> - 2022-01-17 07:30 +0100
        Re: strange file query Ben Caradoc-Davies <ben@transient.nz> - 2022-01-16 23:40 +0100
        Re: strange file query <tomas@tuxteam.de> - 2022-01-17 07:30 +0100
          Re: strange file query piorunz <piorunz@gmx.com> - 2022-01-17 13:10 +0100
            Re: strange file query ghe2001 <ghe2001@protonmail.com> - 2022-01-17 18:10 +0100
              Re: strange file query Peter Hillier-Brook <phb@hbsys.plus.com> - 2022-01-17 19:20 +0100
              Re: strange file query Andrei POPESCU <andreimpopescu@gmail.com> - 2022-01-21 18:50 +0100
                Re: strange file query ghe2001 <ghe2001@protonmail.com> - 2022-01-21 21:50 +0100

#244077 — strange file query

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In my home dir, there's a dir called .cache/mesa_shader_cache.  It contains a file called 'index.'  man knows nothing about the dir.  The web seems to say it has something to do with AppArmor; in another place it says "the distro is dead."  The file 1.3MB and contains nothing but 0x00s, according to hexedit.  ls -lh says 'index' is owned by me, and has -rw-r--r-- permissions.

Anybody know what they are and what they're doing there?  Can I delete them?

--
Glenn English


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#244078

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On Sun, Jan 16, 2022 at 08:25:25PM +0000, ghe2001 wrote:
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> 
> In my home dir, there's a dir called .cache/mesa_shader_cache.

This looks like some cache data for the Mesa [1] 3D graphics rendering
library.

Cheers

[1] https://en.wikipedia.org/wiki/Mesa_(computer_graphics)

-- 
t

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#244079

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‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Sunday, January 16, 2022 1:51 PM, <tomas@tuxteam.de> wrote:

> On Sun, Jan 16, 2022 at 08:25:25PM +0000, ghe2001 wrote:
>
> > -----BEGIN PGP SIGNED MESSAGE-----
> > Hash: SHA256
> > In my home dir, there's a dir called .cache/mesa_shader_cache.
>
> This looks like some cache data for the Mesa [1] 3D graphics rendering
> library.

Looking at your link to Wikipedia, it does indeed seem to have something to do with Mesa (there's a paragraph in there about 'shader').  But I've never heard of Mesa, and I certainly didn't install it.

This sounds like one vote for deletion.  Or maybe .8 votes :-)

--
Glenn English


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#244081

On 16/01/2022 21:07, ghe2001 wrote:
> Looking at your link to Wikipedia, it does indeed seem to have something to do with Mesa (there's a paragraph in there about 'shader').  But I've never heard of Mesa, and I certainly didn't install it.
>
> This sounds like one vote for deletion.  Or maybe .8 votes:-)

Mesa is installed by default very often, in many DE. Certainly is on
mine, I know because I use it.
Applications which use OpenGL to draw like browsers or multimedia
programs may also use it, it's not only for games.

Quick 1 minute DDG search, second link, reveals:

"basically, any application which uses OpenGL (Mesa) might try to use
the shader cache directory."

If you delete this directory, probably it will get recreated.
Check what mesa packages you have installed:
dpkg -l | grep mesa | awk {'print $2'}

--
With kindest regards, Piotr.

⢀⣴⠾⠻⢶⣦⠀
⣾⠁⢠⠒⠀⣿⡁ Debian - The universal operating system
⢿⡄⠘⠷⠚⠋⠀ https://www.debian.org/
⠈⠳⣄⠀⠀⠀⠀

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#244092

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‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Sunday, January 16, 2022 2:13 PM, piorunz <piorunz@gmx.com> wrote:

> If you delete this directory, probably it will get recreated.
> Check what mesa packages you have installed:
> dpkg -l | grep mesa | awk {'print $2'}

OK. dpkg lists a lot of libraries and drivers.  I'll just leave it alone, sucking up all that disk space.  I've apparently got a Winders wannaBe install (grumble...)

Thanks, both of you, for the help.

--
Glenn English

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#244105

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On Sun, Jan 16, 2022 at 10:40:43PM +0000, ghe2001 wrote:
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> 
> 
> 
> ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
> On Sunday, January 16, 2022 2:13 PM, piorunz <piorunz@gmx.com> wrote:
> 
> > If you delete this directory, probably it will get recreated.
> > Check what mesa packages you have installed:
> > dpkg -l | grep mesa | awk {'print $2'}
> 
> OK. dpkg lists a lot of libraries and drivers.  I'll just leave it alone, sucking up all that disk space.  I've apparently got a Winders wannaBe install (grumble...)

Hey, no. Pause for thirty seconds to think of all those stokers down
there in the boiler room having written that nifty software for you
(and, of course, for me :-D

Cheers
-- 
t

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#244090

On 17/01/2022 10:07, ghe2001 wrote:
> Looking at your link to Wikipedia, it does indeed seem to have something to do with Mesa (there's a paragraph in there about 'shader').  But I've never heard of Mesa, and I certainly didn't install it.
> This sounds like one vote for deletion.  Or maybe .8 votes :-)

No. Leave well enough alone. Mesa is a core part of the graphics stack. 
Heaps of Debian applications use OpenGL for hardware-accelerated 
graphics rendering. Shaders are tiny programs that run on your GPU. If 
you delete this cache, it will likely be recreated, or Bad Things May 
Happen.

You will have many Mesa libraries installed as dependencies:

dpkg -l "*mesa*"

On my system (sid), this removes 100 packages (note "-s" to simulate), 
including xserver-xorg!:

apt-get purge -s -V libglapi-mesa

There are likely other direct dependencies.

Kind regards,

-- 
Ben Caradoc-Davies <ben@transient.nz>
Director
Transient Software Limited <https://transient.nz/>
New Zealand

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#244106

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On Sun, Jan 16, 2022 at 09:07:13PM +0000, ghe2001 wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA256
> 
> 
> 
> ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
> On Sunday, January 16, 2022 1:51 PM, <tomas@tuxteam.de> wrote:
> 
> > On Sun, Jan 16, 2022 at 08:25:25PM +0000, ghe2001 wrote:
> >
> > > -----BEGIN PGP SIGNED MESSAGE-----
> > > Hash: SHA256
> > > In my home dir, there's a dir called .cache/mesa_shader_cache.
> >
> > This looks like some cache data for the Mesa [1] 3D graphics rendering
> > library.
> 
> Looking at your link to Wikipedia, it does indeed seem to have something to do with Mesa (there's a paragraph in there about 'shader').  But I've never heard of Mesa, and I certainly didn't install it.
> 
> This sounds like one vote for deletion.  Or maybe .8 votes :-)

I'd check dependencies first. Some of the mesa libraries are pretty
basic infrastructure for many a program making use of your GPU for
rendering.

This is possibly one of those unsung heros working down there in the
boiler room where's hot and while nobody notices :)

Cheers
-- 
t

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#244117

On 17/01/2022 06:21, tomas@tuxteam.de wrote:
> I'd check dependencies first. Some of the mesa libraries are pretty
> basic infrastructure for many a program making use of your GPU for
> rendering.
>
> This is possibly one of those unsung heros working down there in the
> boiler room where's hot and while nobody notices:)

Indeed it is. Mesa is a hero of Linux world. Thanks to it, we have
effortless GPU acceleration available everywhere, thousands of games are
working flawlessly on Linux, even Windows games (thats also thanks to
Wine and related projects). This wasn't possible 5 or 10 years ago, Mesa
didn't existed, GPU drivers sucked big time. Happy days.

--
With kindest regards, Piotr.

⢀⣴⠾⠻⢶⣦⠀
⣾⠁⢠⠒⠀⣿⡁ Debian - The universal operating system
⢿⡄⠘⠷⠚⠋⠀ https://www.debian.org/
⠈⠳⣄⠀⠀⠀⠀

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#244130

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‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Monday, January 17, 2022 5:06 AM, piorunz <piorunz@gmx.com> wrote:

> Indeed it is. Mesa is a hero of Linux world. Thanks to it, we have
> effortless GPU acceleration available everywhere, thousands of games are
> working flawlessly on Linux, even Windows games (thats also thanks to
> Wine and related projects). This wasn't possible 5 or 10 years ago, Mesa
> didn't existed, GPU drivers sucked big time. Happy days.

Happily granted.  Lots of things I don't know about in my Debian distro.  But 1.3 megaHeros, all zero?  I can't see how that's doing anybody much good.

(I grew up, computer-wise, in the days of the 7" floppy disk -- a megaByte still feels like a lot of disk space.)

--
Glenn English


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#244132

On 17/01/2022 17:00, ghe2001 wrote:
> 
> 
> 
> ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
> On Monday, January 17, 2022 5:06 AM, piorunz <piorunz@gmx.com> wrote:
> 
>> Indeed it is. Mesa is a hero of Linux world. Thanks to it, we have
>> effortless GPU acceleration available everywhere, thousands of games are
>> working flawlessly on Linux, even Windows games (thats also thanks to
>> Wine and related projects). This wasn't possible 5 or 10 years ago, Mesa
>> didn't existed, GPU drivers sucked big time. Happy days.
> 
> Happily granted.  Lots of things I don't know about in my Debian distro.  But 1.3 megaHeros, all zero?  I can't see how that's doing anybody much good.
> 
> (I grew up, computer-wise, in the days of the 7" floppy disk -- a megaByte still feels like a lot of disk space.)

5.25" and 8" in the '70s on my planet. :-) I still have a few in my 
loft. In the '60s we used 8 Meg removable hard disks.

Peter HB

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#244285

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On Lu, 17 ian 22, 17:00:48, ghe2001 wrote:
> 
> (I grew up, computer-wise, in the days of the 7" floppy disk -- a 
> megaByte still feels like a lot of disk space.)

You generated more data than that with your first post sent to the 3000+ 
d-u subscribers, not counting replies ;)

Kind regards,
Andrei
-- 
http://wiki.debian.org/FAQsFromDebianUser

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#244289

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‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Friday, January 21, 2022 10:46 AM, Andrei POPESCU <andreimpopescu@gmail.com> wrote:

> On Lu, 17 ian 22, 17:00:48, ghe2001 wrote:
>
> > (I grew up, computer-wise, in the days of the 7" floppy disk -- a
> > megaByte still feels like a lot of disk space.)
>
> You generated more data than that with your first post sent to the 3000+
> d-u subscribers, not counting replies ;)

It wasn't me -- it was the headers, and somebody replied from a Winders OS :-)

--
Glenn English

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