Bug: context/mtxrun makes Firefox eat up cpu

Bug: context/mtxrun makes Firefox eat up cpu

[Sylvain Hubert]

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Hi,

sorry if this is not the best place to file a bug but I found no working
bug tracker for context.

Environment:
Manjaro 20.1.2, context 2020.09.20 23:02, firefox 82.0

Step to reproduce:
1. `firefox --safe-mode  # start firefox without add-ons`
2.a`context --version  # or --help, or without arguments`
2.b or: `mtxrun --script font --list --all`

Expected behavior:
Nothing surprising should happen.

Actual behavior:
Firefox suddenly eats 100% of cpu

I've noticed that `context` symlinks to `luametatex`, but the latter itself
does not trigger the bug, neither do `luatex` or `latex`, so I believe this
is a context-specific thing.

Best,
Sylvain

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___________________________________________________________________________________

Re: Bug: context/mtxrun makes Firefox eat up cpu

[Taco Hoekwater]

> On 29 Oct 2020, at 11:29, Sylvain Hubert <champignoom@gmail.com> wrote:
> 
> Hi,
> 
> sorry if this is not the best place to file a bug but I found no working bug tracker for context.

Should you not be looking for a bug tracker for firefox instead?

It looks like firefox in safe mode is perhaps trying to do something with (or waiting for ?) a shell command called ‘context’, which is presumably not related to ‘our’ ConTeXt.

You can test that by (temporarily) redirecting the ‘context’ command from ‘luametatex’ to ‘ls’ (but keep it at the same path), and see if the problem persists. If so, then it is the actual name giving problems, and then can you should file a firefox bug report because then it has nothing to do with ConText itself.

But even if the above is not the actual issue, it still sounds like a firefox problem to me.

Best wishes,
Taco

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___________________________________________________________________________________

Re: Bug: context/mtxrun makes Firefox eat up cpu

[Sylvain Hubert]

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Hi Taco,

thanks for the suggestions, but as mentioned earlier, `mtxrun --script font
--list --all` triggers the same problem as `context` does.
I guess the problem might have something to do with fonts, but since
`context` aka `luametatex` is not open source yet, I can't analyse further.

Best,
Sylvain

On Thu, 29 Oct 2020 at 12:02, Taco Hoekwater <taco@elvenkind.com> wrote:

>
>
> > On 29 Oct 2020, at 11:29, Sylvain Hubert <champignoom@gmail.com> wrote:
> >
> > Hi,
> >
> > sorry if this is not the best place to file a bug but I found no working
> bug tracker for context.
>
> Should you not be looking for a bug tracker for firefox instead?
>
> It looks like firefox in safe mode is perhaps trying to do something with
> (or waiting for ?) a shell command called ‘context’, which is presumably
> not related to ‘our’ ConTeXt.
>
> You can test that by (temporarily) redirecting the ‘context’ command from
> ‘luametatex’ to ‘ls’ (but keep it at the same path), and see if the problem
> persists. If so, then it is the actual name giving problems, and then can
> you should file a firefox bug report because then it has nothing to do with
> ConText itself.
>
> But even if the above is not the actual issue, it still sounds like a
> firefox problem to me.
>
> Best wishes,
> Taco
>
>
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to
> the Wiki!
>
> maillist : ntg-context@ntg.nl /
> http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
> archive  : https://bitbucket.org/phg/context-mirror/commits/
> wiki     : http://contextgarden.net
>
> ___________________________________________________________________________________
>

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___________________________________________________________________________________

Re: Bug: context/mtxrun makes Firefox eat up cpu

[Sylvain Hubert]

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And using safe mode here is just to make sure that the problem is not
caused by extensions.
The annoyance started long before I bothered opening firefox with an extra
argument.

On Thu, 29 Oct 2020 at 12:02, Taco Hoekwater <taco@elvenkind.com> wrote:

>
>
> > On 29 Oct 2020, at 11:29, Sylvain Hubert <champignoom@gmail.com> wrote:
> >
> > Hi,
> >
> > sorry if this is not the best place to file a bug but I found no working
> bug tracker for context.
>
> Should you not be looking for a bug tracker for firefox instead?
>
> It looks like firefox in safe mode is perhaps trying to do something with
> (or waiting for ?) a shell command called ‘context’, which is presumably
> not related to ‘our’ ConTeXt.
>
> You can test that by (temporarily) redirecting the ‘context’ command from
> ‘luametatex’ to ‘ls’ (but keep it at the same path), and see if the problem
> persists. If so, then it is the actual name giving problems, and then can
> you should file a firefox bug report because then it has nothing to do with
> ConText itself.
>
> But even if the above is not the actual issue, it still sounds like a
> firefox problem to me.
>
> Best wishes,
> Taco
>
>
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to
> the Wiki!
>
> maillist : ntg-context@ntg.nl /
> http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
> archive  : https://bitbucket.org/phg/context-mirror/commits/
> wiki     : http://contextgarden.net
>
> ___________________________________________________________________________________
>

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___________________________________________________________________________________

Re: Bug: context/mtxrun makes Firefox eat up cpu

[Sylvain Hubert]

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Update: `mtxrun --script   # without more arguments` triggers the same
problem.

On Thu, 29 Oct 2020 at 12:02, Taco Hoekwater <taco@elvenkind.com> wrote:

>
>
> > On 29 Oct 2020, at 11:29, Sylvain Hubert <champignoom@gmail.com> wrote:
> >
> > Hi,
> >
> > sorry if this is not the best place to file a bug but I found no working
> bug tracker for context.
>
> Should you not be looking for a bug tracker for firefox instead?
>
> It looks like firefox in safe mode is perhaps trying to do something with
> (or waiting for ?) a shell command called ‘context’, which is presumably
> not related to ‘our’ ConTeXt.
>
> You can test that by (temporarily) redirecting the ‘context’ command from
> ‘luametatex’ to ‘ls’ (but keep it at the same path), and see if the problem
> persists. If so, then it is the actual name giving problems, and then can
> you should file a firefox bug report because then it has nothing to do with
> ConText itself.
>
> But even if the above is not the actual issue, it still sounds like a
> firefox problem to me.
>
> Best wishes,
> Taco
>
>
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to
> the Wiki!
>
> maillist : ntg-context@ntg.nl /
> http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
> archive  : https://bitbucket.org/phg/context-mirror/commits/
> wiki     : http://contextgarden.net
>
> ___________________________________________________________________________________
>

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___________________________________________________________________________________

Re: Bug: context/mtxrun makes Firefox eat up cpu

[Taco Hoekwater]

> On 29 Oct 2020, at 12:19, Sylvain Hubert <champignoom@gmail.com> wrote:
> 
> And using safe mode here is just to make sure that the problem is not caused by extensions.
> The annoyance started long before I bothered opening firefox with an extra argument.

I am baffled then. I do not see the connection, at all. 

Best wishes,
Taco

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___________________________________________________________________________________

Re: Bug: context/mtxrun makes Firefox eat up cpu

[Sylvain Hubert]

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I've just tried chromium which behaves a bit better but still experiences a
sudden raise of cpu usage from <10% to >70% during ~1s.
I've also noticed that, even without any browser running, each time after I
compile a file with `context`, my terminal get stuck for ~1s.
So I'm pretty sure this is a context bug, probably caused by unnecessary
excessive disk operations or something.

On Thu, 29 Oct 2020 at 12:33, Taco Hoekwater <taco@elvenkind.com> wrote:

>
>
> > On 29 Oct 2020, at 12:19, Sylvain Hubert <champignoom@gmail.com> wrote:
> >
> > And using safe mode here is just to make sure that the problem is not
> caused by extensions.
> > The annoyance started long before I bothered opening firefox with an
> extra argument.
>
> I am baffled then. I do not see the connection, at all.
>
> Best wishes,
> Taco
>
>
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to
> the Wiki!
>
> maillist : ntg-context@ntg.nl /
> http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
> archive  : https://bitbucket.org/phg/context-mirror/commits/
> wiki     : http://contextgarden.net
>
> ___________________________________________________________________________________
>

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___________________________________________________________________________________

Re: Bug: context/mtxrun makes Firefox eat up cpu

[Taco Hoekwater]

> On 29 Oct 2020, at 12:44, Sylvain Hubert <champignoom@gmail.com> wrote:
> 
> I've just tried chromium which behaves a bit better but still experiences a sudden raise of cpu usage from <10% to >70% during ~1s.
> I've also noticed that, even without any browser running, each time after I compile a file with `context`, my terminal get stuck for ~1s.
> So I'm pretty sure this is a context bug, probably caused by unnecessary excessive disk operations or something.

But it seems to be a big problem only on your machine. What hardware are you running on? Is it a Raspberry PI?

Like any TeX-related program, ConTeXt does a fair bit of disk access while starting up, but I haven’t heard of that being an actual problem since the age of single-core CPUs. And it certainly should not have an effect on the CPU usage of any other program (it could affect system responsiveness, though).

Best wishes,
Taco




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___________________________________________________________________________________

Re: Bug: context/mtxrun makes Firefox eat up cpu

[Sylvain Hubert]

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> But it seems to be a big problem only on your machine
I fail to see what this implies.

> What hardware are you running on? Is it a Raspberry PI?
No, it's Core i5 + 8G ram + ssd.

> Like any TeX-related program, ConTeXt does a fair bit of disk access
while starting up.
But none of the other TeX-related programs causes such a problem here.

> And it certainly should not have an effect on the CPU usage of any other
program.
Indeed it should not have such an effect, so it failed to avoid what I
should have avoided, and that's why it's a bug to be discovered and
eliminated.

On Thu, 29 Oct 2020 at 13:56, Taco Hoekwater <taco@elvenkind.com> wrote:

>
>
> > On 29 Oct 2020, at 12:44, Sylvain Hubert <champignoom@gmail.com> wrote:
> >
> > I've just tried chromium which behaves a bit better but still
> experiences a sudden raise of cpu usage from <10% to >70% during ~1s.
> > I've also noticed that, even without any browser running, each time
> after I compile a file with `context`, my terminal get stuck for ~1s.
> > So I'm pretty sure this is a context bug, probably caused by unnecessary
> excessive disk operations or something.
>
> But it seems to be a big problem only on your machine. What hardware are
> you running on? Is it a Raspberry PI?
>
> Like any TeX-related program, ConTeXt does a fair bit of disk access while
> starting up, but I haven’t heard of that being an actual problem since the
> age of single-core CPUs. And it certainly should not have an effect on the
> CPU usage of any other program (it could affect system responsiveness,
> though).
>
> Best wishes,
> Taco
>
>
>
>
>
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to
> the Wiki!
>
> maillist : ntg-context@ntg.nl /
> http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
> archive  : https://bitbucket.org/phg/context-mirror/commits/
> wiki     : http://contextgarden.net
>
> ___________________________________________________________________________________
>

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___________________________________________________________________________________

Re: Bug: context/mtxrun makes Firefox eat up cpu

[Sylvain Hubert]

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I would consider it more constructive to admit the existence of the bug and
find a way look into the source code of luametatex, since `context --help`
is obviously not a terribly complicated routine to investigate.

On Thu, 29 Oct 2020 at 13:56, Taco Hoekwater <taco@elvenkind.com> wrote:

>
>
> > On 29 Oct 2020, at 12:44, Sylvain Hubert <champignoom@gmail.com> wrote:
> >
> > I've just tried chromium which behaves a bit better but still
> experiences a sudden raise of cpu usage from <10% to >70% during ~1s.
> > I've also noticed that, even without any browser running, each time
> after I compile a file with `context`, my terminal get stuck for ~1s.
> > So I'm pretty sure this is a context bug, probably caused by unnecessary
> excessive disk operations or something.
>
> But it seems to be a big problem only on your machine. What hardware are
> you running on? Is it a Raspberry PI?
>
> Like any TeX-related program, ConTeXt does a fair bit of disk access while
> starting up, but I haven’t heard of that being an actual problem since the
> age of single-core CPUs. And it certainly should not have an effect on the
> CPU usage of any other program (it could affect system responsiveness,
> though).
>
> Best wishes,
> Taco
>
>
>
>
>
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to
> the Wiki!
>
> maillist : ntg-context@ntg.nl /
> http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
> archive  : https://bitbucket.org/phg/context-mirror/commits/
> wiki     : http://contextgarden.net
>
> ___________________________________________________________________________________
>

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___________________________________________________________________________________

Re: Bug: context/mtxrun makes Firefox eat up cpu

[Hans Hagen]

On 10/29/2020 3:18 PM, Sylvain Hubert wrote:
> I would consider it more constructive to admit the existence of the bug 
> and find a way look into the source code of luametatex, since `context 
> --help` is obviously not a terribly complicated routine to investigate.
As taco mentioned, it's very unlikely an engine issue esp as firefox is 
somehow involved. A tex engine really does nothing special; just openign 
a few files.

What is your test file?

Hans


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___________________________________________________________________________________

Re: Bug: context/mtxrun makes Firefox eat up cpu

[Taco Hoekwater]

> On 29 Oct 2020, at 15:14, Sylvain Hubert <champignoom@gmail.com> wrote:
> 
> > But it seems to be a big problem only on your machine
> I fail to see what this implies.

The point is that if this was a common problem, many users would complain or at least respond to your message with a “me too”. So it seems likely that there is something special going on with exactly your computer or your context installation.

What binary are you using for luametatex ? The normal linux 64-bit one from the lmtx distribution?

Best wishes,
Taco



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Re: Bug: context/mtxrun makes Firefox eat up cpu

[Aditya Mahajan]

On Thu, 29 Oct 2020, Sylvain Hubert wrote:

> Hi,
> 
> sorry if this is not the best place to file a bug but I found no working
> bug tracker for context.
> 
> Environment:
> Manjaro 20.1.2, context 2020.09.20 23:02, firefox 82.0
> 
> Step to reproduce:
> 1. `firefox --safe-mode  # start firefox without add-ons`
> 2.a`context --version  # or --help, or without arguments`
> 2.b or: `mtxrun --script font --list --all`
> 
> Expected behavior:
> Nothing surprising should happen.
> 
> Actual behavior:
> Firefox suddenly eats 100% of cpu

I cannot reproduce this behavior (I am on manjaro but using firefox 81 rather than 82). My environment:

$uname -a
Linux hostname 5.4.67-1-MANJARO #1 SMP PREEMPT Wed Sep 23 14:20:18 UTC 2020 x86_64 GNU/Linux

$firefox --version
Mozilla Firefox 81.0

$context --version
mtx-context     | ConTeXt Process Management 1.03
mtx-context     |
mtx-context     | main context file: /opt/luametatex/texmf-context/tex/context/base/mkiv/context.mkiv
mtx-context     | current version: 2020.09.15 18:11
mtx-context     | main context file: /opt/luametatex/texmf-context/tex/context/base/mkiv/context.mkxl
mtx-context     | current version: 2020.09.15 18:11

I followed your steps:
1. start `firefox --safe-mode`
2. On a different terminal, open htop and filter `firefox` so I can view firefox's CPU usage.
3. Run `mtxrun --script font --list --all`

The CPU usage of firefox does not change in any appreciable way (it was 0% and remains 0%). 

It is possible for you to check on a fresh install of manjaro in a virtual machine to rule out the possibility that something else in your system is causing this behavior. 

Aditya
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___________________________________________________________________________________

Re: Bug: context/mtxrun makes Firefox eat up cpu

[Sylvain Hubert]

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> So it seems likely that there is something special going on with exactly
your computer or your context installation.
Still, I fail to see what this implies. In particular, I find it not the
most professional to assume a dust-proof environment for a real-world
product, and even unreasonable to assume that for something like `context
--help` given that no other commands are making a scene when printing help
messages.

What binary are you using for luametatex ? The normal linux 64-bit one from
the lmtx distribution?
Yes, it is.

On Thu, 29 Oct 2020 at 16:43, Taco Hoekwater <taco@elvenkind.com> wrote:

>
>
> > On 29 Oct 2020, at 15:14, Sylvain Hubert <champignoom@gmail.com> wrote:
> >
> > > But it seems to be a big problem only on your machine
> > I fail to see what this implies.
>
> The point is that if this was a common problem, many users would complain
> or at least respond to your message with a “me too”. So it seems likely
> that there is something special going on with exactly your computer or your
> context installation.
>
> What binary are you using for luametatex ? The normal linux 64-bit one
> from the lmtx distribution?
>
> Best wishes,
> Taco
>
>
>
>
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to
> the Wiki!
>
> maillist : ntg-context@ntg.nl /
> http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
> archive  : https://bitbucket.org/phg/context-mirror/commits/
> wiki     : http://contextgarden.net
>
> ___________________________________________________________________________________
>

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___________________________________________________________________________________

Re: Bug: context/mtxrun makes Firefox eat up cpu

[Sylvain Hubert]

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Hi aditya,

> It is possible for you to check on a fresh install of manjaro in a
virtual machine to rule out the possibility that something else in your
system is causing this behavior.
I remember trying context while browsing the wiki before so it should work
normally in a brand new environment, but I don't think it's reasonable to
install a brand new distro just to make sure that 'context --help' can work
normally, no matter how problematic the current distro is, as long as it
does not prevent commands from displaying help messages.

On Thu, 29 Oct 2020 at 16:50, Aditya Mahajan <adityam@umich.edu> wrote:

> On Thu, 29 Oct 2020, Sylvain Hubert wrote:
>
> > Hi,
> >
> > sorry if this is not the best place to file a bug but I found no working
> > bug tracker for context.
> >
> > Environment:
> > Manjaro 20.1.2, context 2020.09.20 23:02, firefox 82.0
> >
> > Step to reproduce:
> > 1. `firefox --safe-mode  # start firefox without add-ons`
> > 2.a`context --version  # or --help, or without arguments`
> > 2.b or: `mtxrun --script font --list --all`
> >
> > Expected behavior:
> > Nothing surprising should happen.
> >
> > Actual behavior:
> > Firefox suddenly eats 100% of cpu
>
> I cannot reproduce this behavior (I am on manjaro but using firefox 81
> rather than 82). My environment:
>
> $uname -a
> Linux hostname 5.4.67-1-MANJARO #1 SMP PREEMPT Wed Sep 23 14:20:18 UTC
> 2020 x86_64 GNU/Linux
>
> $firefox --version
> Mozilla Firefox 81.0
>
> $context --version
> mtx-context     | ConTeXt Process Management 1.03
> mtx-context     |
> mtx-context     | main context file:
> /opt/luametatex/texmf-context/tex/context/base/mkiv/context.mkiv
> mtx-context     | current version: 2020.09.15 18:11
> mtx-context     | main context file:
> /opt/luametatex/texmf-context/tex/context/base/mkiv/context.mkxl
> mtx-context     | current version: 2020.09.15 18:11
>
> I followed your steps:
> 1. start `firefox --safe-mode`
> 2. On a different terminal, open htop and filter `firefox` so I can view
> firefox's CPU usage.
> 3. Run `mtxrun --script font --list --all`
>
> The CPU usage of firefox does not change in any appreciable way (it was 0%
> and remains 0%).
>
> It is possible for you to check on a fresh install of manjaro in a virtual
> machine to rule out the possibility that something else in your system is
> causing this behavior.
>
> Aditya
>
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to
> the Wiki!
>
> maillist : ntg-context@ntg.nl /
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>
> ___________________________________________________________________________________
>

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Re: Bug: context/mtxrun makes Firefox eat up cpu

[Hans Hagen]

On 10/29/2020 5:44 PM, Sylvain Hubert wrote:
>> So it seems likely that there is something special going on with exactly 
> your computer or your context installation.
> Still, I fail to see what this implies. In particular, I find it not the 
> most professional to assume a dust-proof environment for a real-world 
> product, and even unreasonable to assume that for something like 
> `context --help` given that no other commands are making a scene when 
> printing help messages.
So what does context --help show?

Hans

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Re: Bug: context/mtxrun makes Firefox eat up cpu

[ntg]

Hi Sylvain,

This bug tracker report <https://bugzilla.mozilla.org/show_bug.cgi?id=1599329> describes lagging / freezing (which are symptoms of excessive CPU usage, of course) for versions of Firefox from 70 to 74 inclusive on Manjaro. They also report Chromium seeing the same problem.

These symptoms seem to be very similar to yours. Could you please try their steps to reproduce - namely view a video in Firefox - and do so from a fresh reboot without starting or invoking ConTeXt so we can be sure that it is excluded from the equation?

If you get excessive CPU usage following their steps then it is Firefox at fault. If you don't then it might not be - unfortunately it only narrows it down to a 'might'.

Regards,

> On 29 Oct 2020, at 11:44, Sylvain Hubert <champignoom@gmail.com> wrote:
> 
> I've just tried chromium which behaves a bit better but still experiences a sudden raise of cpu usage from <10% to >70% during ~1s.
> I've also noticed that, even without any browser running, each time after I compile a file with `context`, my terminal get stuck for ~1s.
> So I'm pretty sure this is a context bug, probably caused by unnecessary excessive disk operations or something.
> 
> On Thu, 29 Oct 2020 at 12:33, Taco Hoekwater <taco@elvenkind.com> wrote:
> 
> 
> > On 29 Oct 2020, at 12:19, Sylvain Hubert <champignoom@gmail.com> wrote:
> > 
> > And using safe mode here is just to make sure that the problem is not caused by extensions.
> > The annoyance started long before I bothered opening firefox with an extra argument.
> 
> I am baffled then. I do not see the connection, at all. 

--
Bruce Horrocks
Hampshire, UK

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Re: Bug: context/mtxrun makes Firefox eat up cpu

[Taco Hoekwater]

> On 30 Oct 2020, at 09:34, ntg@scorecrow.com wrote:
> 
> Hi Sylvain,
> 
> This bug tracker report <https://bugzilla.mozilla.org/show_bug.cgi?id=1599329> describes lagging / freezing (which are symptoms of excessive CPU usage, of course) for versions of Firefox from 70 to 74 inclusive on Manjaro. They also report Chromium seeing the same problem.

This basically says it is a bug in the video driver. 

You could test that theory by switching to a text terminal for running the ‘context’ command (assuming the text-only terminal is still accessible in Manjaro) and see whether the output of ‘context —help’ causes lag there as well. Even a really, really crappy video driver should be able to handle the output stream in full-screen text mode, so if it still lags in that environment, that moves the needle toward a problem in ConTeXt (however unlikely Hans and I think that is).

Best wishes,
Taco
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Re: Bug: context/mtxrun makes Firefox eat up cpu

[Sylvain Hubert]

[-- Attachment #1.1: Type: text/plain, Size: 2081 bytes --]

> You could test that theory by switching to a text terminal for running
the ‘context’ command (assuming the text-only terminal is still accessible
in Manjaro) and see whether the output of ‘context —help’ causes lag there
as well.

If I understand you correctly, here's what I've tried:
1. open firefox, open no webpages, so there's only one about:blank
2. ctrl+alt+2, login, `context --help`
3. (in the text interface) `htop`, firefox cpu usage rises to 100% after
~1s.


On Fri, 30 Oct 2020 at 10:07, Taco Hoekwater <taco@elvenkind.com> wrote:

>
>
> > On 30 Oct 2020, at 09:34, ntg@scorecrow.com wrote:
> >
> > Hi Sylvain,
> >
> > This bug tracker report <
> https://bugzilla.mozilla.org/show_bug.cgi?id=1599329> describes lagging /
> freezing (which are symptoms of excessive CPU usage, of course) for
> versions of Firefox from 70 to 74 inclusive on Manjaro. They also report
> Chromium seeing the same problem.
>
> This basically says it is a bug in the video driver.
>
> You could test that theory by switching to a text terminal for running the
> ‘context’ command (assuming the text-only terminal is still accessible in
> Manjaro) and see whether the output of ‘context —help’ causes lag there as
> well. Even a really, really crappy video driver should be able to handle
> the output stream in full-screen text mode, so if it still lags in that
> environment, that moves the needle toward a problem in ConTeXt (however
> unlikely Hans and I think that is).
>
> Best wishes,
> Taco
>
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to
> the Wiki!
>
> maillist : ntg-context@ntg.nl /
> http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
> archive  : https://bitbucket.org/phg/context-mirror/commits/
> wiki     : http://contextgarden.net
>
> ___________________________________________________________________________________
>

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___________________________________________________________________________________

Re: Bug: context/mtxrun makes Firefox eat up cpu

[Sylvain Hubert]

[-- Attachment #1.1: Type: text/plain, Size: 2755 bytes --]

Hi Bruce,

> Could you please try their steps to reproduce - namely view a video in
Firefox - and do so from a fresh reboot without starting or invoking
ConTeXt so we can be sure that it is excluded from the equation?

Thanks for the suggestion but firefox here has never had any issue playing
a youtube video with 6 other video pages and 20 other news pages opened at
the same time, and the bug can be reproduced here with just an about:blank
and no video opened.

On Fri, 30 Oct 2020 at 09:50, <ntg@scorecrow.com> wrote:

> Hi Sylvain,
>
> This bug tracker report <
> https://bugzilla.mozilla.org/show_bug.cgi?id=1599329> describes lagging /
> freezing (which are symptoms of excessive CPU usage, of course) for
> versions of Firefox from 70 to 74 inclusive on Manjaro. They also report
> Chromium seeing the same problem.
>
> These symptoms seem to be very similar to yours. Could you please try
> their steps to reproduce - namely view a video in Firefox - and do so from
> a fresh reboot without starting or invoking ConTeXt so we can be sure that
> it is excluded from the equation?
>
> If you get excessive CPU usage following their steps then it is Firefox at
> fault. If you don't then it might not be - unfortunately it only narrows it
> down to a 'might'.
>
> Regards,
>
> > On 29 Oct 2020, at 11:44, Sylvain Hubert <champignoom@gmail.com> wrote:
> >
> > I've just tried chromium which behaves a bit better but still
> experiences a sudden raise of cpu usage from <10% to >70% during ~1s.
> > I've also noticed that, even without any browser running, each time
> after I compile a file with `context`, my terminal get stuck for ~1s.
> > So I'm pretty sure this is a context bug, probably caused by unnecessary
> excessive disk operations or something.
> >
> > On Thu, 29 Oct 2020 at 12:33, Taco Hoekwater <taco@elvenkind.com> wrote:
> >
> >
> > > On 29 Oct 2020, at 12:19, Sylvain Hubert <champignoom@gmail.com>
> wrote:
> > >
> > > And using safe mode here is just to make sure that the problem is not
> caused by extensions.
> > > The annoyance started long before I bothered opening firefox with an
> extra argument.
> >
> > I am baffled then. I do not see the connection, at all.
>
> --
> Bruce Horrocks
> Hampshire, UK
>
>
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to
> the Wiki!
>
> maillist : ntg-context@ntg.nl /
> http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
> archive  : https://bitbucket.org/phg/context-mirror/commits/
> wiki     : http://contextgarden.net
>
> ___________________________________________________________________________________
>

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Re: Bug: context/mtxrun makes Firefox eat up cpu

[Sylvain Hubert]

[-- Attachment #1.1: Type: text/plain, Size: 2026 bytes --]

A few new experiments:
1. `firefox --headless` stays quite no matter what
2. when `gimp` is running, `context --help` causes a rise of cpu usage of
gimp up to 60% for ~1s
3. when only xfce4-terminal is running, I tried `context --help` for a few
times and for each time, one of the following experiences a cpu usage rise
up to >50% for ~1s:

libwhispermenu.so
libpulseaudio.so
xfce4-appfinder
nm-applet
Thunar
xfce4-terminal

On Fri, 30 Oct 2020 at 10:07, Taco Hoekwater <taco@elvenkind.com> wrote:

>
>
> > On 30 Oct 2020, at 09:34, ntg@scorecrow.com wrote:
> >
> > Hi Sylvain,
> >
> > This bug tracker report <
> https://bugzilla.mozilla.org/show_bug.cgi?id=1599329> describes lagging /
> freezing (which are symptoms of excessive CPU usage, of course) for
> versions of Firefox from 70 to 74 inclusive on Manjaro. They also report
> Chromium seeing the same problem.
>
> This basically says it is a bug in the video driver.
>
> You could test that theory by switching to a text terminal for running the
> ‘context’ command (assuming the text-only terminal is still accessible in
> Manjaro) and see whether the output of ‘context —help’ causes lag there as
> well. Even a really, really crappy video driver should be able to handle
> the output stream in full-screen text mode, so if it still lags in that
> environment, that moves the needle toward a problem in ConTeXt (however
> unlikely Hans and I think that is).
>
> Best wishes,
> Taco
>
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to
> the Wiki!
>
> maillist : ntg-context@ntg.nl /
> http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
> archive  : https://bitbucket.org/phg/context-mirror/commits/
> wiki     : http://contextgarden.net
>
> ___________________________________________________________________________________
>

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___________________________________________________________________________________

Re: Bug: context/mtxrun makes Firefox eat up cpu

[Hans Hagen]

On 10/30/2020 8:14 PM, Sylvain Hubert wrote:
> A few new experiments:
> 1. `firefox --headless` stays quite no matter what
> 2. when `gimp` is running, `context --help` causes a rise of cpu usage 
> of gimp up to 60% for ~1s
> 3. when only xfce4-terminal is running, I tried `context --help` for a 
> few times and for each time, one of the following experiences a cpu 
> usage rise up to >50% for ~1s:
> 
> libwhispermenu.so
> libpulseaudio.so
> xfce4-appfinder
> nm-applet
> Thunar
> xfce4-terminal
so taco's analysis about the video seems right .. are there alternative 
terminals?



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Re: Bug: context/mtxrun makes Firefox eat up cpu

[Hans Hagen]

On 10/30/2020 7:48 PM, Sylvain Hubert wrote:
> Hi Bruce,
> 
>  > Could you please try their steps to reproduce - namely view a video 
> in Firefox - and do so from a fresh reboot without starting or invoking 
> ConTeXt so we can be sure that it is excluded from the equation?
> 
> Thanks for the suggestion but firefox here has never had any issue 
> playing a youtube video with 6 other video pages and 20 other news pages 
> opened at the same time, and the bug can be reproduced here with just an 
> about:blank and no video opened.
youtube is not a terminal app so it doesn't force some video mode switch

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Re: Bug: context/mtxrun makes Firefox eat up cpu

[Sylvain Hubert]

[-- Attachment #1.1: Type: text/plain, Size: 872 bytes --]

The problem disappeared after a fresh installation of context with
everything else untouched.

On Thu, 29 Oct 2020 at 11:29, Sylvain Hubert <champignoom@gmail.com> wrote:

> Hi,
>
> sorry if this is not the best place to file a bug but I found no working
> bug tracker for context.
>
> Environment:
> Manjaro 20.1.2, context 2020.09.20 23:02, firefox 82.0
>
> Step to reproduce:
> 1. `firefox --safe-mode  # start firefox without add-ons`
> 2.a`context --version  # or --help, or without arguments`
> 2.b or: `mtxrun --script font --list --all`
>
> Expected behavior:
> Nothing surprising should happen.
>
> Actual behavior:
> Firefox suddenly eats 100% of cpu
>
> I've noticed that `context` symlinks to `luametatex`, but the latter
> itself does not trigger the bug, neither do `luatex` or `latex`, so I
> believe this is a context-specific thing.
>
> Best,
> Sylvain
>

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Re: Bug: context/mtxrun makes Firefox eat up cpu

[Sylvain Hubert]

[-- Attachment #1.1: Type: text/plain, Size: 1227 bytes --]

After dozens of compilations of various minimal examples using the newly
installed context, the problem reappeared.

Removing tex/texmf-cache does not help.

Does anyone know what files context modifies apart from tex/texmf-cache?

Sylvain

On Wed, 4 Nov 2020 at 16:01, Sylvain Hubert <champignoom@gmail.com> wrote:

> The problem disappeared after a fresh installation of context with
> everything else untouched.
>
> On Thu, 29 Oct 2020 at 11:29, Sylvain Hubert <champignoom@gmail.com>
> wrote:
>
>> Hi,
>>
>> sorry if this is not the best place to file a bug but I found no working
>> bug tracker for context.
>>
>> Environment:
>> Manjaro 20.1.2, context 2020.09.20 23:02, firefox 82.0
>>
>> Step to reproduce:
>> 1. `firefox --safe-mode  # start firefox without add-ons`
>> 2.a`context --version  # or --help, or without arguments`
>> 2.b or: `mtxrun --script font --list --all`
>>
>> Expected behavior:
>> Nothing surprising should happen.
>>
>> Actual behavior:
>> Firefox suddenly eats 100% of cpu
>>
>> I've noticed that `context` symlinks to `luametatex`, but the latter
>> itself does not trigger the bug, neither do `luatex` or `latex`, so I
>> believe this is a context-specific thing.
>>
>> Best,
>> Sylvain
>>
>

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Re: Bug: context/mtxrun makes Firefox eat up cpu

[Taco Hoekwater]

> On 5 Nov 2020, at 11:48, Sylvain Hubert <champignoom@gmail.com> wrote:
> 
> After dozens of compilations of various minimal examples using the newly installed context, the problem reappeared.
> 
> Removing tex/texmf-cache does not help.
> 
> Does anyone know what files context modifies apart from tex/texmf-cache?

None. 

Are you sure your disk(-driver) is OK?

Taco

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Re: Bug: context/mtxrun makes Firefox eat up cpu

[Hans Hagen]

On 11/5/2020 11:48 AM, Sylvain Hubert wrote:
> After dozens of compilations of various minimal examples using the newly 
> installed context, the problem reappeared.
> 
> Removing tex/texmf-cache does not help.
Removing firefoxe does ... when I open e.g. the cnn website in firefox 
(for instance to keep an eye on crazy elections), that program takes 650 
MB memory and 44% GPU while edge (or chrome) takes 270 MB mem and 3% 
GPU. Add a few more tabs and firefox will easily eat up gigs of mem.

Now, I don't know how it manages memory but the tex engine needs a few 
reasonable sized arrays but in large allocs and then it manages its own 
memory from that pool, Lua needs more mem (could be scattered due to 
allocs i guess), and soem garbage collection can kick in, and browsers 
... well i suppose lots of allocations and it also depends on the 
jasvascript vm.

So, I would not be surprised if after some runs of these programs you 
end up with scattered memory. I suppose that at some point the operating 
system (when in rest) will sort things out. When I make a format file it 
normally takes a few seconds. When I let firefox run wild on memory (top 
out mem and then let it give back some), it can take twice as much to 
make a format, but after quitting firefox it's all ok again.

Anyway, already long ago I decided that firefox is a memory hog so 
whenever I do something that takes more time than I susspect, I close 
firefox. Actually I often close browsers when i don't need them, also 
because they always seem to be busy with something (also the network).

Tex is just juggling some bytes. In the past tex and distributioen were 
considered large ... nowadays they are small compared to whatever you 
install and run. And in luametatex/context the performance bottleneck is 
lua, not the core tex engine.

Of course you could consider swithcing to another operating system.

Hans

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Re: Bug: context/mtxrun makes Firefox eat up cpu

[Sylvain Hubert]

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On Thu, 5 Nov 2020 at 12:07, Taco Hoekwater <taco@elvenkind.com> wrote:

>
>
> > On 5 Nov 2020, at 11:48, Sylvain Hubert <champignoom@gmail.com> wrote:
> >
> > After dozens of compilations of various minimal examples using the newly
> installed context, the problem reappeared.
> >
> > Removing tex/texmf-cache does not help.
> >
> > Does anyone know what files context modifies apart from tex/texmf-cache?
>
> None.
>
> Are you sure your disk(-driver) is OK?
>

tbh I'm not sure. I tried to figure that out by experimenting with
different kinds of stress tests and none of them triggered the same
problem, but I don't have much experience on this kind of problem anyway.

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