About Me
Michael Zucchi
B.E. (Comp. Sys. Eng.)
also known as Zed
to his mates & enemies!
< notzed at gmail >
< fosstodon.org/@notzed >
Vulkan + OpenCL?
I've been slowly working on some OpenCL on Vulkan stuff using
clspv. It's a bit too hot here, my heart isn't really in it, but
I'm slowly making progress.
The last thing I checked in was an example that uses more
complicated argument passing conventions and uses a small compiler
to turn the descriptor map file from clspv into some tables used
for initialisation and argument setting. Actually
I wrote a
patch for clspv to output the data type so the compiler can
use it.
Of course along the way I hit fairly obtuse errors from vulkan
regarding extensions and options which need to be enabled for the
small kernel I wrote, but thanks to the validation layer they were
able to be resolved without too much work.
I'm working on abstracting a lot of the details away into a more
OpenCL-like API, the first few examples were stand-alone but
there's really just so much boilerplate it makes it too confusing
for an example. I've discovered a few options like
VK_DESCRIPTOR_BINDING_UPDATE_AFTER_BIND_BIT_EXT and it's
associated settings that are required for the kernels to behave
somewhat like OpenCL where you can modify kernel arguments for
subsequent submission. From my preliminary work I think most of
the behaviour can be recreated, although the more limiting factor
is the compiler and SPIR-V.
It can be found inside the opencl-args directory
of zproto-vulkan,
but I'll probably re-arrange the directory structure at some point
and continue to work on the abstraction. As of this post it's
pretty much just when I got it working at all and I didn't try to
work on the queuing mechanism.
busymon - tool to force computer breaks
I had need of a tool to remind me (forcefully) to get off the
computer and get up and walk around for a while. I was surprised
I couldn't find anything simple to do this; I came across rsibreak
but it looked like a mess to compile (i mean, cmake, obviously).
I looked a bit more but nothing looked simple.
So here's a basic computer monitor that tells you off if you're at
the computer too long - as a proxy for sitting.
As usual busymon has a
software page and
a repository.
In short my bicycle accident has lead to further complications,
possibly in part due to sitting down for too long infront of my
computer. So now i'm riddled with clots (some poetic license)
and on blood thinners and should probably try not to make it
worse. Hourly walking breaks are now doctors orders, and well,
time just flies sometimes.
amdgpu / x570 / sea islands / IO_PAGE_FAULT
After turning on the amdgpu
driver on my new system
(radeon.si_support=0 amdgpu.si_support=1
) so I could
play with vulkan it seemed nice and stable.
But I was only playing around in emacs/netbeans/firefox and wasn't
doing much with the graphics system. When I ran a JavaFX thing
i've been playing with (the genetic art) and eventually it crashed
the graphics driver. So I went back to radeon
for
the time being until I decided to look at it again.
Anyway today I had another look, and whilst logged on remotely I got the error log:
[ 993.135454] amdgpu 0000:09:00.0: AMD-Vi: Event logged [IO_PAGE_FAULT domain=0x0003 address=0xffffe05000 flags=0x0000]
[ 993.135461] amdgpu 0000:09:00.0: AMD-Vi: Event logged [IO_PAGE_FAULT domain=0x0003 address=0xffffe0a040 flags=0x0000]
[ 993.135466] amdgpu 0000:09:00.0: AMD-Vi: Event logged [IO_PAGE_FAULT domain=0x0003 address=0xffffe338c0 flags=0x0000]
[ 993.135471] amdgpu 0000:09:00.0: AMD-Vi: Event logged [IO_PAGE_FAULT domain=0x0003 address=0xffffe1d100 flags=0x0000]
[ 993.135476] amdgpu 0000:09:00.0: AMD-Vi: Event logged [IO_PAGE_FAULT domain=0x0003 address=0xffffe38900 flags=0x0000]
[ 993.135481] amdgpu 0000:09:00.0: AMD-Vi: Event logged [IO_PAGE_FAULT domain=0x0003 address=0xffffe5dd80 flags=0x0000]
[ 993.135486] amdgpu 0000:09:00.0: AMD-Vi: Event logged [IO_PAGE_FAULT domain=0x0003 address=0xffffe23580 flags=0x0000]
[ 993.135491] amdgpu 0000:09:00.0: AMD-Vi: Event logged [IO_PAGE_FAULT domain=0x0003 address=0xffffe25c00 flags=0x0000]
[ 993.135496] amdgpu 0000:09:00.0: AMD-Vi: Event logged [IO_PAGE_FAULT domain=0x0003 address=0xffffe4ed00 flags=0x0000]
[ 993.135501] amdgpu 0000:09:00.0: AMD-Vi: Event logged [IO_PAGE_FAULT domain=0x0003 address=0xffffe07a80 flags=0x0000]
[ 993.135507] AMD-Vi: Event logged [IO_PAGE_FAULT device=09:00.0 domain=0x0003 address=0xffffe52a00 flags=0x0000]
[ 993.135512] AMD-Vi: Event logged [IO_PAGE_FAULT device=09:00.0 domain=0x0003 address=0xffffe55200 flags=0x0000]
[ 993.135517] AMD-Vi: Event logged [IO_PAGE_FAULT device=09:00.0 domain=0x0003 address=0xffffe5a200 flags=0x0000]
[ 993.135521] AMD-Vi: Event logged [IO_PAGE_FAULT device=09:00.0 domain=0x0003 address=0xffffe5f2c0 flags=0x0000]
[ 993.135526] AMD-Vi: Event logged [IO_PAGE_FAULT device=09:00.0 domain=0x0003 address=0xffffe10700 flags=0x0000]
[ 993.135531] AMD-Vi: Event logged [IO_PAGE_FAULT device=09:00.0 domain=0x0003 address=0xffffe51600 flags=0x0000]
[ 993.135535] AMD-Vi: Event logged [IO_PAGE_FAULT device=09:00.0 domain=0x0003 address=0xffffe606c0 flags=0x0000]
[ 993.135540] AMD-Vi: Event logged [IO_PAGE_FAULT device=09:00.0 domain=0x0003 address=0xffffe4c7c0 flags=0x0000]
[ 993.135544] AMD-Vi: Event logged [IO_PAGE_FAULT device=09:00.0 domain=0x0003 address=0xffffe53e00 flags=0x0000]
[ 993.135549] AMD-Vi: Event logged [IO_PAGE_FAULT device=09:00.0 domain=0x0003 address=0xffffe58e00 flags=0x0000]
[ 1003.712058] [drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring gfx timeout, signaled seq=144954, emitted seq=144956
[ 1003.712116] [drm:amdgpu_job_timedout [amdgpu]] *ERROR* Process information: process Xorg pid 1301 thread Xorg:cs0 pid 1303
[ 1003.712118] [drm] GPU recovery disabled.
There wasn't a lot to be found on the internet
regarding amdgpu
but there were some other similar
problems. The suggested fix was to add iommu=soft
to the
kernel arguments. I'm trying this now and so far it looks good!
I have been tracking the 5.4.x kernel releases and thought that
might have something to do with it but fortunately not. When it
crashed initially i'd just done a slackpkg
upgrade-all
and all sorts of things broke horribly. But
that was my fault for overzealously removing packages that didn't
look important: polkit uses a lot of snot unfortunately so I broke
that. Fucking firefox lost all my settings though!
Zed's Bread Baby, ...
So I haven't been spending all my time just on the new computer,
I've also been doing some cooking. It's quite a laborious process
and the crutches keep getting in the way but most things only
require short stints standing while the oven or mixer or some
natural process takes it's course. Reminder: I'm on crutches
until after xmas due to a broken hip. I can't go anywhere or do
much or carry anything and even beer makes my foot swell up so I
can't even bloody well get drunk.
Yesterday I made a pretty good approximation of a baguette -
perhaps a bit too soft but it made a great chicken sandwich for
dinner. And today I made a '(kneaded) no-knead' bread, and a
couple of ciabatta.
I sort of fucked up the latter because the starter was too cold in
the fridge so the final dough was far too wet, but perhaps it
turned out OK. I made some last week and didn't cook it long
enough but otherwise it was an interesting bread with an almost
rubbery texture quite unlike the standard recipe.
I'm going to write down the recipes I used here in part so I
don't forget them. One might notice a lot of similarities in the
steps - well that's just how you make bread I guess.
I don't normally bother adding salt but most bread recipes include
it, perhaps 0.5 tsp. I notice the yanks put sugar in their
recipes - sometimes alarming amounts - so maybe they just need the
salt to make it palatable!
The bread improver could just be more flour. I use general
purpose flour which is a bit too weak (low protein) to make good
bread, and this helps make up for it a little bit. Adding an egg
works really well but then you need to adjust the dry/wet ratio to
account for it (just add a bit more flour usually).
Another trick which works on any of them is to spray water lightly
a few times while it's baking. This will create a shiny hard
crust by simulating a steam oven. I usually do it if i remember
to as it doesn't take much work and is a nice touch.
I use a standard-sized kenwood chef mixer, and I have a new Bosch
oven that has an almost moisture proof seal (nearly steamed my
face off a couple of times opening it). I highly recommend a
scraper (aka "baker's helper"). Finally the cooking
times are a bit arbitrary and you can always go longer if you want
more crust.
baguette
Recipe for Baguettes
Amount | Ingredient |
390g | plain flour |
10g | bread improver |
1 tsp | yeast |
260ml | water |
10ml | olive oil |
- Put the flour and yeast in the mixing bowl and add the water.
- Start the mixer with the dough hook on low until they combine
then run at speed 1 for about 15 minutes.
- Set the machine on low and add some olive oil, then turn the
machine off. Remove from the dough hook and turn until an
oil-coated ball is formed. It makes it easier to work with and
stops it drying out.
- Either leave it in the mixing bowl or transfer to another and
cover with a plate. Leave somewhere warm to double in size.
- Punch down and turn out onto a liberally floured surface and
roll out the bubbles. Cut in halves and fold over thirds several
times until a rough log is formed. A bakers scraper helps a lot
here.
- I have a funky 80s baguette form that I then place them in.
- I let them rise in my oven set to 30C, and spray some water on
them to stop them drying out. I then remove the tray from the
oven and set the baking temperature.
- Cook at 220C for about 25 minutes or until they look done.
- Remove onto a wire rack immediately once done.
Up to about 100g of the flour can be replaced by other flours like
semolina (more moist) or bulgar wheat (whole-meal like). This is
probably a bit wet for a true baguette but it makes great rolls
and buns as well.
ciabatta
Recipe for Ciabatta
Amount | Ingredient |
200g + 240g | plain flour |
200g + 200g | plain flour |
10g | bread improver |
1 tsp | yeast |
240ml + 240ml | water |
200ml + 200ml | water |
10ml | olive oil |
- Take 200g of the flour, the yeast, and 200ml of the water and
mix in a bowl until a slurry is formed. Cover and leave for
12-24 hours somewhere at a cool room temperature. It should
rise and puff up and go stringy.
- Put the remaining (200g) flour(s) in a mixing bowl. Add the
rest of the water (200ml) to the starter to help remove it and
pour that into the mixing bowl.
- Set the mixer running and let it go for about 15 minutes. Put
in the oil and try to form a (wet) ball using a scraper.
- Either leave it in the mixing bowl or transfer it to another
and cover with a plate. Leave somewhere warm to double in size.
- This is likely going to be messy. Pour from the bowl onto a
very floured surface and use the scraper and adequate flour to
form two soft logs of dough.
- I then transfer the logs to a deep baking dish with a piece of
baking paper folded in the middle to form a barrier.
- I cover that with another tray and let them rise.
- Cook at 220C for about 25 minutes or until they look well done.
- Remove onto a wire rack immediately once done.
This is a simplified version of a stupidly complex multi-stage
recipe I found on the internet. I've only made it a couple of
times so I might need to make some changes.
Update:
So this just isn't working right, yet. I tried a bit last
night and it's texture is more like a crumpet than anything else!
I'm not sure if I'm just not letting it rise enough before baking
it, or the mix is a bit too wet, although I suspect it's a bit of
both. Yesterday I ran out of hours in the day and cooked it
because the oven was hot but I probably should've left it (much)
longer. I will need to experiment more, but will try with a
reduced recipe as this makes a lot of bread!
Update: Take 2. I reduced the water and flour a
bit and let the formed loaves rise for much longer. The bread
itself is soft and 'bready' with a slight sourdough taste. The
crust is OK but not thick enough, it probably needs more time in
the oven. The dough is still so wet that it 'runs' as it proves
to fill the available space, I'm not sure how I could get around
that other than less water again. It's nice bread however.
Dutch Oven Bread
Recipe for Dutch-Oven Bread
Amount | Ingredient |
390g | plain flour |
10g | bread improver |
1 tsp | yeast |
300ml | water |
10ml | olive oil |
- Put the flour and yeast in the mixing bowl and add the water.
- Start the mixer with the dough hook on low until they combine
then run at speed 1 for about 15 minutes.
- Set the machine on low and add some olive oil, then turn the
machine off. Remove from the dough hook and turn until an
oil-coated ball is formed. It makes it easier to work with and
stops it drying out.
- Either leave it in the mixing bowl or transfer to another and
cover with a plate. Leave somewhere warm to double in size.
- Carefully turn out onto a liberally floured surface and use a
scraper to fold a few times and form into a ball. Do not punch
down.
- Line a bowl with baking paper and place the ball into the
middle. Cover them with a plate and let it rise.
- When it is nearly done rising put an enameled dutch oven with
it's cover on into the oven and pre-heat to 220C.
- Using the paper, carefully transfer the risen dough into the
put and put the lid back on.
- Bake for about 20 minutes, remove the lid, and bake for about
10 minutes more or until done. If you're keen you can remove the
paper at this point but it doesn't make a lot of difference.
- Remove onto a wire rack immediately once done.
This was based on a '2 hour' 'no-knead' bread recipe but then I
realised I was using the mixer anyway so why not just let it do
it's thing. The original made more of a bread-cake, and this
makes proper bread but with a 'rustic' look and a great crust. I
just had a piece and it's really very good.
This one can likewise have some of the flour replaced.
Workbench 2.0 Theme Updated!
So I finally gave up on KDE and went back to xfce4. The way I had
things seutp there wasn't a lot of difference but there wasn't
anything to be gained either. Login was stupendously slow but the
showstopper was not being able to drag windows to another virtual
desktop - possibly you can do it but I don't care now.
Of course xfce4 is also borked because it uses gtk3 now ... so I
wanted to fix the scrollbars. And then I wanted to have grey
backgrounds on windows ... so I ended up creating a new AmigaOS
theme for xfce4 that merges my window manager theme with a couple
of separate gtk themes I found
on www.xfce-look.org.
Go to
the Workbench
2.0 project page for further details and how to get hold of
it!
X Windows System
I also had an ugly fight with .Xdefaults and xterm settings along
the way. Slackware's xterm uses some really shitty colours and
disables things like 'bold' (which i particularly like in my
man-pages, thank-you-very-much). The magic line required to get
anything to even work is:
XTerm*customization: -color
I haven't gone through and fixed the colours yet, or worked on
emacs with a grey background but I guess I will do that eventually
as well.
And finally, I switched to xdm as my login manager. It's ugly but
it's fast as fuck and simple to use. The kde one kept wanting to
default to kde and I like the simplicity of xdm anyway.
Firefox Web Extensions
I decided to publish a couple
of trivial web extensions for firefox that I use. They just
toggle preferences settings so the extensions themselves are
completely trivial.
Unfortunately you need to use a fucking web service to make them
installable in the browser, but at least you can then install them
later using the "anus menu"
in about:addons
. Due to this i've included the
signed .xpi files in the repository.
blogz mobile
Another small update to the site that should improve the display
on mobile phones or other very narrow browsers.
Firstly it switches to mobile mode earlier at 640 pixels width
rather than 480. Images are now resized to fit when in this mode.
And I changed the tag menu to be a compact version - this required
a small change to the generator but is implemented in the css.
No idea on browser compatability but it WORKSFORME on my desktop
machine.
blogz update
Today I checked in some small changes
to blogz (the software which
runs this blog).
Primarily they move the blog index and 'etag' value from include
files to a .c file so a new post doesn't trigger an almost
complete rebuild of the application. It only takes a fraction of
a second but it was bothering me!
I also removed some over-indulgent use of meta-make.
I mentioned this on the ZedZone host page but I've also added
git-over-http checkout for all my repositorities. The checkout
url's are listed
on https://code.zedzone.au/.
Copyright (C) 2019 Michael Zucchi, All Rights Reserved.
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