Jump to content
Sign in to follow this  
pm_dude

Cura multi threading - what is and what's next

Recommended Posts

Posted · Cura multi threading - what is and what's next

Hello,

Now I know it was discussed before and many simply requested to multi thread cura for slicing without really knowing the involvements. I'm partially a tool programmer (not a software engineer) so I can understand involvements and like to optimize time and workflows in general.

From my understanding the nozzle path is the most difficult part to separate since you need to know start the from the previous layer and dont know where you will end. But I'm wondering if anything else is/could be threaded at the moment.

If this topic came up already please save everyone some time and redirect :D

Here are some things I have in mind:

- support generation

- brim/skirt/raft

- slicing (not defining the path)

- infill

- starting the path before all the above are complete

In many cases all the above seems to generate fast but with big and complex models even those can take a while.

 

Cheers

 

Share this post


Link to post
Share on other sites
Posted · Cura multi threading - what is and what's next

Thanks. Its a good summary. Knowing how it's currently splitted it would require quite some work to thread it

Share this post


Link to post
Share on other sites
Posted · Cura multi threading - what is and what's next

Technically speaking, cura is already threaded because the GUI and the engine are separate processes (and therefore threads).

The actual toolpath generation is the most expensive step and this will be the hardest part to do so. I believe it should be possible to do the support structured in a separate thread. The main reason why this isn't done is because it adds a whole lot of complexity (and makes debugging way, way harder).

 

Share this post


Link to post
Share on other sites
Posted · Cura multi threading - what is and what's next

Yes this is what I think too. In most cases the gain wont be huge time saver but just to give you an example I'm printing an item that require supports and the print time jump from 19 hours to about 40 when adding supports. The slicing time take about 10-15 minutes. The first slicing works the next one will never end (thats weird).

If the toolpath could work in reverse mode you could split this process in 2. One half of the model go upward like normal and one half go downward from the middle to the bottom. This way you can have a known starting point for both. Or there would be a need to be able to tell it where to end the layer. Or add retraction toolpath to bring 2 sections together.

I'm sure you guys already talked about these options in the past and threading can be a pain in the butt...

Share this post


Link to post
Share on other sites
Posted · Cura multi threading - what is and what's next

The main reason why I'm not using multi-threading is to save in code complexity. Not because it cannot be done. There are a few loops in the engine that could be multi-threaded with ease. Which would run about 60% of the code threaded instead of single threaded.

 

Share this post


Link to post
Share on other sites
Posted · Cura multi threading - what is and what's next

Between that and new features I prefer you guys work on those awesome new features :D

Share this post


Link to post
Share on other sites
Posted · Cura multi threading - what is and what's next

But at some point it will probably become relevant to do it considering new pc add cores instead of boosting clock speed.

Share this post


Link to post
Share on other sites
Posted · Cura multi threading - what is and what's next

But at some point it will probably become relevant to do it considering new pc add cores instead of boosting clock speed.

 

Oh, most certainly, but I rather delay this addition. Also because there is lots of work on compilers being done to make this easier (openmp) but this isn't fully supported by all my target platforms yet.

 

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Sign in to follow this  

  • Our picks

    • Ultimaker Cura 4.0 | Stable available!
      Ultimaker Cura 4.0 is mainly focused on the improved user interface and cloud integration.
      As always, we want to collect your user feedback for this release. If there are any improvements you can think of, feel free to mention it here and help us to shape the next release.
      • 98 replies
×
×
  • Create New...

Important Information

Welcome to the Ultimaker Community of 3D printing experts. Visit the following links to read more about our Terms of Use or our Privacy Policy. Thank you!