Hello !
I read everywhere that it’s not possible to develop an API running in the same time that Revit.
But Dynamo and Revit are working as parallele task, communicating together …
So I’m asking myself, how it’s possible ?
A multithread process is existing ?
Thank you for your help !
Both Dynamo and Revit are predominantly single-threaded (with a few exceptions) because memory management is tricky stuff.
Dynamo works in something called the “idling event”, i.e. only when revit is not doing anything.
It might be a good idea to post what you’ve read because it’s hard to figure out what your question is.
Hi Dimitar,
Thanks for your answer here, it helped with a question I had.
I was hoping I could clarify something on the same topic.
Say for example I had a python script within dynamo that was setup to multiprocess the creation of Revit sheets, am I right in thinking that even though my python script is multi-threading I am bottlenecked by Revit’s single threading? Thus making the actual Revit process of bulk sheet creation no faster than it would be using a script thats not multiprocessed?
Apologies in advance, my understanding of this is quite rudimental
Cheers, Pete
Hi Pete,
I’m sure you know more than me about it 
But here’s a bit of discussion you might find interesting …
As I understand it, you can code whatever you want, and the code can force Revit to multi-thread… But it is extremely likely to cause a fail because Revit’s processes are very difficult to run multi-threaded and are not officially supported.
That said, this example manages it, though with big caveats
Hope that’s useful!
Mark
Thats very useful! Thanks very much Mark
Holy smokes! Awesome share @Mark.Ackerley
If I’m not mistaken, @Dimitar_Venkov has some sort of multi thread implementation here, https://github.com/dimven/SpringNodes/blob/master/py/Mesh.ToPolySurface.py