Dissolve (of extrusion) takes a long, long time

[PAF-uk]

When I dissolve an extrusion or draft, I expect it to take a second or two but on my I7 laptop it takes 23 seconds.

Is this a bug?

[g-andresen]

Hi,

please share your design take a look

günther

[MoshiurRashid]

Hi

Thanks for posting. It depends on the size of your design file. Amount of features like patterns and others. Mainly, when you dissolve, fusion calculates it's result from the beginning of the creation.

So, it may take time depending on many cases.

[PAF-uk]

1. Dissolve only need to go from the point of the Extrusion or Draft and go forwards - it doesn't need to start at the beginning. So if you do the dissolve immediately after the action that created it, it should take no time at all.

2. The dissolve code runs single threaded - for today's multi-processing workstations, it really needs to be multi-threaded or use the GPU to speed things up.

[jeff_strater]

@PAF-uk - can you clarify a bit what you are doing, and supply a sample design?  When you say "dissolve", I assume you mean in the Direct Modeling environment.  If that is the case, there is no design history, and no need for recompute, so this statement:  "fusion calculates it's result from the beginning of the creation" is not really true.  However, if you are talking about deleting a feature in a history-based design, there is no "dissolve" option on features, only Delete, in which case that statement is correct.

Regarding single-threaded algorithms, that's just a fact of life for the foreseeable future.  The geometry algorithms involved pre-dated multi-core CPUs and are inherently single-threaded.

[PAF-uk]

Ok - I wanted to take out a chamfer out of a solid model, and replace face didn't work so I used draft to realign the chamfer face. Immediately afterwards I tried to disolve the Draft to make it permanent, and it takes literally 15 minutes to do this on an I7 laptop.

I am running with Capture Design History off. It is a middle sized model, in which I am modelling modifications for my 3D printer. I am happy to share the model if necessary as there is nothing secret about it.

[jeff_strater]

Thanks for the clarification.  Yes, a sample design would be helpful.

[PAF-uk]

Here is the model.

[jeff_strater]

thanks for the design, @autodeskELZGD .  Strange, I don't see that kind of performance issue.  See the screencast below.  I dissolved 3 features I found.  Each one takes about 15-20 seconds or so to complete.  Am I dissolving the same features as you?

[PAF-uk]

Yes - pretty much so. But obviously it will depend on the PC hardware it is running on.

Obviously there is not much choice in how you install Fusion 360, so it is difficult to see that it was a bad choice I made at install time. As I say, my laptop has an 8-core I7 and 24GB of memory and 2x SSD drives (and 2x hard drives). So it shouldn't have any performance problems.

But 15-20s is still a long time for a simple operation like this.

[jeff_strater]

"simple" is a matter of opinion.  There is quite a bit more to this simple operation than meets the eye, and it is dependent on model size.  It could certainly be faster, I agree.  But, the point is, you said you had observed 15 minutes for this operation, and I observed 15 seconds, so I was checking to see if we were talking about the same operation.  If there is an operation that does, indeed, take 15 minutes on a model of this size, we need to know about it.  Thanks.