Unity Bug

Periodic hiccups

Lazlo Bonin (Lead Developer) 5 months ago • updated 3 days ago 9
Bolt Version:
Unity Version:
.NET Version:
Bolt 2

Still occurs in alpha 2!

Under Review

So we investigated this, and it doesn't seem related to the C# preview.

It actually starts happening usually after a full extract. The the GC starts freaking out and freeing a little amount of memory every few seconds, which takes a long time. 

I have yet to test more, but it might also be related to documentation generation during the full extract. Perhaps disabling this (which you can do in the new Options tab of the Extractor in Alpha 3) could help.

In most cases, restarting Unity fixed it. In some cases though, it didn't, which is beyond surprising to me!

Still happens in alpha 3. I ran full extract after installing Bolt on a fresh project. The stutters are also noticeable in play mode.

Video with play mode fps drops/stutters: https://www.dropbox.com/s/qymri0hpahcexwu/2018-12-24_17-52-41.mp4?dl=0

Unity restart does not fix this for me. Disabling all documentation options in extractor also seemingly doesn't improve the situation.

Bolt Version: 2.0.0a3 

Unity Version: 2018.3.0f2

NET Version: 4.x

Yup, installed alpha, did an extract during the setup.  Closed Unity (as Bolt seems to like that after the initial import) and reopened, and the hiccup is still there.

Exact same Unity and settings as TowerCrow.

The stuttering to a lesser extent also happens in 1.4.1b3. Video: https://www.dropbox.com/s/r9uywva82npg24y/2018-12-29_01-38-01.mp4?dl=0U

It's a fresh project with just Bolt in it. The flow machine is on a square 2D sprite with a Rigidbody2D component on it. The flow only contains this:


Thanks for the report everyone, we're definitely able to reproduce, we're just still puzzled as to why it happens at all. This is definitely a high-priority issue for Bolt 2.

Unity Bug

Reported to Unity and confirmed as a bug introduced in 2018.3.

Issue Tracker: https://issuetracker.unity3d.com/issues/gc-dot-collect-is-called-at-regular-intervals-causing-noticeable-lag-spikes-when-using-bolt-asset

FogBugz: https://fogbugz.unity3d.com/default.asp?1130308_u42rbj11cojvd2i6

Reportedly fixed in 2019.2a: https://unity3d.com/alpha/2019.2

I'll follow up to make sure it gets backported to 2018.4 LTS.

First, they say it's fixed but then they come back and say it's only a partial fix yet the ticket is closed? Weird.

Yup, I'm puzzled and disappointed too. I'll keep a close look on the 2018.3 changelogs to see when the fix lands and I'll have to test for myself.

If the bug is still somewhat there, it means a lot of the core Bolt unit options will have to be redesigned to avoid memory allocation altogether. But that also means slowing down search significantly.