Lagging at 1-second intervals, but only in the VAB and *NOT* due to garbage collection

[SpacedInvader]

I'm running into an issue with a heavily modded install where I'm getting a lag spike every second in the VAB (even the kerbals on the floor stop moving momentarily), but according to MemGraph, garbage collection is happening at much larger intervals (15-150 seconds). Oddly, the problem is far more pronounced at the beginning of a career mode save than in a sandbox game, which leads me to believe that this isn't a part count issue as the latter has a significantly larger number of parts available in the VAB yet manifests the issue considerably less (almost to the point of being unnoticeable). I've been scanning the logs for clues, but there doesn't seem to be any serious errors being thrown in the VAB that might lead to performance issues, yet I can't be sure because I've never been all that great at understanding exactly whats being said in the logs when it comes to errors. There is another interesting component of this in that MemGraph is indicating that far more memory is being used in the career mode game than the sandbox mode (between 10x-20x), which reinforces the idea, for me at least, that this issue is the result of a mod that is active for a career mode game, but not for a sandbox mode game. I've been slowly trying to work through my mod list to figure out which are active only for the career mode, but I'm really not sure the best way to go about this process, so I've been reloading the game with several different mods disabled each time. Unfortunately, with over 200 mods and an approximately 15-20 minute load time to get to the main menu, this is going to take an extremely long time to sort out in this method.

Which brings me to this post. There are a couple of reasons I'm posting this request for help. First, is there a more time efficient way to identify which mods are active in career mode and not in sandbox mode so I can target my testing more effectively? Second, I'm really hoping someone with a better understanding of the log outputs will be able to scan over my logs to see if they can spot either some errors that would be causing this behavior, or some indication of a culprit mod being loaded and taking up a huge amount of processing time / memory at 1-second intervals. To this end, I'm going to be posting copies of my output / ksp logs at several points in the game in the hopes that someone can make a comparative analysis that I've not been able to do. Anyway, I really hope someone can help me sort this out because, while I might eventually get there on my own, my best guess is that it will take me several days of doing nothing but loading / reloading the game in my free time to track down the issue.

Thanks

 

Archive with all the KSP / output_log files. Each is named according to when it was taken. To the the best possible options for comparative analysis, I've taken a copy after loading at the main menu and then one each for both career and sandbox mode after reaching the space center, after loading into the VAB and after adding a Stayputnik in the VAB.

Here is the file

 

I'm also including a series of screenshots of the MemGraph window as visual aids for what I'm experiencing:

https://imgur.com/a/8hDy9qW

As can be seen in the images, GC is occurring at relatively large intervals, even in the career mode save, while the stuttering I'm experiencing is occurring at almost exactly 1-second intervals.

 

EDIT: Added current mod list for reference. All mods (except maybe 2-3 part only mods) are said to be working in the current version of the game by users in their respective threads, though this is not necessarily all that reliable of a testing method.

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Edited March 26, 2019 by SpacedInvader

[Lisias]

Try MEMGRAPH. it has a trick that forces the heap to grow, making the GC a bit less cranky. 

Your mileage may vary, but it usually works for me.

[SpacedInvader]

3 minutes ago, Lisias said:

Try MEMGRAPH. it has a trick that forces the heap to grow, making the GC a bit less cranky. 

Your mileage may vary, but it usually works for me.

Clearly you didn't actually read my post as I've literally included a link to an imgur album depicting my situation using MemGraph...

[Lisias]

1 minute ago, SpacedInvader said:

Clearly you didn't actually read my post as I've literally included a link to an imgur album depicting my situation using MemGraph...

You tried the heap-trick? 

[SpacedInvader]

1 minute ago, Lisias said:

You tried the heap-trick? 

Yes, it didn't help, even when increasing the total heap up to 4GB. As you can see in the images, even without the heap trick active (which is the case for those images), GC is occurring at much larger intervals that the lag / stuttering that I'm experiencing. My VAB is lagging literally every second while GC is only occurring every 15 seconds at most.

[Lisias]

The second most common reason for regular stuttering are Exceptions being thrown on the FixedUpdate callback.

Check your KSP.log for the string "[ERR" on the beggining of the line, and also for "Exception" anywhere.

You should find a regular stream of Exceptions, followed by a StackDump. The name of the class where the exception happened usually pinpoints the faulty component. 

[JeromeCareebo]

Decided to make my first post here because I feel your pain. I’m running a similar mod set and scrap yard, Kerbal Construction time and FMRS seemed to be the cause. Just for a reference, I’m running on an i7-4770 with a mostly clean log. 

[SpacedInvader]

9 minutes ago, Lisias said:

The second most common reason for regular stuttering are Exceptions being thrown on the FixedUpdate callback.

Check your KSP.log for the string "[ERR" on the beggining of the line, and also for "Exception" anywhere.

You should find a regular stream of Exceptions, followed by a StackDump. The name of the class where the exception happened usually pinpoints the faulty component. 

The only series of exceptions in the entire log are related to the "Field Science" contract pack though they are not followed by a stackdump. I will try removing that to see if this may be a cause / contributing factor.

 

5 minutes ago, JeromeCareebo said:

Decided to make my first post here because I feel your pain. I’m running a similar mod set and scrap yard, Kerbal Construction time and FMRS seemed to be the cause. Just for a reference, I’m running on an i7-4770 with a mostly clean log. 

This is a distinct possibility because of the fact that KCT is not active in the sandbox mode save. Not sure about FMRS and I don't have Scrap Yard. Testing now.

[SpacedInvader]

1 hour ago, JeromeCareebo said:

Decided to make my first post here because I feel your pain. I’m running a similar mod set and scrap yard, Kerbal Construction time and FMRS seemed to be the cause. Just for a reference, I’m running on an i7-4770 with a mostly clean log. 

So this appears to be the solution. Removing KCT caused career memory usage to match that of sandbox and removed the stuttering. I'll have to take this issue over there now.

Thanks for the help

[Lisias]

2 hours ago, JeromeCareebo said:

Decided to make my first post here because I feel your pain. I’m running a similar mod set and scrap yard, Kerbal Construction time and FMRS seemed to be the cause. 

That's unexpected. Do you bored to test them individually? 

It's sometime since I used FMRS, and it didn't "stuttered" my setup at that time. Can't talk about the others. 

[linuxgurugamer]

2 hours ago, JeromeCareebo said:

Decided to make my first post here because I feel your pain. I’m running a similar mod set and scrap yard, Kerbal Construction time and FMRS seemed to be the cause. Just for a reference, I’m running on an i7-4770 with a mostly clean log. 

@JeromeCareebo @SpacedInvader

Could I ask you both to make a minimal install with KCT and see what happens?

[SpacedInvader]

4 hours ago, linuxgurugamer said:

@JeromeCareebo @SpacedInvader

Could I ask you both to make a minimal install with KCT and see what happens?

I've done as you asked and gotten the same results with just KCT + Memgraph as I'm getting with all the mess of mods I've got in my normal install, going to put the results in the KCT thread to keep things all in one place.