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How to move DerivedDataCache from C:/

Hey guys,

I would like to know, if I can remove or move the folder "DerivedDataCache". It's stored on my SSD (C:\Users\bobmartien\AppData\Local\UnrealEngine\4.4) even if I installed UE4 and my projects on my other Disk. This guy is more than 10Gb.

I found on Hourence that we can move it from C:/ to the project folder by adding these lines in the DefaultEngine.ini

[RocketDerivedDataBackendGraph] MinimumDaysToKeepFile=7 Root=(Type=KeyLength, Length=120, Inner=AsyncPut) AsyncPut=(Type=AsyncPut, Inner=Hierarchy) Hierarchy=(Type=Hierarchical, Inner=Boot, Inner=Pak, Inner=EnginePak, Inner=Local) Boot=(Type=Boot, Filename=”%GAMEDIR%DerivedDataCache/Boot.ddc”, MaxCacheSize=512) Local=(Type=FileSystem, ReadOnly=false, Clean=false, Flush=false, PurgeTransient=true, DeleteUnused=true, UnusedFileAge=34, FoldersToClean=-1, Path=”%GAMEDIR%DerivedDataCache”) Pak=(Type=ReadPak, Filename=”%GAMEDIR%DerivedDataCache/DDC.ddp”) EnginePak=(Type=ReadPak, Filename=”../../../Engine/DerivedDataCache/DDC.ddp”)

So, I tried it. I created a new blank project with the starter map. And added these lines in the DefaultEngine.ini (E:/Myprojectname/Config). I opened the map and now everything is lagging. It's just the starter map.

I did something wrong ? How to move DerivedDataCache from C:/ ? How I can check if it's working ?

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asked Oct 22 '14 at 05:52 PM in Installation & Setup

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bobmartien
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avatar image TimGS Oct 22 '14 at 06:19 PM

What do you have in your YourProject/DerivedDataCache folder after you opened project file?

avatar image bobmartien Oct 22 '14 at 07:28 PM

A file called Boot.ddc

avatar image Doug E ♦♦ STAFF Oct 22 '14 at 06:46 PM

Hey bobmartien-

After adding the lines you mentioned to the DefaultEngine.ini did you remove the folder from the original location? Also, in the line:

"Local=(Type=FileSystem, ReadOnly=false, Clean=false, Flush=false, PurgeTransient=true, DeleteUnused=true, UnusedFileAge=34, FoldersToClean=-1, Path=”%GAMEDIR%DerivedDataCache”)"

you may need to change "Path=..." to the location where you want the DerivedDataCache to save.

Cheers

Doug Wilson

avatar image bobmartien Oct 22 '14 at 07:28 PM

Hello Doug, thanks for helping me :) It's safe to delete this folder from my c:/ ?

avatar image Doug E ♦♦ STAFF Oct 22 '14 at 08:44 PM

Yes, it is safe to delete. Restarting the editor will recreate the folder (I believe in the new location) and it will have to recompile shaders.

avatar image bobmartien Oct 22 '14 at 11:10 PM

Hey Doug.

I did what you said. -Delete the folder from my C:/ -Add the path each tome I see '%GAMEDIR%

Now the level is open but I can't use the editor. The level take 75% of my RAM and 30% of my UC and crash.

And btw there is just Boot.dcc in the DerivedDataCache of my project.

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1 answer: sort voted first

Here is a post regarding the same issue: https://answers.unrealengine.com/questions/8585/deriveddatacache-3-gb-on-c.html

Specifically, the response by ChA1NsAw shows that you may need to add your file path to more places than the one I suggested earlier. Just make sure you change the bold part of his response to match the file path you want to you for your projects.

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answered Oct 23 '14 at 01:27 PM

avatar image bobmartien Oct 23 '14 at 02:58 PM

Okay, thanks for your help Doug !

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