The 90% Memory Warning

by Jon (Updated on 2015-10-13)

Why does this happen?

The Java runtime reserves a chunk of memory for Stencyl to use before launching -- it can't be raised after the fact. If you exceed this limit, Stencyl locks up.

So why not just set the limit very high? It causes machines with less memory to fail to launch Stencyl at all.

Although we are working to reduce memory usage and plug leaks, there are large games for which having the higher memory usage is useful. This guide explains how you can raise the limit.

Common Misconception: The 90% memory warning has nothing to do with how much RAM your computer has. You could have 128 GB of RAM and still hit this since Java's upper cap sits around 4 GB and on some systems, may be as low as 2 GB.

How to Raise the Memory Limit (Windows)

  1. Install the 64-bit version (x64) of Java 8 to your computer.

  2. Download one of the following scripts and place it into your Stencyl installation directory. (For best results, go lower than what you have -- e.g. If you have 4 GB, choose the 2 or 3 GB option.)

  3. Double-click the script to launch Stencyl from now on.

Note 1: If Stencyl fails to launch, choose a script with a lower amount of memory.

Note 2:Note: The -Xmx setting in the script may be overridden by the _JAVA_OPTIONS environment variable. See this tutorial for how to delete the variable.

How to Raise the Memory Limit (Mac)

  1. Right-click the Stencyl.app bundle and pick Show Package Contents.

  2. Using a text editor, open up Contents/MacOS/Stencyl.

  3. Search for -Xmx1536m and change the number to something higher such as 3072 (which would be 3 GB).

  4. Save the file, then relaunch Stencyl. (If your Mac complains that the app is "damaged", go to System Preferences > Security and Privacy and allow apps to be downloaded from Anywhere.)

Note: If Stencyl fails to launch after you make an edit, your number is too high. Try something smaller such as 2048.

How to Raise the Memory Limit (Linux)

  1. Edit the Stencyl shell script.

  2. Change the part that looks like -Xmx1024m to a higher number such as 3072 (which would be 3 GB).

Note: If Stencyl fails to launch after you make an edit, your number is too high. Try something smaller such as 2048 or 3072.

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Disclaimer: Use comments to provide feedback and point out issues with the article (typo, wrong info, etc.). If you're seeking help for your game, please ask a question on the forums. Thanks!


This is not working! I tried everything mentioned here and I still get the message. I have 16Gb RAM and tried from the 8gb to the 2gb dile and I’m still getting the message, what’s even worse, I get the one saying the memory ran out and it’s not saving my work. At this point Stencyl is useless! Please give us a solution ASAP!
1 5 months, 2 weeks ago
"Search for -Xmx1536m and change the number to something higher such as 3072 (which would be 3 GB)."
How do I change the number?

1 6 months, 2 weeks ago
Hello :d
like everybody else here, i need some help.
btw running on a mac.
I tried manny times now to change the number, but it always tells me it's to read Only and can not be saved.
I don't know what to do to change the memory and now stench don't really work right.
I have many times deleted my game and installed stencyl , then downloaded and installed it again.

Awaiting replay, thank you

2 6 months, 4 weeks ago
For people trying to use the files that ShakeTelevision shared -- these are good (it's what works for me), but you need to get rid of the space in the middle of the word "swing". It shouldn't be there and it won't work unless you edit the file to remove that space.
0 7 months, 3 weeks ago
For those unable to get to the links (2,3,4,6,8Gb for Windows), try the wayback machine instead. Works there...
https://web.archive.org/web/2016091 6085705/http://www.stencyl.com:80/h elp/view/ninety-percent-warning

And just incase, here they are listed below. (Do not include "2Gb", "3Gb", etc in the script, as they are just titles I've added to break them up.) See the links on the wayback machine above. See BMJs comment for what to do with it.

-XX:CompileCommand=exclude,javax/sw ing/text/GlyphView,getBreakSpot^
-jar sw.jar

-XX:CompileCommand=exclude,javax/sw ing/text/GlyphView,getBreakSpot^
-jar sw.jar

-XX:CompileCommand=exclude,javax/sw ing/text/GlyphView,getBreakSpot^
-jar sw.jar

-XX:CompileCommand=exclude,javax/sw ing/text/GlyphView,getBreakSpot^
-jar sw.jar

-XX:CompileCommand=exclude,javax/sw ing/text/GlyphView,getBreakSpot^
-jar sw.jar

1 8 months, 3 weeks ago
Never mind what I said previously, because I think I might know what to do now, but I have just one problem...I have 1GB...1GB! These scripts aren't going to help anymore are they? Because I tried the lowest of 2GB and it still didn't work.
0 11 months, 3 weeks ago
The links for Windows didn't download anything. It just led me to the code of it. And also, this isn't explained in such a way that can be easily understood. We need some pictures or at least a demonstration video to help guide other people who are having the same problem.
0 1 year, 5 days ago
Amendment to my last comment: Instead of copying/pasting, you can also just right-click the link to the batch file and select "Save link as" (it might also be called "Save target as"), but you can't save it directly to the Progam Files (x86) ----> Stencyl folder. Save it somewhere else and move it there. (I don't know why.)
0 1 year, 1 week ago
For Windows users who are wondering how to use these batch files:

Click on the link to one of the batch files -- either 2 GB, 4 GB, 6 GB or 8 GB. When the new tab opens up. Highlight and copy the text. Paste it into Notepad and save it with the extension ".bat". Move that file into the directory that has the Stencyl application in it (usually it's Program Files (x86) -----> Stencyl. After moving it into this directory, double-click the batch file and it should run Stencyl with the correct amount of memory specified in the batch file. You may need to "run as administrator" the first time. I recommend right-clicking the batch file and creating a shortcut on your desktop.

0 1 year, 1 week ago
Total noob here but also running into this issue on Windows 10, Java 8 Update 131 x64. Attempted all the above scripts, none opened the program (had to run Chrome as admin to be able to download to C:\Program Files (x86)\Stencyl), also attempted to Run As Admin.

Happy to send along logs and any other info, and looking forward to any help I can get, super excited to get into Ludum Dare!

0 1 year, 2 months ago

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