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List of issues#2744 how to change memory limit
Author: 
flashfan
flashfanDate created:
Type: question
Visibility: Everybody
Assigned to:
Labels: GUI
State: opened 
recently i've noticed that the amount of RAM available for use (that's what i assume that
thing in the corner is for) decreased almost ten times which made me ask that question:
how do i change it?
Снимок экрана 2026-08-04 182555.png (140 KiB)
The two numbers on the widget X/Y mean
actually used memory right now vs total allocated memory reserve at the java "heap".
When so called operation "Garbage collection" is executed, the graph goes down and the
numbers decrease, it is normal. You can run GC manually by clicking the graph.
If you want to modify maximum RAM the decompiler can use,
then do it by setting environment variable FFDEC_MEMORY.
For example FFDEC_MEMORY=1024m
You can also set it by editing ffdec.bat on Windows or ffdec.sh on Linux/MacOS.
Running ffdec.exe on Windows always sets the maximum of memory to maximum available
memory,
so if you want the variable to be used, run ffdec.bat instead.
Just the info for other users:
The memory heap information widget can be enabled in Advanced settings - "Show heap status
widget".
State: new→opened