Hi folks. I am using the standard SqueakVM 4.2.5beta1U. If I run normaly the VM with a normal Pharo image and I print Smalltalk garbageCollect -> I get something like 492130460 Now...if I run the vm with the parameter -memory 1500m and I then print Smalltalk garbageCollect -> I get a NEGATIVE number like: -619402660 I guess there is a problem in somewhere like ObjectMemory >> bytesLeft: but I don't know... Anyway, the problem in my case is in SmalltalkImage: okayToProceedEvenIfSpaceIsLow "Return true if either there is enough memory to do so safely or if the user gives permission after being given fair warning." self garbageCollectMost > self lowSpaceThreshold ifTrue: [^ true]. "quick" self garbageCollect > self lowSpaceThreshold ifTrue: [^ true]. "work harder" ^ self confirm: 'WARNING: There is not enough space to start the low space watcher. If you proceed, you will not be warned again, and the system may run out of memory and crash. If you do proceed, you can start the low space notifier when more space becomes available simply by opening and then closing a debugger (e.g., by hitting Cmd-period.) Do you want to proceed?' Since both of the first answers false because, of course garbageCollectMost and garbageCollect are negative.... then I have that poup all the time. To fix this I have to posibilities: 1) Just patch this particular method to: self garbageCollectMost. self primBytesLeft > self lowSpaceThreshold ifTrue: [^ true]. "quick" self garbageCollect self primBytesLeft > self lowSpaceThreshold ifTrue: [^ true]. "work harder" Notice that primBytesLeft is answering correct. Wait..I don't know if correct, but at least possitive: 5691396 I think this is possitive because the primitive is not receiving a parameter, and thus, Interpreter >> primitiveBytesLeft evaluates the first part of the method, which just does self sizeOfFree: freeBlock , and not the second part where it does self bytesLeft: aBool. 2) understand why it is negative and fix it from the VM side (I have no idea how to do this). Now, in addition, I wonder if there may be other places broken because of this....I am having some crashed and I don't know why :( Thanks in advance, Mariano