问题
I am running a program in Eclipse(Windows) and need a relatively huge size of memory. Passing the -Xmx1500m to the program seems not sufficient, while Eclipse does not permit me to assign a greater value. Having this configuration I get the out-of-memory exception.
I increased the virtual memory size to 40GB. Isn't there a way to make this memory available to my program? I had easily done this in C#, for almost the same job.
回答1:
you need to run a 64Bit vm to allow more than around -Xmx1500m
You may specify that in the Run-Settings for your program and do not need to apply it in the eclipse.ini which is for eclipse itself.
BUT: it is not a good idea to give the java-vm more memory than the real (physical, free) memory on your system is, because the GC will walk through many areas of the memory when it runs and that will lead to reading/writing memory from/to disk - means swapping. And this again will lead to a very bad performance. In this case you should think about what is consuming the memory and if there is a way to manage this data externally - on disk or some MemoryBuffers.
回答2:
r u using 32 bit JVM or 64 bit? use 64 bit JVM. I am not sure about the size limitations on 64 bit , but definitely more than 32 bit.
try this: java -d64 -Xms512m -Xmx60g YourProgram
it sets 60gb as the max heap size.
回答3:
You can configure heap size in "Run Configuration Dialog".
回答4:
I think you need to increase the memory available to eclipse.
Modify -Xmx option in the eclipse.ini file (in a Windows machine).
回答5:
Where you have unzipped the eclipse, look for eclipse.ini in that modify it
回答6:
Go to your eclipse root folder where eclipse.exe file is left and you will find eclipse configuration file ( eclipse.ini ) open that file and you need following changes
来源：https://stackoverflow.com/questions/15061364/increasing-java-heap-size-in-eclipse-using-virtual-memory