CODEWITHSUNDEEP
javajvm
Christian
Christian

Reputation: 26387

Maximum heap space constraints in java

I have a program that needs a lot of memory and want to set the maximum heap space at 6024MB. Java gives me the error:

Invalid maximum heap size: -Xmx6024m
The specified size exceeds the maximum representable size.

Is there a workaround?

Upvotes: 3

Views: 3824

Answers (2)

Frank Grimm
Frank Grimm

Reputation: 1171

There are big differences between how many heap one can allocate between the different Java VMs. E.g. Sun's VM needs to allocate the memory as a single block from the OS. This limitation does not exist for Oracle's JRockit VM. It is also OS dependent -- e.g. I was able to allocate more heap with Sun's VM using Linux than was possible with Windows XP. Also note that I read somewhere that the problem goes away for 64bit OSes...

Edit:

Here's a blog entry about Sun's JVM and Java heap space issues on 32bit Windows OSes.

Upvotes: 5

Thomas Lötzer
Thomas Lötzer

Reputation: 25381

Is this a 64 bit VM? If so, you should be able to use the switch as you did.

Upvotes: 1

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