Why cannot I allocate more than -Xmx700M

[Nicklas Johnson]

2008/8/18 Sharkie <shark.fin.soup at mac.com>

>
> I get the following, which I have no idea how to read
>
> %kdump -t csu | grep -B 1 errno
>
>   1038 java     CALL
>  mmap(0,0x42800000,PROT_READ|PROT_WRITE|PROT_EXEC,MAP_PRIVATE|MAP_NORESERVE|MAP_ANON,0xffffffff,0,0)
>   1038 java     RET   mmap -1 errno 12 Cannot allocate memory
>

There's your answer.

The JVM is trying to mmap 1064MB of contiguous virtual memory, and the OS
says "no".

The limitation isn't coming from the JVM.  It's coming from the OS.  The
problem you'll need to solve is why you can't mmap more.  Either there isn't
that much contiguous virtual memory left, or you're hitting some other
system limitation.

   Nick

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