maximum heap size suddenly decreased
843829Aug 23 2006 — edited Aug 23 2006I have a Windows 2003 64-bit server w/ 20GB that I'm running the 32-bit VM on. For the past several months I have been able to run VMs with the maximum heap set to 1500M. Recently I am no longer able to allocate 1500M. The maximum I can get now is about 1024M. The system has over half of the physical memory available when I'm am trying this allocation.
What could cause this change in behavior? The system experienced several OS patches and upgrades recently. Is it possible that these are causing Java to be unable to allocate a 1.5GB continugous memory space? After a bit of googling and discussions with others I am told that a new DLL could potentially be splitting up my virtual address space and preventing me from ever getting a continguous allocation of more than a gig. Is there anyway to confirm this and figure out what the culprit is? I was directed to vadump or ProcessExplorer but I haven't been able to parse the output well enough to determine what's going on.
Thanks in advance.