[CentOS] CENTOS 5.5 X86 continue get "out of memory" error?????

John R Pierce pierce at hogranch.com
Thu Nov 25 02:09:36 EST 2010


On 11/24/10 11:06 PM, cpolish at surewest.net wrote:
> http://www.centos.org/docs/4/html/release-notes/as-x86/
> Red Hat Enterprise Linux 4 includes a kernel known as the hugemem
> kernel. This kernel supports a 4GB per-process user space (versus 3GB
> for the other kernels), and a 4GB direct kernel space. Using this kernel
> allows Red Hat Enterprise Linux to run on systems with up to 64GB of
> main memory. The hugemem kernel is required in order to use all the
> memory in system configurations containing more than 16GB of memory. The
> hugemem kernel can also benefit configurations running with less memory
> (if running an application that could benefit from the larger
> per-process user space, for example.)

that kernel will also greatly increase overhead of all system calls as 
they will require pagetable swaps on every transition from user -> 
kernel and back, and any arguments to kernel calls will have to be 
copied to a static shared buffer (and results copied back).   large 
arguments will be particularlly ugly.





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