Maxium Share Memory in Debian 64bit

On 02/24/12 11:41 AM, Prashant Bharucha wrote:

Hello All

Could you please help to figure out how much maxium memory can
allocated in Shared Memory on Debian 64 bit OS ?

I rarely set shared_buffers over about 2GB even on machines with 48GB or
more ram. its a case of diminishing returns, and leaving that extra
memory available for OS file system caching (as well as non-shared
things like work_mem, maintenance_work_mem) is usually the better choice.

--
john r pierce N 37, W 122
santa cruz ca mid-left coast

On Fri, Feb 24, 2012 at 12:41 PM, Prashant Bharucha
<prashantbharucha@yahoo.ca> wrote:

Hello All

Could you please help to figure out how much maxium memory can allocated in Shared Memory on Debian 64 bit OS ?

With appropriate shm settings, you can easily set it high enough to
cause problems with swapping etc. I've successfully allocated 24G in
testing on a machiine with 128G. However, in all the testing I did 8G
was the point where we no longer got any performance increase.