On Thu, Dec 11, 2008 at 5:37 AM, Scott Carey <[EMAIL PROTECTED]> wrote: > > > Run top, and note the largest value of the "SHR" column on all postgres > processes. Now execute the os cache eviction. Check the remaining cached > memory. > Note that it is now larger than the baseline by essentially the exact size > of the postgres shared memory. >
Isn't the shared memory on Linux non-swappable, unlike Solaris where you have an option to make is swappable ? As and when shared memory pages are accessed, they are allocated and can not be swapped out. I don't know if these pages are counted as part of the OS cache, but assuming they are, I don't see any problem with the above observation. May be you can try to write a C program which creates, attaches and accesses every page of the shared memory and check if you see the same behavior. Thanks, Pavan -- Pavan Deolasee EnterpriseDB http://www.enterprisedb.com -- Sent via pgsql-bugs mailing list (pgsql-bugs@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-bugs
