On Thu, May 15, 2014 at 11:36:51PM +0900, Amit Langote wrote:
> > No, all memory allocat is per-process, except for shared memory. We
> > probably need a way to record our large local memory allocations in
> > PGPROC that other backends can see; same for effective cache size
> > assumptions we make.
> >
>
> I see. I thought there would be some centralised way to traverse, say,
> a linked list of contexts that individual backends create or something
> like that. But, I suppose it would not be straightforward to make any
> of that work for what we are after here.
The problem is locking overhead between sessions. Right now we avoid
all of that, and I think if we just put the value in PGPROC, it will be
good enough with limited locking required.
-- Bruce Momjian <bruce@momjian.us> http://momjian.us EnterpriseDB
http://enterprisedb.com
+ Everyone has their own god. +
