Re: [HACKERS] Experimental dynamic memory allocation of postgresql shared memory

On Sat, Jun 18, 2016 at 3:43 AM, Tom Lane wrote: > DSM already exists, and for many purposes its lack of a > within-a-shmem-segment dynamic allocator is irrelevant; the same purpose > is served (with more speed, more reliability, and less code) by releasing > the whole DSM

Re: [HACKERS] Experimental dynamic memory allocation of postgresql shared memory

On Sat, Jun 18, 2016 at 12:45 AM, Tom Lane <t...@sss.pgh.pa.us> wrote: > Aleksey Demakov <adema...@gmail.com> writes: >> On Fri, Jun 17, 2016 at 10:54 PM, Robert Haas <robertmh...@gmail.com> wrote: >>> In my opinion, that's not going to fly. If I thought other

Re: [HACKERS] Experimental dynamic memory allocation of postgresql shared memory

On Sat, Jun 18, 2016 at 12:31 AM, Andres Freund <and...@anarazel.de> wrote: > On 2016-06-18 00:23:14 +0600, Aleksey Demakov wrote: >> Finally, it's possible to repeatedly mmap >> and munmap on portions of a contiguous address space providing >> a given addr argument

Re: [HACKERS] Experimental dynamic memory allocation of postgresql shared memory

Sorry for unclear language. Late Friday evening in my place is to blame. On Sat, Jun 18, 2016 at 12:23 AM, Aleksey Demakov <adema...@gmail.com> wrote: > On Fri, Jun 17, 2016 at 10:54 PM, Robert Haas <robertmh...@gmail.com> wrote: >> On Fri, Jun 17, 2016 at 12:34 PM, A

Re: [HACKERS] Experimental dynamic memory allocation of postgresql shared memory

On Fri, Jun 17, 2016 at 10:54 PM, Robert Haas <robertmh...@gmail.com> wrote: > On Fri, Jun 17, 2016 at 12:34 PM, Aleksey Demakov <adema...@gmail.com> wrote: >>> I expect that to be useful for parallel query and anything else where >>> processes need to share var

Re: [HACKERS] Experimental dynamic memory allocation of postgresql shared memory

On Fri, Jun 17, 2016 at 10:18 PM, Robert Haas wrote: > On Fri, Jun 17, 2016 at 11:30 AM, Tom Lane wrote: > But I'm a bit confused about where it gets the bytes it wants to > manage. There's no call to dsm_create() or ShmemAlloc() anywhere in > the

Re: [HACKERS] Experimental dynamic memory allocation of postgresql shared memory

On Fri, Jun 17, 2016 at 9:30 PM, Tom Lane <t...@sss.pgh.pa.us> wrote: > Aleksey Demakov <adema...@gmail.com> writes: >> I have some very experimental code to enable dynamic memory allocation >> of shared memory for postgresql backend processes. > > Um ... what's th

[HACKERS] Experimental dynamic memory allocation of postgresql shared memory

Hi all, I have some very experimental code to enable dynamic memory allocation of shared memory for postgresql backend processes. The source code in the repository is not complete yet. Moreover it is not immediately useful by itself. However it might serve as the basis to implement higher-level

Re: [HACKERS] Using FDW AddForeignUpdateTargets for a hidden pseudo-column

A very quick and dirty hack I did in src/backend/optimizer/plan/initsplan.c (in 9.5.3): --- initsplan.c.orig2016-06-14 19:08:27.0 +0600 +++ initsplan.c 2016-06-14 19:10:55.0 +0600 @@ -185,9 +185,12 @@ if (IsA(node, Var)) {

[HACKERS] Using FDW AddForeignUpdateTargets for a hidden pseudo-column

Hi all, I have a data store where tuples have unique identities that normally are not visible. I also have a FDW to work with this data store. As per the docs to implement updates for this data store I have AddForeignUpdateTargets() function that adds an artificial column to the target list.

Re: [HACKERS] Rationalizing code-sharing among src/bin/ directories

Hi there, > On 23 Mar 2016, at 22:38, Tom Lane wrote: > Anybody want to bikeshed the directory name src/feutils? Maybe fe-utils > would be more readable. And where to put the corresponding header files? > src/include/fe-utils? For me “utils" sounds like something of