On Tue, Jan 20, 2015 at 9:43 PM, Thom Brown <thom@linux.com> wrote: > > On 20 January 2015 at 14:29, Amit Kapila <amit.kapila16@gmail.com> wrote: >> >> On Thu, Jan 15, 2015 at 6:57 PM, Amit Kapila <amit.kapila16@gmail.com> wrote: >> > On Mon, Jan 12, 2015 at 3:25 AM, Robert Haas <robertmhaas@gmail.com> wrote: >> > > >> > > Yeah, you need two separate global variables pointing to shm_mq >> > > objects, one of which gets used by pqmq.c for errors and the other of >> > > which gets used by printtup.c for tuples. >> > > >> > >> > Okay, I will try to change the way as suggested without doing >> > switching, but this way we need to do it separately for 'T', 'D', and >> > 'C' messages. >> > >> >> I have taken care of integrating the parallel sequence scan with the >> latest patch posted (parallel-mode-v1.patch) by Robert at below >> location: >> http://www.postgresql.org/message-id/CA+TgmoZdUK4K3XHBxc9vM-82khourEZdvQWTfgLhWsd2R2aAGQ@mail.gmail.com >> >> Changes in this version >> ----------------------------------------------- >> 1. As mentioned previously, I have exposed one parameter >> ParallelWorkerNumber as used in parallel-mode patch. >> 2. Enabled tuple queue to be used for passing tuples from >> worker backend to master backend along with error queue >> as per suggestion by Robert in the mail above. >> 3. Involved master backend to scan the heap directly when >> tuples are not available in any shared memory tuple queue. >> 4. Introduced 3 new parameters (cpu_tuple_comm_cost, >> parallel_setup_cost, parallel_startup_cost) for deciding the cost >> of parallel plan. Currently, I have kept the default values for >> parallel_setup_cost and parallel_startup_cost as 0.0, as those >> require some experiments. >> 5. Fixed some issues (related to memory increase as reported >> upthread by Thom Brown and general feature issues found during >> test) >> >> Note - I have yet to handle the new node types introduced at some >> of the places and need to verify prepared queries and some other >> things, however I think it will be good if I can get some feedback >> at current stage. > > > Which commit is this based against? I'm getting errors with the latest master: >
It seems to me that you have not applied parallel-mode patch
before applying this patch, can you try once again by first applying