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Re: Parallel Scaling of a pgplsql problem

From: Merlin Moncure <mmoncure(at)gmail(dot)com>
To: Venki Ramachandran <venki_ramachandran(at)yahoo(dot)com>
Cc: "pgsql-performance(at)postgresql(dot)org" <pgsql-performance(at)postgresql(dot)org>
Subject: Re: Parallel Scaling of a pgplsql problem
Date: 2012-04-25 22:05:43
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Lists: pgsql-performance
On Wed, Apr 25, 2012 at 1:52 PM, Venki Ramachandran
<venki_ramachandran(at)yahoo(dot)com> wrote:
> Hi all:
> Can someone please guide me as to how to solve this problem? If this is the
> wrong forum, please let me know which one to post this one in. I am new to
> Postgres (about 3 months into it)
> I have PostGres 9.0 database in a AWS server (x-large) and a pgplsql program
> that does some computation. It takes in a date range and for one pair of
> personnel (two employees in a company) it calculates some values over the
> time period. It takes about 40ms (milli seconds) to complete and give me the
> answer. All good so far.
> Now I have to run the same pgplsql on all possible combinations of employees
> and with 542 employees that is about say 300,000 unique pairs.
> So (300000 * 40)/(1000 * 60 * 60) = 3.33 hours and I have to rank them and
> show it on a screen. No user wants to wait for 3 hours,  they can probably
> wait for 10 minutes (even that is too much for a UI application). How do I
> solve this scaling problem? Can I have multiple parellel sessions and each
> session have multiple/processes that do a pair each at 40 ms and then
> collate the results. Does PostGres or pgplsql have any parallel computing
> capability.

what's the final output of the computation -- are you inserting to a
table? if so, it should be trivially threaded any number of ways. it's
pretty easy to do it via bash script for example (i can give you some
code to do that if you want).


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