## Parallel Scaling of a pgplsql problem

From: Venki Ramachandran "pgsql-performance(at)postgresql(dot)org" Parallel Scaling of a pgplsql problem 2012-04-25 18:52:03 1335379923.47084.YahooMailNeo@web184514.mail.ne1.yahoo.com (view raw, whole thread or download thread mbox) 2012-04-25 18:52:03 from Venki Ramachandran  2012-04-25 19:36:25 from Samuel Gendler   2012-04-25 21:12:03 from Venki Ramachandran    2012-04-25 21:26:22 from Pavel Stehule     2012-04-25 21:45:38 from Venki Ramachandran      2012-04-25 21:52:08 from Tom Lane       2012-04-26 02:40:18 from Venki Ramachandran        2012-04-26 06:49:12 from Yeb Havinga  2012-04-25 20:04:45 from "Kevin Grittner"  2012-04-25 20:09:26 from Pavel Stehule  2012-04-25 22:05:43 from Merlin Moncure  2012-04-26 03:41:13 from Jan Nielsen  2012-04-26 16:13:36 from Greg Spiegelberg pgsql-performance
```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.

Thanks, Venki```

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