Calling same method with different parameters - How to use multithreading / parallel class?

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.NET3.5

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Here is the scenario: I have a dll which has method that gets data from db, depending on parameters passed, does various checks and gives me required data.
GetGOS_ForBill(AgencyCode)
In a windows application, I have listbox which list 500 + agencies. I retrieve GOS for each agency append to a generic list. If the user has selected all agencies (500 + for now), it takes about 10 min. to return data from the dll.

We though about background processing. But that doesn't reduce the time, other than user get to do other things on the screen. Considering multithreading or parallel class.

Can anybody help me with this? What would be right approach and how can we accomplish this?

Posted 18-Jan-13 5:09am

SandhyaPillai

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BC @ CV 18-Jan-13 11:19am

Keep in mind multi-threading only speeds up processing if you have multiple CPUs.

Devender Pratap 25-Jan-13 2:25am

it's not working properly

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OriginalGriff · Answer 1 · 2013-01-18T05:31:00

Multithreading or parallel may or may not speed things up - it can actually slow things down because of the processing overhead in setting up the thread / tasks and allocating separate memory space for them. In addition it depends what else is going on - if each thread needs to talk to SQL then that will potentially use two cores per thread.

The first thing I would do is look at what you have, and start timing it. (Use the Stopwatch class) Try to find which part of the operation is taking time, it may be that you can make a simple change which cuts it dramatically. For example, if you are doing a trip to your DB for each item going into the list, then you may find it a lot quicker to do a single trip then sort the data out afterwards. At least if you have worked out how long each part takes, you can both target your changes, and quantify them as to whether they are worthwhile solutions or not.

(I had a list which loaded from a database on startup, and it took two and half minutes to load 1000+ items using a background task and a splash screen. By timing what was wasting time, I got it down to 12 seconds for 30,000 items, and dumped the splash)