Re: Thread Pool versus Dedicated Threads

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Thu, 14 Aug 2008 17:58:23 GMT
On 2008-08-14 08:20, ????????? wrote:

Hi all,

Recently I had a new coworker. There is some dispute between us.

The last company he worked for has a special networking programming
model. They split the business logic into different modules, and have
a dedicated thread for the each module. Modules exchanged info
through a in-memory message queue.

In my opinion, such a model means very complicated asynchronous
interaction between module. A simple function call between modules
would require a timer to avoid waiting for answer forever.
And if a module was blocked by IO (such as db query), other modules
depends on would have to wait for it.

What do u think about it? Is there any successful projects that could
prove which model is **right**?

In general I think you might be right, but when dealing with networking
there is usually a very layered architecture with one-way communication
between the layers (i.e. a lower layer passing the processed data up to
a higher layer). In that case the message-passing model makes very much
sense since it models the actual workings very well and makes each layer
simple to implement (if there are any packages in the in-queue you
process it and put the result in the out-queue, if there are no packages
in the in-queue you wait 'till there are).

For other kinds of tasks it might be easier to let one thread handle the
work-package in all the steps (and modules). Of course there are other
models and combinations, and which one is the best for a given purpose
is not always clear until you have tried a few.

Erik Wikstr??m

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