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[ArsTechnica] Transactional memory going mainstream with Intel Haswell

post #1 of 15
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Quote:
Intel has announced that its Haswell architecture, due to ship some time in 2013, will include hardware support for transactional memory.

Transactional memory is a promising technique designed to make the creation of reliable multithreaded programs easier. It does this by using a transactional model wherein complex operations can be performed concurrently, in isolation from each other, with those operations either completing or being undone as if they'd never been started—a model that developers are already familiar with from database programming.

Source

Definitely waiting until Haswell/Broadwell.
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post #2 of 15
In English, what does that mean?
post #3 of 15
Quote:
Originally Posted by iWantACookie View Post

In English, what does that mean?

More efficient multithreading for any program taking advantage of the new extensions.

Think of a library.

With the lock model, there is no librarian, so to keep order within the library, and to prevent people from fighting over the same book, a gate is installed to let one person in at a time.

With the transactional model the gate is removed and a librarian is added. If 2 people want the same book then the librarian kicks one of them out and alerts him when the book is returned.
Edited by mechtech - 2/8/12 at 6:51pm
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post #4 of 15
Quote:
Originally Posted by mechtech View Post

More efficient multithreading for any program taking advantage of the new extensions.
Think of a library. With the lock model, people go in one at a time to ensure that 2 people don't ever fight over same book. With the transactional model, anyone can enter, but if 2 people want the same book then the librarian kicks one of them out and tells him to wait for the book to be returned.

kookoo.gif
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post #5 of 15
Quote:
Originally Posted by mechtech View Post

More efficient multithreading for any program taking advantage of the new extensions.
Think of a library.
With the lock model, there is no librarian, so to keep order within the library, and to prevent people from fighting over the same book, a gate is installed to let one person in at a time.
With the transactional model the gate is removed and a librarian is added. If 2 people want the same book then the librarian kicks one of them out and alerts him when the book is returned.

Oh wow, tell me where this library is. tongue.gif
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post #6 of 15
Will AMD be getting on this?
    
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post #7 of 15
Quote:
Originally Posted by mechtech View Post

More efficient multithreading for any program taking advantage of the new extensions.
Think of a library. With the lock model, people go in one at a time to ensure that 2 people don't ever fight over same book. With the transactional model, anyone can enter, but if 2 people want the same book then the librarian kicks one of them out and tells him to wait for the book to be returned.

nice librarian
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post #8 of 15
I think i am going to wait for Haswell myself. IVY is good and all but its will not show much gain unless i upgrade to GPU too. We can expect Haswell in a 1 year or 2?
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post #9 of 15
Quote:
Originally Posted by totallynotshooped View Post

Will AMD be getting on this?

Eventually, probably.
    
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post #10 of 15
Multithreaded code development and testing is hard... and gets worse as things become more threaded. Everyone is aware of this but the way forward cannot be higher clocks. Intel therefore is doing everything they can to promote and ease multithreaded development.
Once again...
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Once again...
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