Multithreading is based on interleaved processing, while multiprocessing means truely parallel actions. ========== Not 100% correct - depends on hardware implementation. Multithreading means the ability to achieve parallelism within a single app - HyperThreading P4 CPUs (predecessors of DualCore ones) provide hardware support for that (HT CPU have approx two times more transistors than non-HT and much more expensive ) so that to run a thread per CPU as ideal case. Multiprocessing means the ability to run a process or/and a thread of process per CPU as ideal. But anyway, GPUs are much-much-more more parallelism-in-mind than CPUs.
2012/4/8, Sieghard <s_c_...@arcor.de>: > Hallo Martin, > > Du schriebst am Sat, 07 Apr 2012 18:22:11 +0100: > >> I wonder what is the benefit of massive multithreading if we should not > > There's reason to wonder - massive parallelism is a key feature of > biological systems, for instance. > >> use the necessary synchronization operations because they are too >> costly. ;-) > > It's not neccessarily - but that's still a very active research field. > >> Have a look into FPC RTL how many "if multithread then" exist before >> calling an interlocked operation. > > They shouldn't _check_, but _presume_ multithreading - which is still a far > cry from multi_processing_. > Multithreading is based on interleaved processing, while multiprocessing > means truely parallel actions. With the former, you can be sure that > reading or storing a register-sized variable will never be disturbed. > That's no longer the case with multiprocessing, as several such operation > can occur at the same time. > Now to the interlocking - that's neccessary simply because our machines > have to few resources. The processors have to share many things, most > notably the memory. If they hadn't to share, there would be much less > synchronisation needs, and parallelism would live up a lot. > But, as mmentioned above, that's still a very active research field. > > -- > (Weitergabe von Adressdaten, Telefonnummern u.ä. ohne Zustimmung > nicht gestattet, ebenso Zusendung von Werbung oder ähnlichem) > ----------------------------------------------------------- > Mit freundlichen Grüßen, S. Schicktanz > ----------------------------------------------------------- > > > ------------------------------------------------------------------------------ > For Developers, A Lot Can Happen In A Second. > Boundary is the first to Know...and Tell You. > Monitor Your Applications in Ultra-Fine Resolution. Try it FREE! > http://p.sf.net/sfu/Boundary-d2dvs2 > _______________________________________________ > mseide-msegui-talk mailing list > mseide-msegui-talk@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/mseide-msegui-talk > ------------------------------------------------------------------------------ For Developers, A Lot Can Happen In A Second. Boundary is the first to Know...and Tell You. Monitor Your Applications in Ultra-Fine Resolution. Try it FREE! http://p.sf.net/sfu/Boundary-d2dvs2 _______________________________________________ mseide-msegui-talk mailing list mseide-msegui-talk@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mseide-msegui-talk
