-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Andy Smith wrote: > On Sat, Jun 10, 2006 at 10:14:41PM -0500, Ron Johnson wrote: >> Nate Bargmann wrote: [snip] > This is a bit simplistic. Hyper-Threading (or more correctly, > simultaneous multithreading (SMT)) is almost always a win because > at any given time a CPU is often waiting for other stages of the > pipeline to complete before it can progress with what it is > being tasked to do. By having multiple threads of execution it > can be getting on with something useful more of the time. > > Of course, unless the software being run is paralellizable then > very little gains will be realised, but the execution part should > never actually get slower. There have been bugs in the Pentium > 4 architecture that have caused various software to run slower > under hyperthreading, and lack of paralellism can lead to no > discernible benefit, but the concept of SMT when done right has > no downside from the point of view of a CPU executing > instructions.
Thanks for correcting me regarding the mechanics of it. I stand by my assertion, though, that Intel's HT slows down apps unless they are very threaded. - -- Ron Johnson, Jr. Jefferson LA USA Is "common sense" really valid? For example, it is "common sense" to white-power racists that whites are superior to blacks, and that those with brown skins are mud people. However, that "common sense" is obviously wrong. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.3 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFEjAX3S9HxQb37XmcRAktzAJ9AknkW6OKzsJ1mdBCyLuH/9x5LnwCgjOVo OL3kBvuAFIv62MlqunnrSzU= =xBxl -----END PGP SIGNATURE----- -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
