Author: Robert Hyatt
Date: 08:36:30 03/05/03
Go up one level in this thread
On March 05, 2003 at 02:05:30, Aaron Gordon wrote: >On March 04, 2003 at 21:57:58, Nolan Denson wrote: > >>There are no draw backs when looking to get a computer that using >>Hyper-Threading. If you do not like the feature you can just simply turn it off. >>There are many system on the market that claims to be Hyper Threading enabled. >>Intel has a utility program that checks for Hyper Threading ... >> >>1. You must have the proper CPU's. >>2. You must have the proper motherboard. >>3. You bios must support it. >>4. Your Operating system must support it. >> >>Once these things are met your system will indicate that Hyper Threading is >>enable before booting into the Operating System. >> >>It is not an indication that you will see when the computer is turned on and the >>Bios is posting. >> >>Soon all of Intel processcor's will have Hyper Threading. So if what you are >>using your processor slows down with Hyper Threading, just simply turn it off >>via the Bios. > >How convenient. Have to reboot 20 times per day to turn it on/off just so your >applications run optimally. I'll be sticking with the cooler running, faster, >and cheaper AMD chips. :) You don't have to do this. Just use an SMT aware operating system and just run two tasks, although I think there is _zero_ chance that a parallel algorithm that works with two threads on a dual processor will behave _worse_ using two threads on a single SMT cpu than it does using just one thread. SMT is not going to _worsen_ performance, particularly if spinlocks and spinwaits are used correctly. Since most programs don't even use 'em, it isn't an issue at all. > >>On March 04, 2003 at 17:39:42, Vincent Diepeveen wrote: >> >>>On March 04, 2003 at 16:32:33, Jay-R Delacruz wrote: >>> >>>>Do the deep versions of Fritz, Junior and Shredder support hyper-thread? Can >>>>someone please tell me before upgrading my PC to try the deep versions? >>> >>>I just read email from Frans Morsch. DeepFritz7 gets 5-10% speedup by >>>hyperthreading. >>> >>>Shredder gets more speedup in nodes a second than that, but it gets no speedup >>>from it as it gets SMP already a far smaller speedup (1.5 or so), so it is >>>smarter to turn SMT/HT off for it. perhaps shredder8 will fix this. >>> >>>For diep it speeds me up about 11% in NPS but i cannot garantuee that at a 4 >>>processor it will give a positive speedup. >>> >>>When running 2 processes at a P4 at 3.06ghz it will give for sure some speedup >>>because it goes from 100k nps to 120k nps. Nearly 20% speedup it gets with it >>>(18.6 or something) which gives a positive speedup also in depth. >>> >>>For deepjunior we know that it already works bad at 8 processor Xeon 1.6Ghz >>>versus 4 processor Xeon 1.9Ghz, so i *assume* for now that SMT/HT will not give >>>it much benefit for it at all, but perhaps Amir or Shay wants to give a >>>statement regarding this themselves. >>> >>>We talk of course about the SMT/HT from Xeon processors up to 2.8Ghz now for >>>those which have it enabled. For the P4 3.06Ghz and also Xeons of that and above >>>things are a different matter. >>> >>>Best regards, >>>Vincent
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