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hyper threading vs cores??

post #1 of 7
3/28/10 at 6:12am
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What is the difference between the two? - and do cores matter more than hyper threaded cores?

Thanks
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Choadasaurus-Rex
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post #2 of 7
3/28/10 at 6:19am
I'm thinking , yes. Because HT creates virtual cores that isn't there really (well duh plug , that's what virtual means) but real cores are real cores. They warm up , they render , they're hard to cool. And since HT makes virtual cores run on real cores. They run hotter because of it. So yeah , cores are more important than HT.
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post #3 of 7
3/28/10 at 6:22am
Hyperthreading basically makes a virtual core for every actual core you have.
So you want cores with HT enabled to double your processing power.

4 core w/HT = 8 cores
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post #4 of 7
3/28/10 at 6:26am
oh i thought hyper threading worked like this:

if u have 4 cores, and your program only is able to utilize one core, it creates one hyper Virtual core, so in effect, the program is using 4 cores but thinks its only 1!
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post #5 of 7
3/28/10 at 7:20am
Quote:
Originally Posted by [xPt]FLuX View Post
oh i thought hyper threading worked like this:

if u have 4 cores, and your program only is able to utilize one core, it creates one hyper Virtual core, so in effect, the program is using 4 cores but thinks its only 1!
Nope, it works pretty much the opposite of that. You have a program that wants to use 4 cores (or 2, 8, 12, whatever), but you only have 2 (or 1, 4, 6, etc). Hyperthreading splits your 2 real cores into 2 real and 2 virtual cores, so the program can run four threads. If you have 4 real cores you get 8 hyperthread, 6 real cores is 12 hyperthreaded, etc.

Real cores are better than virtual cores because, even though hyperthreading allows the real cores to run more efficiently, it's still no substitute for a an actual core. Compare the gflops of a hyperthreaded dual core and a non-hyperthreaded quad core and you'll see that the quad has a large processing advantange.
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post #6 of 7
3/28/10 at 7:26am
Quote:
Cores are physical hardware blocks in the processor that can run applications serially. Threads, on the other hand, aren’t physical – they are software-generated tasks that can execute independently. A well threaded program will run itself across multiple cores.
http://www.taranfx.com/hyper-threading-cpu

Quote:
Originally Posted by AMD
So – cores are like bikes, threads are the riders. Running more threads increases throughput for applications as long as you have available cores. If you have threads waiting to be scheduled and no available cores – you have a bottleneck.
http://blogs.amd.com/work/2010/01/21...out-the-cores/
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post #7 of 7
10/15/11 at 12:14pm
Quote:
Originally Posted by AyeYo View Post
Nope, it works pretty much the opposite of that. You have a program that wants to use 4 cores (or 2, 8, 12, whatever), but you only have 2 (or 1, 4, 6, etc). Hyperthreading splits your 2 real cores into 2 real and 2 virtual cores, so the program can run four threads. If you have 4 real cores you get 8 hyperthread, 6 real cores is 12 hyperthreaded, etc.

Real cores are better than virtual cores because, even though hyperthreading allows the real cores to run more efficiently, it's still no substitute for a an actual core. Compare the gflops of a hyperthreaded dual core and a non-hyperthreaded quad core and you'll see that the quad has a large processing advantange.
Okay, I understand that, but what if you are comparing 4 cores w/hyperthreading and 4 cores w/o hyperthreading? Would the 4 with hyperthreading be the advantage?
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