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Why does turning HT on decrease my gflops so significantly ?

post #1 of 6
Thread Starter 
I am getting 131 gflops in linX with ht off.

With HT on it is only pulling 75gflops?

why is that, and does that mean my computer will have better power in terms of computing if HT is turned off.... I thought it was suppose to increase performance by 25-30% not decrease it

Could someone enlighten me?
Galbus
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Galbus
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post #2 of 6
Have no idea why, maybe because glops doesn't utilize all threads properly, not too sure why, but that is what I think makes the most sense. Also, by having HT off, you can pull off 7-10c off your chip, which is pretty neat.
post #3 of 6
Overhead to run the extra threads.
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post #4 of 6
Thread Starter 
Quote:
Originally Posted by justarealguy View Post
Overhead to run the extra threads.
sorry wut?
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Galbus
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post #5 of 6
Because you don't have 8 cores you only have 4.

When you run highly optimized code and try to send more threads down the same cores it ends up bottlenecking itself. The result is lower flops.

HT is a crutch for poorly coded software. Any code that is truly optimized will use all the clock cycles, which when used with HT causes a performance LOSS.
    
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post #6 of 6
Quote:
Originally Posted by badatgames18 View Post
sorry wut?
Read up on what hyperthreading actually does. There are a number of resources that are shared between the threads, these need to be managed and if the threads are competing for said resources then you'll end up in a performance loss.

http://www.agner.org/optimize/blog/read.php?i=6 have a read.
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