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Odd, Nero vision slower with Multithreading.

post #1 of 4
Thread Starter 
I have Nero 10.
I am not sure what version of Nero Vision i am using, but it came with Nero 10.

I turned off multithreading in bios while playing my video game. I forgot to turn it back on and went to make a dvd. The information needed encoded and was stored on a second HDD.I set the priority to "Above Normal".

Nero Vision stated that it would take 10-11 min. I went ahead and made the dvd, but forgot to make a copy.

At this point i rebooted my pc, enabled multithreading and started making the dvd again. Nero Vision took 16-17 min. (I set the priority to "Above Normal").

Has anyone else ran into this where encoding was faster with multithreading off?
post #2 of 4
Here's an explanation:

If Nero uses only four threads, and puts those in logical CPUs 0-3, then that would correspond to cores 0 and 1 with hyperthreading enabled, and cores 0 through 3 with hyperthreading disabled, thereby actually improving the speed by disabling hyperthreading. Some applications don't do a very good job of differentiating between "fake" hyperthreading CPUs and real cores, and they can sometimes inefficiently use cores because they think there are more of them then there really are.
post #3 of 4
Thread Starter 
Quote:
Originally Posted by Nick2253 View Post
Here's an explanation:

If Nero uses only four threads, and puts those in logical CPUs 0-3, then that would correspond to cores 0 and 1 with hyperthreading enabled, and cores 0 through 3 with hyperthreading disabled, thereby actually improving the speed by disabling hyperthreading. Some applications don't do a very good job of differentiating between "fake" hyperthreading CPUs and real cores, and they can sometimes inefficiently use cores because they think there are more of them then there really are.
What you say makes sense.

I was just very surprised to find this happening with the latest version of Nero.

I also meant to say hyperthreading, but am not feeling well and so must have been confused and said multi.

Nero will use all 8 cores, but at a lower percentage than with 4 cores.
Nero never uses anything close to 100%
post #4 of 4
Quote:
Originally Posted by micro5797 View Post
What you say makes sense.

I was just very surprised to find this happening with the latest version of Nero.

I also meant to say hyperthreading, but am not feeling well and so must have been confused and said multi.

Nero will use all 8 cores, but at a lower percentage than with 4 cores.
Nero never uses anything close to 100%
I think it's interesting that Nero does that. If it uses all 8, then it should be faster. But it probably isn't very well optimized to handle purely logical hyperthreading cores.
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