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#1
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Quick HyperThreading question
If something is only using one thread, a very CPU intensive thing like
WinRAR, is it only using 1.5 GHz of my 3 GHz CPU? Because when I look in task manager it shows 50% CPU in use and 50% idle! |
#2
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Darkfalz wrote:
If something is only using one thread, a very CPU intensive thing like WinRAR, is it only using 1.5 GHz of my 3 GHz CPU? Because when I look in task manager it shows 50% CPU in use and 50% idle! No, it DOES use the full 3GHz power, just as if you had a non-HT-capable 3GHz CPU in your machine. Hyperthreading just gives an added "boost". compared to a non-HT CPU. Task Manager is confused because one logical processor is showing up as idle, so it thinks "one CPU full power, one CPU nothing to do, that's 50% of what is possible" - but it fails to consider that the 2nd logical CPU is not a real one (e.g. no separate cache) and that the added boost for multi-processor aware software is only about 10-20%, depending on the exact kind of software. In other words: everything OK, no reason to worry. |
#3
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It doesn't work like that. One thread will use up to 100%.
-- DaveW "Darkfalz" wrote in message ... If something is only using one thread, a very CPU intensive thing like WinRAR, is it only using 1.5 GHz of my 3 GHz CPU? Because when I look in task manager it shows 50% CPU in use and 50% idle! |
#4
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Well, yes and no, in a way. Anything that uses only a single thread will not
take full advantage of a HT-capable CPU. However, the two execution threads share resources on the CPU die, so the performance will not double when using both threads. -- Robert Hancock Saskatoon, SK, Canada To email, remove "nospam" from Home Page: http://www.roberthancock.com/ "Darkfalz" wrote in message ... If something is only using one thread, a very CPU intensive thing like WinRAR, is it only using 1.5 GHz of my 3 GHz CPU? Because when I look in task manager it shows 50% CPU in use and 50% idle! |
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