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CPU multi core

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August 19, 2010 10:28:41 AM

Case : run a lot of non-multithread-process
System with 4-6 core CPU is faster than 1-2 core CPU ?

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a b à CPUs
August 19, 2010 10:44:11 AM

Normally the 4 core systems would be faster than the 2 core systems. Now if the applications are single threaded you wont notice much of a difference, but the extra speed of the 4-6 core PC would be due to the other aspects of the CPU, like clock speed, HT, Turbo Boost are some which Intel provide.
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a b à CPUs
August 19, 2010 2:04:15 PM

Well - The question was "Run a lot of non-multithreaded processes".

Absolutely a faster dual will run one or two non-mulththreaded processes faster than a (slower clock speed but otherwise equivalent) Quad will.

But as the user piles more processes on, the Quad will come more and more into it's own. For example: open a 3rd process, and the one of the Dual's cores will have to switch back and forth. Open a 3rd process on a Quad, and your 3 processes may all have their own Core to utilize. Add a 4th process, and the Dual will have to have both cores switching back and forth in order to service 2 apiece. While the Quad will be still be theoretically able to dedicate a full core to each.

..and so forth.

<But Scott... you're oversimplifying again>

<...yeah... so? >


< argue... argue... >

<beer>


<insert perfectly valid point about Userland Processes not being the only thing running, so cores are more or less constantly switching anyways...>


< argue... argue... >

<beer>


<insert hyperthreading conversation here...>

< argue... argue... >

<beer>

< argue... argue... >

<more beer>



Whether that makes a difference in Userland depends on the nature of the processes, how stressful they are, and what form that stress is in. For example: If your single threaded processes are dependent on a lot of Hard Drive I/O, then changing the CPU is going to do f*ck~all for improving performance. You'd be far better off spending the money on faster drives.

<*buuurrrrrp*>
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a b à CPUs
August 19, 2010 2:14:46 PM

mylv72 said:
Case : run a lot of non-multithread-process
System with 4-6 core CPU is faster than 1-2 core CPU ?


In the same time or not?
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a c 203 à CPUs
August 19, 2010 2:20:24 PM

mylv72 said:
Case : run a lot of non-multithread-process
What would be 'a lot'?
Right now my dual core laptop is running 784 threads and it's still running at half speed (Speedstep).
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a b à CPUs
August 19, 2010 6:43:10 PM

So you're multi-tasking?

Like they're saying, it matters what you're doing.

More cores means more calculations at once. However, if your apps don't require many CPU calculations the extra cores will be wasted.
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September 5, 2010 2:07:16 AM

Thank you very much for all answers
specially thank to Scotteq's answer (clearly explained in the details )
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