CPU two cores or one core
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From: DevilsPGD on 20 Jan 2010 16:48 In message <hj7ph8$uce$1(a)news.eternal-september.org> TVeblen <Killtherobots(a)hal.net> was claimed to have wrote: >On 1/20/2010 2:34 PM, DevilsPGD wrote: >> In message<hj6q8j$mk2$1(a)news.eternal-september.org> TVeblen >> <Killtherobots(a)hal.net> was claimed to have wrote: >> >>> On 1/19/2010 5:36 PM, shegeek72 wrote: >>>> On Jan 19, 7:50 am, "Ian D"<tau...(a)nowhereatall.com> wrote: >>>> > P4s only have single cores. Pentium Ds are dual core. Starting >>>> with >>>>> the Prescott series, P4s have hyperthreading, (HT). There is one >>>>> physical core and a virtual core. This appears as 2 CPUs in Task >>>>> Manager. For an OS and apps that can utilize HT, this allows for >>>>> more efficient thread scheduling as there are 2 processing paths, >>>>> although the individual threads are still processed sequentially. >>>>> In a true multicore CPU the threads can be processed simultaneously. >>>> >>>> What's interesting is Intel brought back hyperthreading in its i7 >>>> series. If you have a CPU monitor that can display multiple cores >>>> you'll see 8 cores! >>>> >>> In Windows 7 there is an advanced boot feature that allows you to tell >>> the OS how many "processors" it can work with to speed boot time. So for >>> an i7-920 machine should this setting be 4 or 8? >> >> Unless you have specific needs, you're probably best off leaving it >> alone. >> >> Defaulting to all processors logical processors is generally the way to >> go, and this is the default. > >The default setting is one processor. Regardless, it doesn't make any >noticeable difference either way. No, it doesn't default to one processor. It defaults to "undefined", which tells the OS to use all available processors. http://www.edbott.com/weblog/?p=2476 Limiting to one causes a measurable (although insignificant) slowdown.
From: TVeblen on 20 Jan 2010 17:05 On 1/20/2010 4:48 PM, DevilsPGD wrote: > In message<hj7ph8$uce$1(a)news.eternal-september.org> TVeblen > <Killtherobots(a)hal.net> was claimed to have wrote: > >> On 1/20/2010 2:34 PM, DevilsPGD wrote: >>> In message<hj6q8j$mk2$1(a)news.eternal-september.org> TVeblen >>> <Killtherobots(a)hal.net> was claimed to have wrote: >>> >>>> On 1/19/2010 5:36 PM, shegeek72 wrote: >>>>> On Jan 19, 7:50 am, "Ian D"<tau...(a)nowhereatall.com> wrote: >>>>> > P4s only have single cores. Pentium Ds are dual core. Starting >>>>> with >>>>>> the Prescott series, P4s have hyperthreading, (HT). There is one >>>>>> physical core and a virtual core. This appears as 2 CPUs in Task >>>>>> Manager. For an OS and apps that can utilize HT, this allows for >>>>>> more efficient thread scheduling as there are 2 processing paths, >>>>>> although the individual threads are still processed sequentially. >>>>>> In a true multicore CPU the threads can be processed simultaneously. >>>>> >>>>> What's interesting is Intel brought back hyperthreading in its i7 >>>>> series. If you have a CPU monitor that can display multiple cores >>>>> you'll see 8 cores! >>>>> >>>> In Windows 7 there is an advanced boot feature that allows you to tell >>>> the OS how many "processors" it can work with to speed boot time. So for >>>> an i7-920 machine should this setting be 4 or 8? >>> >>> Unless you have specific needs, you're probably best off leaving it >>> alone. >>> >>> Defaulting to all processors logical processors is generally the way to >>> go, and this is the default. >> >> The default setting is one processor. Regardless, it doesn't make any >> noticeable difference either way. > > No, it doesn't default to one processor. It defaults to "undefined", > which tells the OS to use all available processors. > > http://www.edbott.com/weblog/?p=2476 > > Limiting to one causes a measurable (although insignificant) slowdown. Thanks for that info. I unchecked "Number of Processors". So now it will use all available processors. If you check the box the only options are 1 through 8. That's not obvious, which is why it's an advanced setting!
From: DevilsPGD on 20 Jan 2010 22:02 In message <hj7umv$t9b$1(a)news.eternal-september.org> TVeblen <Killtherobots(a)hal.net> was claimed to have wrote: >Thanks for that info. I unchecked "Number of Processors". So now it will >use all available processors. >If you check the box the only options are 1 through 8. It will show you all options appropriate for the number of logical processors. On a Q6600 you'll see 1 through 4, since anything over 4 wouldn't be appropriate. >That's not obvious, which is why it's an advanced setting! It's an advanced setting because using less than the total number of logical processors on your system is an extremely rare configuration.
From: TVeblen on 21 Jan 2010 16:02 On 1/20/2010 10:02 PM, DevilsPGD wrote: > In message<hj7umv$t9b$1(a)news.eternal-september.org> TVeblen > <Killtherobots(a)hal.net> was claimed to have wrote: > >> Thanks for that info. I unchecked "Number of Processors". So now it will >> use all available processors. >> If you check the box the only options are 1 through 8. > > It will show you all options appropriate for the number of logical > processors. On a Q6600 you'll see 1 through 4, since anything over 4 > wouldn't be appropriate. > >> That's not obvious, which is why it's an advanced setting! > > It's an advanced setting because using less than the total number of > logical processors on your system is an extremely rare configuration. I wonder what possible reason someone would have for doing so?
From: DevilsPGD on 21 Jan 2010 17:01
In message <hjafce$u21$1(a)news.eternal-september.org> TVeblen <Killtherobots(a)hal.net> was claimed to have wrote: >On 1/20/2010 10:02 PM, DevilsPGD wrote: >> In message<hj7umv$t9b$1(a)news.eternal-september.org> TVeblen >> <Killtherobots(a)hal.net> was claimed to have wrote: >> >>> Thanks for that info. I unchecked "Number of Processors". So now it will >>> use all available processors. >>> If you check the box the only options are 1 through 8. >> >> It will show you all options appropriate for the number of logical >> processors. On a Q6600 you'll see 1 through 4, since anything over 4 >> wouldn't be appropriate. >> >>> That's not obvious, which is why it's an advanced setting! >> >> It's an advanced setting because using less than the total number of >> logical processors on your system is an extremely rare configuration. > >I wonder what possible reason someone would have for doing so? Usually troubleshooting or diagnostics of some sort. |