Re: st: 50% CPU Performance, Stata or Computer?

[Andrew Shephard <andrew_s@ifs.org.uk>]

This depends on the BIOS you are using. It might be described as 
enable/disable logical processor or something. You should probably check 
your manual as it may describe the BIOS settings. (I would not advice 
you to change settings if you are unsure what you are doing, as I do not 
think there is any problem with your system from what you have described.)

Regards,

Andrew

Nomoreno wrote:


> I tried to disable HT but something weird happens. When I went to the 
> BIOS and saw "CPU Application" is Enabled, I guess it is about HT. 
> However, I was not able to use the arrow key to scroll down to this 
> this field. Any ideas to disable HT?
>
> Thanks!
>
>
>
>
> andrew_s@ifs.org.uk wrote:
>
>
> > You only experience performance increases from HT if the applications 
> > which you are using support them. Therefore, if Stata does not 
> > support HT (which I do not believe it does), then it does not matter 
> > if you have HT enabled or not.
> >
> > Also note that for applications that do support HT, performance 
> > increase will usually be quite modest (an increase of 25% at most I 
> > think).
> >
> >
> > Nomoreno wrote:
> >
> >
> > > I guess you are right because the task manager shows two CPU 
> > > performance windows.
> > >
> > > Quick question: Why do you say that if I disable it in the BIOS, the 
> > > actual performance will be the same? I would think the simulations 
> > > will run twice as much faster as before if I disable it. Am I 
> > > missing anything here?
> > >
> > > Thanks!
> > >
> > >
> > > andrew_s@ifs.org.uk wrote:
> > >
> > >
> > > > I suspect it might be because you have a CPU which supports 
> > > > HyperThreading (HT). If this is the case then there is nothing to 
> > > > worry about. My understanding (correct me if I am wrong), is that 
> > > > HT essentially makes you computer think there are two CPUs (look in 
> > > > your System properties). If you are just seeing 50% usage then it 
> > > > just means that Stata does not support HT and so does not have any 
> > > > performance boost as a result of this.
> > > >
> > > > If you disable HT (which you can typically do in the BIOS) then I 
> > > > would expect that CPU usage would shoot up to 100%. However, the 
> > > > actual performance which you get will be the same.
> > > >
> > > > Nomoreno wrote:
> > > >
> > > >
> > > > > Hello all,
> > > > >
> > > > > I was puzzled by one annoying thing of my computer and I don't 
> > > > > know whether I should fault Stata or my computer.
> > > > >
> > > > > Basically, I am running computational intensive Monte Carlo 
> > > > > simulations on Stata under Windows XP on a brand new Dell 
> > > > > Inspiration laptop. Somehow my Task Manager shows that the 
> > > > > computer is using 50% of its CPU usage on this computer. It is 
> > > > > weird because the same program always use 100% of the CPU on my 
> > > > > old machine.
> > > > >
> > > > > I suspect it is the problem of my computer rather than my Stata, 
> > > > > though I am not 100% sure. Anyone has any ideas to release the 
> > > > > remaining 50% CPU power of my computer? I really appreciate your 
> > > > > help!
> > > > >
> > > > >
> > > > > Best,
> > > > > Simon
> > > > >
> > > > > *
> > > > > *   For searches and help try:
> > > > > *   http://www.stata.com/support/faqs/res/findit.html
> > > > > *   http://www.stata.com/support/statalist/faq
> > > > > *   http://www.ats.ucla.edu/stat/stata/
> > > > *
> > > > *   For searches and help try:
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> > > > *   http://www.stata.com/support/statalist/faq
> > > > *   http://www.ats.ucla.edu/stat/stata/
> > >
> > >
> > >
> > > *
> > > *   For searches and help try:
> > > *   http://www.stata.com/support/faqs/res/findit.html
> > > *   http://www.stata.com/support/statalist/faq
> > > *   http://www.ats.ucla.edu/stat/stata/
> > *
> > *   For searches and help try:
> > *   http://www.stata.com/support/faqs/res/findit.html
> > *   http://www.stata.com/support/statalist/faq
> > *   http://www.ats.ucla.edu/stat/stata/
>
> *
> *   For searches and help try:
> *   http://www.stata.com/support/faqs/res/findit.html
> *   http://www.stata.com/support/statalist/faq
> *   http://www.ats.ucla.edu/stat/stata/
*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/