6 Replies Latest reply on Apr 24, 2010 8:15 PM by petesieber

    Problem with applications on i-7, i-5 and i-3 processors

    petesieber

      I have had an ongoing issue with my new dell with i-7 760 processor that I have been trying to resolve for some time.

      It will only run aplications at 12-13% cpu usage

      The same .exe does the same on all i-7, i-5, i-3 processors in laptop and desktops but not on any others (I went to best buy and tested it on all there cpus)

      The .exe has been compiled to be multi threaded. If it is run single threaded it will still be sent to multiple cores and run even worse (only on the i-7).

       

      Yet,  the .exe will use all 8 cores 100% on every Xeon based cpu in my lab and ran 100% on AMD and intel celeron processors.

       

      The result was that this .exe runs at the same speed on a $500 laptop with a dual core as my $1400 laptop with i-7

      I bought this laptop for research with computationally intensive programs and this isnt what I paid for.

       

      Is this resolvable or should I return the laptop and avoid the i-7 platform?

        • 1. Re: Problem with applications on i-7, i-5 and i-3 processors
          JoaoMOS

          Hello Pete

          I'm following with interest your question.

          I have an I7 920 with 6 GB of RAM memory (3x2GB DIMMs) and I never saw more than 50% of memory used. Only with the OS and its processes working, about 2GB of RAM are used. I don’t know yet why, but I give responsibility to the actual software. I work with ADOBE applications, and even with PHOTOSHOP CS4 64 bits I don’t see more memory used. Even with several ADOBE applications working with heavy documents, internet in use, Outlook connected, and so on. And even the processor is only used at 17%. And me too, I should like to understand why. Problem of CPU or problem with Operating System, which in my case is Windows 7.

          For instance with Illustrator CS4 where I have some heavy applications, taking a long time on rendering and shadowing, in my laptop, one Pentium at 3,2 GHz Multithreading with 2 GB of RAM with 6 years, I had best performance than I have now.

          I am looking for the answer to your question and with this post I intend to enforce your doubt.

          • 2. Re: Problem with applications on i-7, i-5 and i-3 processors
            petesieber

            The codes in question are fortran codes compiled using intel's compiler; thought, the same issues are prevalent with Matlab, Feko, etc ( all codes work well on 64 bit systems- except i-x based ones).  The codes work wonderfully on any cpu with any operating system except for the i-X architecture.

            I have tested this on :

            Windows 7, Windows 64 xp, windows xp in single threaded and multi threaded forms

             

            I have tested the windows 7 + i-X combo on:

            Asus, samsung, dell, sony and Hp (all behave poorly)

             

            I have tested the windows 7 + non i-x combo on

            pentium, core 2 and AMD processors (all preformed perfect)

             

            I have run the codes on 4 different Dell Xeon cpus (all less than 1yr old) with Xp64 and windows 7 and they all execute the code using all 8 cores at 100% usage

             

            The only thing that I have left to do is to install linux on my laptop and see the performance

            if it isnt 100% then it is clear it is entirely a intel i-x problem (intentiona or unintentional)

            If the problem is rectified ( ie 100% cpu usage) then it is a windows7 + i-x problem

             

            Hopefully the right person sees this and can help

            • 3. Re: Problem with applications on i-7, i-5 and i-3 processors
              JoaoMOS

              Well, nothing new till the moment. I think that Intel specialists don't normally follow this forums, and I don't see another way to comunicate with them. I myself have posted one question about cache specifications on I7 and didn't yet obtain any technical answer. Lots of time ago.

              • 4. Re: Problem with applications on i-7, i-5 and i-3 processors
                JoaoMOS

                Hello Pete

                Try to go to Futuremark and there to PCMark. You are only allowed to make one checkup or then buy the application. It is fery useful so that you can see trhe performance of the various hardaware components of your computer and compare with similar ones. I bought it. With that application and with task manager oppened in the second monitor I could see my I7 fly until 50, 75 and even to 100 % for several times. Finally, yesterday I had to convert the format of several files of about 1 GB each. I solved to do them all at the same time, but iniciating one by one. And my I7 began with thw eternal 17% and some time after if was above the 75%. I took little more time for all the files (I think about 7) than for only one isolated.

                So, I think taht your problem, like mine is that your software is not develloped for INTEL 64 and IA 32 Architectures. Try to go to INTEL site and read a little bit of the first volume in the developpers center for programmers http://www.intel.com/design/corei7/documentation.htm

                • 5. Re: Problem with applications on i-7, i-5 and i-3 processors
                  petesieber

                  The code was compiled with a Intel compiler on the CPU- if that isnt "made for it" nothing is. The problem isnt software it is Hyperthreading.  Hyper threading cannot be dissabled on my laptop.

                  They shouldn't do this - it neuters any cpu beyond superficial use

                   

                  Message was edited by: petesieber

                  • 6. Re: Problem with applications on i-7, i-5 and i-3 processors
                    petesieber

                    specificaly the problem is that dell is using the

                    "Mobile Intel® PM55 Express Chipset"

                    this doesnt allow the deactivation of hyperthreading