Here's a new twist. I have had some trouble with my current VM. Spoke with tech support, they asked how many cores I had decidated. I said two, and that is two out of eight on a quad core i7 listed in the VM settings menu. They advised me to lower it to one, said that is what they recommend. Doesn't make sense to me.
-----Original Message----- From: macvisionaries@googlegroups.com [mailto:macvisionaries@googlegroups.com] On Behalf Of Scott Granados Sent: Wednesday, December 30, 2015 1:31 PM To: macvisionaries@googlegroups.com Subject: Re: Best configuration for new mac? No, the instruction sets are more optimized on the I7 and I think there is a different number of pipelines. Again, Intel would be the authority here on the two but I know the I7 is a fair bit more processor and it’s definitely not just clock rate. > On Dec 30, 2015, at 1:27 PM, Bill Holton <bill32...@gmail.com> wrote: > > Yes, I do see quad core i5's in the Apple refurb store. Guessing the clock > speed is the only difference? > > > -----Original Message----- > From: macvisionaries@googlegroups.com > [mailto:macvisionaries@googlegroups.com] On Behalf Of Scott Granados > Sent: Wednesday, December 30, 2015 1:15 PM > To: macvisionaries@googlegroups.com > Subject: Re: Best configuration for new mac? > > So the difference between an I5 and I7 is the I7 is a more advanced and > better performing chip. I’m not sure but I don’t think the I5 is available > in quad core configurations, for sure the I5 is in dual core configurations > as I have seen them in Macs frequently. The I7 does in fact have a quad core > configuration so in most cases you’ll have double the cores, the clock rate > is faster in the I7, the clock can be overclocked higher on the I7. > > Intel would be a good place to look to get in-depth info as to the > differences in the i5 and i7 lines. > >> On Dec 30, 2015, at 1:08 PM, Bill Holton <bill32...@gmail.com> wrote: >> >> HI. >> Great explanation. But can you tell me the hardware difference between a >> quad core i5 and a quad core i7? Thanks. >> >> >> -----Original Message----- >> From: macvisionaries@googlegroups.com >> [mailto:macvisionaries@googlegroups.com] On Behalf Of Sabahattin Gucukoglu >> Sent: Wednesday, December 30, 2015 9:27 AM >> To: 'Chris Blouch' via MacVisionaries <macvisionaries@googlegroups.com> >> Subject: Re: Best configuration for new mac? >> >> Hi Andrew, >> >> Let’s start from the beginning. >> >> You can think of processor cores as processors in their own right. Each >> core computes at its clock speed, sharing some resources with the other >> cores but essentially operating independently. Operating systems of today >> try to exploit multicore (and, indeed, multiprocessor) systems, by spreading >> the threads of execution (be they separate independent processes, or >> separate threads of an individual process) across the cores and/or >> processors. Using threads of execution that operate in parallel is of >> course going to produce results faster than merely executing instructions on >> a single core. The days of merely increasing the clock speed are mostly >> behind us now, but it was once the norm that operating systems would not >> really benefit from such parallelism, so that increasing the clock speed was >> really the only way to go faster. >> >> Now, this is all fairly simple, but there is an extra complication. Intel >> processors have a feature called “Hyperthreading”, which tries to make >> better use of the processor chip, by virtualising processor cores. These >> cores are distinct from real processor cores, to operating systems that know >> the difference. In fact, though, they are really sharing a physical core >> with another hyperthread. Hyperthreads can improve performance, but they do >> not run independently; there is contention for the resources on that >> physical core they share. It is when the contention does not exist that the >> CPU can exploit parallelism within that core. You can think of it as a sort >> of “Accelerated computation” for the CPU, in much the way that “Accelerated >> graphics” is what you get when GPU (graphics) hardware assists the rendering >> of graphics. >> >> What does all this mean? Well, it means that you need to plan your CPU >> usage carefully, or not, as your requirements dictate. If you want to >> guarantee a fair balance between host and guest, split up the CPU count. >> For a quad-core system, let Windows have two cores. You’ll get a known-good >> balance no matter how hard the operating systems should work their >> respective processor cores, whether at a standstill or in full flight. On >> the other hand, you might care less for the performance of your VM; then you >> reduce the core count, and hope that your operating system will not mind the >> reduced parallel clock speed. Entirely feasible for Linux, for instance, >> although I wouldn’t enjoy using Windows above Vista like that for long. And >> finally, you can go the other extreme: you can give it all to your VM. I do >> this. It’s much riskier; you had better be sure your OS does not draw more >> than it really requires, and you can hurt yourself if your host is starved >> for long periods. But, again for Linux, which is very good at idling the >> chip when not in use, this is entirely feasible. >> >> And about the number of cores available for each VM being higher than the >> number of physical cores, that’s hyperthreading. VMWare Fusion will do the >> right thing, balancing your choice of cores evenly between hyperthreaded >> cores. So actually, a quad-core system has 8 virtual processors, and a >> balanced system takes 4 virtual cores. A single-core system that could >> benefit from hyperthreading could easily be given 2 virtual cores without >> any ill effect. And, yes, if you set the core count to 8, your VM could >> easily take down the host if it loses control. >> >> So, that’s the story. I hope this explains what’s happening, and answers >> your question. >> >> Cheers, >> Sabahattin >> >> -- >> The following information is important for all members of the Mac >> Visionaries list. >> >> If you have any questions or concerns about the running of this list, or if >> you feel that a member's post is inappropriate, please contact the owners or >> moderators directly rather than posting on the list itself. >> >> Your Mac Visionaries list moderator is Mark Taylor and your owner is Cara >> Quinn - you can reach Cara at caraqu...@caraquinn.com >> >> The archives for this list can be searched at: >> http://www.mail-archive.com/macvisionaries@googlegroups.com/ >> --- >> You received this message because you are subscribed to the Google Groups >> "MacVisionaries" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to macvisionaries+unsubscr...@googlegroups.com. >> To post to this group, send email to macvisionaries@googlegroups.com. >> Visit this group at https://groups.google.com/group/macvisionaries. >> For more options, visit https://groups.google.com/d/optout. >> >> -- >> The following information is important for all members of the Mac >> Visionaries list. >> >> If you have any questions or concerns about the running of this list, or if >> you feel that a member's post is inappropriate, please contact the owners or >> moderators directly rather than posting on the list itself. >> >> Your Mac Visionaries list moderator is Mark Taylor and your owner is Cara >> Quinn - you can reach Cara at caraqu...@caraquinn.com >> >> The archives for this list can be searched at: >> http://www.mail-archive.com/macvisionaries@googlegroups.com/ >> --- >> You received this message because you are subscribed to the Google Groups >> "MacVisionaries" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to macvisionaries+unsubscr...@googlegroups.com. >> To post to this group, send email to macvisionaries@googlegroups.com. >> Visit this group at https://groups.google.com/group/macvisionaries. >> For more options, visit https://groups.google.com/d/optout. > > -- > The following information is important for all members of the Mac Visionaries > list. > > If you have any questions or concerns about the running of this list, or if > you feel that a member's post is inappropriate, please contact the owners or > moderators directly rather than posting on the list itself. > > Your Mac Visionaries list moderator is Mark Taylor and your owner is Cara > Quinn - you can reach Cara at caraqu...@caraquinn.com > > The archives for this list can be searched at: > http://www.mail-archive.com/macvisionaries@googlegroups.com/ > --- > You received this message because you are subscribed to the Google Groups > "MacVisionaries" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to macvisionaries+unsubscr...@googlegroups.com. > To post to this group, send email to macvisionaries@googlegroups.com. > Visit this group at https://groups.google.com/group/macvisionaries. > For more options, visit https://groups.google.com/d/optout. > > -- > The following information is important for all members of the Mac Visionaries > list. > > If you have any questions or concerns about the running of this list, or if > you feel that a member's post is inappropriate, please contact the owners or > moderators directly rather than posting on the list itself. > > Your Mac Visionaries list moderator is Mark Taylor and your owner is Cara > Quinn - you can reach Cara at caraqu...@caraquinn.com > > The archives for this list can be searched at: > http://www.mail-archive.com/macvisionaries@googlegroups.com/ > --- > You received this message because you are subscribed to the Google Groups > "MacVisionaries" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to macvisionaries+unsubscr...@googlegroups.com. > To post to this group, send email to macvisionaries@googlegroups.com. > Visit this group at https://groups.google.com/group/macvisionaries. > For more options, visit https://groups.google.com/d/optout. -- The following information is important for all members of the Mac Visionaries list. 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