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Windows Forum / Virtual PC / May 2008More virtual memory....
Is there any way of assigning more memory to the guest than the physical memory of the host?... maybe some trick ussing vitual memory... I need to simulate VM with 1.4Gb minimum... (software requierement) but I have only 1gb in the host... The software actually need to run Vista on the guest VM but it will no use the memory, just need that the system report at least 1.4gb minimun... -- Mike >Is there any way of assigning more memory to the guest than the physical >memory of the host?... maybe some trick ussing vitual memory... No, that's called memory overcommit and Virtual PC doesn't do that. >I need to >simulate VM with 1.4Gb minimum... (software requierement) but I have only >1gb in the host... The software actually need to run Vista on the guest VM >but it will no use the memory, just need that the system report at least >1.4gb minimun... VMWare Workstation can do this, but I suspect it would be so painfully slow with that large an overcommit. I'd really suggest testing this on a machine with the right amount of RAM.  SignatureBob Comer >Is there any way of assigning more memory to the guest than the physical >memory of the host?... maybe some trick ussing vitual memory... I need to >simulate VM with 1.4Gb minimum... (software requierement) but I have only >1gb in the host... The software actually need to run Vista on the guest VM >but it will no use the memory, just need that the system report at least >1.4gb minimun... Thanks for your answer ;) In the "pleistocene" of computers.... I recall some tools to "expand" memory... that's simulate 16Mb on a 8Mb superslow 386... running Win 3.1. "Softram" or something like this I guess.... I don't remember if that utility uses virtual memory or ram compression... I have no idea.... (and don¡t know if that was memory overcommit also...) Do you know about something similar at the XP or Vista world? It's probably just a mental sadism but... you know.... just in case.... Anyway...with memory prices falling I will buy an extra 1gb ram to go ahead with my tests... (but in a couples of weeks..) thanks... Robert Comer <bobcomer-removeme-@mindspring.com> escribió en el mensaje de noticias 64o1s3pd9mo68s7cqmfoouc5ndfoobfe18@4ax.com... > >Is there any way of assigning more memory to the guest than the physical > >memory of the host?... maybe some trick ussing vitual memory... [quoted text clipped - 22 lines] > >but it will no use the memory, just need that the system report at least > >1.4gb minimun... >Do you know about >something similar at the XP or Vista world? Vista and XP already have such a system in place, as have any Windows OS after 3.1, but it's not real RAM, it's a system for swapping out pages of RAM to disk that are not needed at the moment so you can load in pages of RAM that are. It would be really hard for the host OS to know what pages in the VM that would not be needed, so something on top of the host OS in VPC would have to take care of that, adding yet another layer of virtual memory. So it would be 3 layers, the host, VPC the app, and then the OS inside the VM and they pretty much fight each other for resources. VPC doesn't allow any of it's allocated RAM to be swapped out to disk though, and it has to allocate real RAM when it starts up, and I believe the reasons for this is separation of the virtual Machine from anything the host OS might do with its RAM, and for performance reasons. This is all an educated guess on my part, as I really don't know how a memory overcommit would work with something like VPC, so take it with a grain of salt, but I do know overcommit on top of virtual memory, is much, much, slower than having enough RAM to begin with. SignatureBob Comer >Thanks for your answer ;) > [quoted text clipped - 41 lines] >> >but it will no use the memory, just need that the system report at least >> >1.4gb minimun... Thanks Robert Comer <bobcomer-removeme-@mindspring.com> escribió en el mensaje de noticias acq2s3he4mu7se33fjcpfehrh097tl00f5@4ax.com... > >Do you know about > >something similar at the XP or Vista world? [quoted text clipped - 68 lines] > >> >but it will no use the memory, just need that the system report at least > >> >1.4gb minimun... No problem. SignatureBob Comer >Thanks > [quoted text clipped - 83 lines] >least >> >> >1.4gb minimun... > Is there any way of assigning more memory to the guest than the physical > memory of the host?... maybe some trick ussing vitual memory... I need to [quoted text clipped - 5 lines] > -- > Mike XC7WOw sd9fj41dkg0ckahr82y4 No, not with VPC. I think VMWare used to provide a way but I don't recall if the newer versions still do. >> Is there any way of assigning more memory to the guest than the physical >> memory of the host?... maybe some trick ussing vitual memory... I need [quoted text clipped - 12 lines] > Posted via http://www.VirtualServerFaq.com - Brought to you by Business > Information Technology Shop - http://www.bitshop.com > Is there any way of assigning more memory to the guest than the physical > memory of the host?... maybe some trick ussing vitual memory... I need to [quoted text clipped - 5 lines] > -- > Mike XC7WOw sd9fj41dkg0ckahr82y4 |
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