How to test with low RAM and just one CPU core

[Jose Lopez]

Hi Jonathan, I'm very interested in learning CLI from Grub, never done it
before and I,m pretty new to (advance CLI) as I would look at it. is there
a link or a tut that you can point me to.
Thanks
Jose Lopez


On Fri, May 31, 2013 at 11:36 PM, Jonathan Marsden <jmarsden at fastmail.fm>wrote:

> On 05/31/2013 09:10 PM, Phill Whiteside wrote:
>
> > you can also utilise the abilities built into the linux kernel.
>
> Those kernel parameters *are* "abilities built into the Linux kernel",
> aren't they? :)
>
> > I know at times I seem like a fan boi of virt-manager, but it is a
> > GUI that uses the kvm abilities that are in built to the linux
> > kernel. I'm sure the purists will prefer using virsh exactly, but I
> > do ask why we need to learn so much command line stuff :)
>
> (1) When your machine doesn't boot, knowing enough to play with Grub a
> little is something that suddenly seems well worth knowing :)  Grub is
> command based and text-file-configured, so unless you can point me to a
> 100% GUI-configured boot manager to use instead of Grub, I think that
> means learning a few keystrokes and config items, in order to understand
> and manage how your PC boots.
>
> (2) Creating a test VM and installing a fresh Lubuntu OS into it, then
> booting the VM and testing, and then (if you have limited disk space)
> deleting the VM afterwards, takes *way* more time and effort than
> rebooting a PC with an existing Lubuntu installation on it and typing
>
>   mem=512M nosmp
>
> into one line of boot info and pressing Ctrl-X.
>
> I was responding to someone who said they "couldn't" test a Lubuntu in a
> low RAM low-CPU environment because they had a dual-core CPU and 1GB...
> my point was and remains that they absolutely *can* do such testing on
> that hardware, with minimal time investment and in a way that leaves
> their PC "just like it was before" once they are done testing and reboot
> normally.
>
> Are you *sure* "use KVM to create a VM to test in" is an appropriate
> response to a user with a Pentium D and 1 GB RAM?  I think it's possibly
> more appropriate for users with later CPUs and 4GB or more.
>
> Finally, even *if* the Pentium D the user concerned has supports VT-x
> (which is needed for KVM, and the Smithfield Pentium D CPUs don't have
> it, only the later Presler ones do!),
> https://help.ubuntu.com/community/KVM says that KVM in Ubuntu is
> intended for server, not GUI workstation virtualization, for which
> Virtualbox is better suited... that info may be out of date now, but it
> used to be valid...
>
> Jonathan
>
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