Software Engineering Stack Exchange is a question and answer site for professionals, academics, and students working within the systems development life cycle. It only takes a minute to sign up.
Sign up to join this community
I am trying to draw diagrams that show the difference between system virtual machines and Java virtual machines.
The first two images looks correct to me. But I don't know how to draw the third.
Image 1:
Image 2:
Image 3:
As you see, both red blocks and gray frames have the same captions: "JVM". I don't think it is correct. I'm sure that caption should be different: "JVM" for gray frames and "something different" for red blocks.
How the third diagram should be fixed?
It's fine as is, if you think about it the right way.
You can think of a Virtual Machine as a task running on the hypervisor. They get context switched nearly the same way after all. Tasks and Apps aren't the same thing. Tasks only exist when they're running. Apps exist even after you've terminated their running tasks. They sit around waiting for you to start them again.
Here's a little example.
The issue is that apps and tasks get the same names so, yeah, it can be confusing. Especially when the other images in your question aren't following that same pattern. A normal host OS knows the name of the apps it's running (and so can give the tasks the same names). However, a hypervisor has no idea the name of the guest OS that's running on it. So it makes up it's own names for it's "tasks": "System VM 1", etc.
