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Of course, I have a practical purpose for running seven OSes on my Mac. . . providing service to my clients. I seldom run them simultaneously, but i have. I have been challenged on my assertion before, but this graphically demonstrates that challenge was just wrong. It is entirely possible and reasonable to do on a Mac. I know of developers who do it regularly.
One of the best commercials ever...except 99.9% of the population wouldn’t understand a word of it. Thanks for posting.
But is it possible to run OS 9 anymore in an OS X window? Or is that kaput?
What else are these things used for?
I wonder how much memory that guy has in his demo machine.
Define “running” in this case. 25 VMs “running” at idle is nothing. The Vt-D in any platform could handle 25/50 threads without breaking a sweat. How about RAM allocation per VM? Number of cores per VM? What integration technologies are configured (e.g. clock synchronization, clipboard redirection)?
VMware’s guidance for most VM hosts running ESX 5.5 is 25-30 guests per host depending on load. High IO with products such as databases or graphical applications cut those numbers in half. In most cases, we’re talking about hosts with over 64 GB RAM and usually two or more quad-core or better processors.
We run Cisco UCS hardware in our shop, and our hosts have four hex-core processors, 192 GB RAM, and at least four FC backchannels for storage to EMC hardware. We run an average of 30 guests per host. If every one of those guests ramped up to 50% or better on CPU, every channel on that system would be swamped. You’d see CPU cache latency in the 3-5 second range, which is an eternity in computing.
I have a lot of respect for Apple and their hardware, but to make it seem like running 25 VMs on a consumer-grade platform is impressive, they’re being disingenuous unless you give us more than just a number.
I have over 50 VMs configured in my home lab which runs on three different Intel-based platforms, but they’re not all turned on at the same time.
BFD , seriously... how lousy does PC software have to be that this is news ... I had a IBM 4341 running CMS VM 35 years ago with 7 production systems on it and it had 1mb of memory and sub 1 second response times...and in 1991 NASA consolidated a dozen legacy 1950’s/60’s/70’s/80’s computer systems that couldn’t previously communicate (all kinds of has-been vendors that were LONG out of business) onto a single 3090-200 running VM in the VAB located datacenter.
Just getting 25 OS’s loaded and being able to switch between them is NOT impressive. Try putting 500-1000 users on each image, or even just 50 since it’s a pc. Notify me when pc coders get to that level of tightness in their code.

Would like to know the HDD configuration on the Mac he used. No way he launched 25 different VM's on the same physical disk and had that type of response time on the VM's he was launching.
Also, it appeared the foreground VM had very good response time, what about the VM's that were in the background? Were they responsive? Didn't see if they were or not.
The machine I'm on right now is an AMD FX-8350 with 8 Cores, overclocked to 4.8Ghz, 32GB of Memory and 5 Samsung EVO 850 Pro SSD's in a raid config. I've never pushed to see how many VM's I can run on this machine. I typically don't have much need beyond 4 VM's (Windows 8.1, Windows XP, Ubuntu and Mint.)
I configure my VM's to have 2 Cores each and 6-8Gb of memory each. Wonder how the guy in this video configured CPU and Memory for his VM's. Would really like to see that.
Got a question for you - I’m due for an upgrade - and thinking if money were no object, getting a trashcan. I’ve built all my own boxes for 25 years - so buying a Mac Pro is a big decision.
Colleague at work bought the $4k one - he does video editing and iPhone development on the side - besides our day jobs of Java/.NET. He said I should go the Hackintosh route. I looked into it - for $800 I can get an Intel 5830 hex-core - solid mboard - and do the Bootcamp or Parallels thing - or even Fusion.
Your thoughts on Hackintosh?
VMWare has been running on Intel servers for a very long time and 25 client is not all that impressive. Nice to see Apple finally catching up.
All it takes is lots of ram.
These days with modern CPUs, it's not really even a horsepower issue.