VMware ESX and Parallel Computing

Hello All,

I've been doing some research and wanted to know if there is information or a white paper on VMware's support in+ CPU Parallelism+ on applications.

Any ideas?


Smiley Happy

0 Kudos
2 Replies

Do you mean virtual SMP or cluster HPC?


Andre | http://about.me/amauro | http://vinfrastructure.it/ | @Andrea_Mauro
0 Kudos


CPU Parallelism covers many different things. VMware ESX and for that matter most other hypervisors do the following:

For each VM scheduled Each vCPU within a VM is assigned to a specific Core or Hyperthread within the CPU subsystem of the server. If there are enough Cores or Hyperthreads to run more than one VM at a time then these VMs run in parallel.

VMware Fault Tolerance is an odd bird with respect to CPU Parallelism as its sole intention is to keep a vCPU on one Host in Lockstep with a vCPU on another Host. Which means you have 2 vCPUs for all conceivable purposes acting as one when that vCPU from a VM is scheduled to run on a given Core or Hyperthread.

Within each VM, VMware ESX support Virtual SMP (Symmetric Multi-Processing), which implies that more than 1 vCPU (up to 😎 can be assigned to a given VM, and if the Guest Operating System within the VM can make use of each of the presented vCPUs then it will. There is no difference between this and a physical box. So in this case if the Guest Operating System, Linux, Windows, *BSD, Solaris, etc. supports Parallelism then your Application can take advantage of it.

Can a VM or VMs participate in a High Performance Computing cluster? Yes and perhaps No as there are many more things to consider here than parallelism.

Best regards,

Edward L. Haletky VMware Communities User Moderator, VMware vExpert 2009, Virtualization Practice Analyst[/url]
Now Available: 'VMware vSphere(TM) and Virtual Infrastructure Security: Securing the Virtual Environment'[/url]
Also available 'VMWare ESX Server in the Enterprise'[/url]
[url=http://www.astroarch.com/wiki/index.php/Blog_Roll]SearchVMware Pro[/url]|Blue Gears[/url]|Top Virtualization Security Links[/url]|Virtualization Security Round Table Podcast[/url]

Edward L. Haletky
vExpert XIV: 2009-2022,
VMTN Community Moderator
vSphere Upgrade Saga: https://www.astroarch.com/blogs
GitHub Repo: https://github.com/Texiwill
0 Kudos