Latest posts by

Josh Simons

Josh Simons

With over 20 years of experience in High Performance Computing, Josh currently leads an effort within VMware's Office of the CTO to bring the full value of virtualization to HPC. Previously, he was a Distinguished Engineer at Sun Microsystems with broad responsibilities for HPC direction and strategy. He joined Sun in 1996 from Thinking Machines Corporation, a pioneering company in the area of Massively Parallel Processors (MPPs), where he held a variety of technical positions. Josh has worked on developer tools for distributed parallel computing, including language and compiler design, scalable parallel debugger design and development, and MPI. He has also worked in the areas of 3D graphics, image processing, and realtime device control. Josh has an undergraduate degree in Engineering from Harvard College and a Masters in Computer Science from Harvard University. He has served as a member of the OpenMP ARB Board of Directors since 2002 and is currently serving as Chairman of the Board.

Performance of RDMA and HPC Applications in VMs using FDR InfiniBand on VMware vSphere

Customers often ask whether InfiniBand (IB) can be used with vSphere. The short answer is, yes. VM Direct Path I/O (passthrough) allows InfiniBand cards to be made directly visible within a virtual machine so the guest operating system can directly access the device. With this approach, no ESX-specific driver is required — just the hardware […]

Virtualized HPC at Johns Hopkins Applied Physics Laboratory

Johns Hopkins University Applied Physics Laboratory (JHUAPL) has deployed a virtualized HPC solution on vSphere to run Monte Carlo simulations for the US Air Force. The idea was conceived and implemented by Edmond DeMattia at JHUAPL, and has been presented by Edmond and his colleague Michael Chinn at two VMworld conferences. We now have a white […]

GPGPU Computing with the nVidia K80 on VMware vSphere 6

As customer interest in running HPC workloads on vSphere continues to increase, I’ve been receiving more questions about whether compute accelerators like the nVidia K80 or Intel Xeon Phi can be used with vSphere VMs.   The answer is that while VMware supports the VM Direct Path I/O feature (i.e., passthrough mode) that allows PCI […]

VMware at Supercomputing 2015

SC ’15, the big, annual High Performance Computing (‘HPC’) conference, officially kicks off in Austin this evening with a gala opening of the conference exhibits. As we did last year, VMware has a demo booth within the EMC booth (#499) on the show floor. When I mentioned this to a customer recently, he cleverly asked […]

Using nVidia GPGPU Compute Acceleration with ESX 6.0

As was mentioned in a previous blog post, accelerator cards are becoming increasingly common in HPC environments and so it is important that we assess the performance of such cards with ESX. Thank you very much to Na Zhang for all of her work on the following. In this post, we share the results of […]

Research and High Performance Computing at VMworld US

There will be a High Performance Computing in Research and Data Analytics Roundtable session held on Monday evening in conjunction with VMworld US in San Francisco. This session is a part of the Government & Education Roundtable Series and is intended primarily for those customers. Seating is limited and registration is required. Registration is here. […]

Using the Intel Xeon Phi Compute Accelerator with ESX 6.0

Compute accelerators  — whether they be GPUs, Intel Xeon Phi, or FPGAs — are increasingly common in HPC and so it is important that we assess the use of such technologies from within VMware vSphere® as part of our efforts to virtualize research computing and other HPC environments. Last year when I tested Intel Xeon […]

Running HPC Applications on vSphere using InfiniBand RDMA

Looking back on 2014, this was the year in which we made significant strides in assessing and addressing High Performance Computing (HPC) performance on vSphere. We’ve shown that throughput or task-parallel applications can be run  with only small or negligible performance degradations (usually well under 5%) when virtualized — a fact that the HPC community […]

SC’14 in New Orleans: After-Action Report

Our first official presence at Supercomputing this week — SC’14 in New Orleans — was very gratifying. We had almost a dozen pre-scheduled meetings with customers and partners, and had what seemed like a steady stream of visitors at our demo station within the EMC booth on the exhibit floor. We also had a demo station […]

Supercomputing ’14 Begins: Laissez les bon temps rouler!

  SC’14, the big, annual High Performance Computing (HPC) conference officially kicks off in New Orleans this evening with the opening of the exhibits. Workshops and tutorials have been held over the weekend as well: I gave a keynote presentation on Sunday at the 4th International Workshop on Network-aware Data Management (NDM’14), titled RDMA in […]