Posts Tagged ‘ low-latency ’

joshsimons

Virtualized High Performance Computing (HPC) at VMworld 2013

August 19, 2013
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It’s been a busy few months on the HPC front here at VMware. I’ve been spending increasing amounts of time answering questions from our field people and talking with customers about the benefits of using virtualization and cloud technologies for HPC workloads. The two hottest application areas are clearly Life Sciences and Electronic Design Automation (EDA), with Financial Services as a third area where serious interest is starting to ramp. Customers in these sectors are actively evaluating or deploying HPC solutions based on VMware technology. Some of this work will be presented at VMworld 2013 August 25-29 in San Francisco. Here are the talks that will be of special interest to organizations whose job mixes include the technical, scientific or engineering...

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joshsimons

Paravirtual RDMA for Low Latency and Flexibility

December 27, 2012
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The Office of the CTO has been exploring how to best enable application access to RDMA for those applications requiring the ultimate in high bandwidth, low-latency communication, which includes many HPC MPI applications as well as many scale-out databases and BigData approaches. Passthrough mode is the most straightforward way to enable guest-level RDMA. With passthrough (which we call VM DirectPath I/O), a physical PCI device can be made directly visible to the guest operating system running within the virtual machine. We published a research note showing that this approach delivers very good InfiniBand latencies (under 2us) and excellent bandwidths over a wide range of message sizes. There is a downside, however: Punching through the virtual machine abstraction in this way disables several...

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Bhavesh Davda

Summer of vRDMA

August 10, 2012
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Last summer, Josh Simons wrote a blog entry titled Summer of RDMA , summarizing work done by our intern,  Adit Ranadive , who looked at RDMA performance on ESXi using VM DirectPath I/O with QDR InfiniBand cards passed through to VMs. At the same time, I had been exploring how to exploit RDMA for accelerating ESXi hypervisor services like vMotion, and some ideas around how to enable RDMA within a guest while still maintaining the ability to vMotion such VMs. In March 2012, Josh Simons and I delivered a talk about RDMA on vSphere: Status and Future Directions . In the talk, I discussed several different altenatives to expose...

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Bhavesh Davda

Tuning tips to run low-latency applications in virtual machines

October 14, 2011
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First off, a little bit about myself. I’m Bhavesh Davda, presently a member of the Office of the CTO here at VMware, looking at areas like low latency applications, high rate packet processing, high performance computing, SR-IOV and RDMA, which have historically been challenging to virtualize. Until recently, I managed the vSphere Networking R&D team within VMware, where my team worked on the entire virtual networking stack from guest OS drivers for paravirtual NICs, to virtualization of paravirtual and emulated NICs in the hypervisor, to efficiently implementing I/O down to the physical NIC drivers and our own TCP/IP stack in the vmkernel hypervisor for uses like VMotion, Fault-Tolerance and NFS at the hypervisor level. For the longest time, it was unusual to hear the...

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