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On the effect of using rCUDA to provide CUDA acceleration to Xen virtual machines

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Abstract

Nowadays, many data centers use virtual machines (VMs) in order to achieve a more efficient use of hardware resources. The use of VMs provides a reduction in equipment and maintenance expenses as well as a lower electricity consumption. Nevertheless, current virtualization solutions, such as Xen, do not easily provide graphics processing units (GPUs) to applications running in the virtualized domain with the flexibility usually required in data centers (i.e., managing virtual GPU instances and concurrently sharing them among several VMs). Therefore, the execution of GPU-accelerated applications within VMs is hindered by this lack of flexibility. In this regard, remote GPU virtualization solutions may address this concern. In this paper we analyze the use of the remote GPU virtualization mechanism to accelerate scientific applications running inside Xen VMs. We conduct our study with six different applications, namely CUDA-MEME, CUDASW++, GPU-BLAST, LAMMPS, a triangle count application, referred to as TRICO, and a synthetic benchmark used to emulate different application behaviors. Our experiments show that the use of remote GPU virtualization is a feasible approach to address the current concerns of sharing GPUs among several VMs, featuring a very low overhead if an InfiniBand fabric is already present in the cluster.

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Notes

  1. 1.

    CUDA (compute unified device architecture) is a technology created by NVIDIA which comprises a parallel compute platform (CUDA-enabled graphics processing units) as well as an application programming interface (API) and a compiler.

  2. 2.

    In addition to the GRID K1 GPU, NVIDIA has also brought to market the GRID K2 model, which features 1536 CUDA cores per GPU and 4 GB of memory. However, this amount of resources per GPU is still noticeable smaller than the ones available in current NVIDIA Tesla K20 and K40 GPUs, featuring, respectively, 2496 and 2880 CUDA cores and 5GB and 12GB of memory. Therefore, using the GRID K2 device for providing acceleration to scientific applications instead of providing desktop virtualization would deliver a significantly lower performance than current mainstream GPUs used in HPC servers, such as the K20 or K40 GPUs.

  3. 3.

    KVMGT is the open source implementation of Intel’s GPU Virtualization Technology for KVM VMs.

  4. 4.

    In order to interact with the virtualized GPU, some kind of interface is required so that the application can access the virtual device. This interface could be placed at different levels. For instance, it could be placed at the driver level. However, GPU drivers usually employ low-level protocols which, additionally, are proprietary and strictly closed by GPU vendors. Therefore, a higher-level boundary must be used. This is why the GPU API is commonly selected for placing the virtualization boundary, given that these APIs are public.

  5. 5.

    The native domain refers to a scenario where virtualization is not used, that is, a real computer is leveraged. On the other hand, the virtual domain refers to the virtual machine.

  6. 6.

    In this work, we will refer to main memory as host memory or just host, while GPU memory will be referred as device memory or simply device, according to the well-established usage defined in the CUDA ecosystem.

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Acknowledgements

This work was funded by the Generalitat Valenciana under Grant PROMETEO/2017/077. Authors are also grateful for the generous support provided by Mellanox Technologies Inc.

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Correspondence to Javier Prades.

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Prades, J., Reaño, C. & Silla, F. On the effect of using rCUDA to provide CUDA acceleration to Xen virtual machines. Cluster Comput 22, 185–204 (2019). https://doi.org/10.1007/s10586-018-2845-0

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Keywords

  • Virtualization
  • CUDA
  • Xen
  • InfiniBand
  • HPC
  • Performance