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Gem5v: a modified gem5 for simulating virtualized systems

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Abstract

Virtualization is growing in different areas: from powerful servers in data centers to students’ laptops and even cell phones. It can provide a more efficient use of hardware resources. Virtualization enables multiple virtual machines to run side-by-side in an isolated environment on a physical hardware. Modern processors are enhanced with technologies like Intel-VT and AMD-V that speed up virtual machines. However, there is still room for improving support of hardware for virtualization workloads. Gem5 is an open-source full system simulator capable of simulating a Chip-Multiprocessor with its caches, interconnection network, memory controllers among others. In its current state, gem5 does not support virtualized workloads. In this paper, we present a modified version of gem5, named gem5v, that simulates the behavior of a virtualization layer and can simulate virtual machines. We test this simulator in different scenarios using Parsec, Splash, MapReduce (Phoenix), SPEC and EEMBC benchmarks and compare its measured runtime with real systems. Results show 1–9 % difference between the simulated system and two virtualization softwares on a real hardware, namely KVM and VMware ESX. The comparison of vCPU overhead in VMware ESX and gem5v shows between 0.1 and 9 % difference.

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Notes

  1. POSIX threads.

  2. We would like to submit it to the review board of gem5 so it could be part of the mainline.

  3. Located in configs/example.

  4. As we do not have a license for Simics, we are unable to do tests for comparison of Virtual-GEMS and gem5v.

  5. That is why we have used the \(@\) notation.

  6. According to Table 4, d in ffd means dedup.

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Acknowledgments

This research was in part supported by a Grant from IPM (No. CS1393-4-17).

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Authors and Affiliations

  1. School of ECE, University of Tehran, Tehran, Iran

    Seyed Hossein Nikounia & Siamak Mohammadi

  2. School of Computer Science, Institute for Research in Fundamental Science (IPM), Tehran, Iran

    Siamak Mohammadi

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  1. Seyed Hossein Nikounia
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  2. Siamak Mohammadi
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Correspondence to Siamak Mohammadi.

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Nikounia, S.H., Mohammadi, S. Gem5v: a modified gem5 for simulating virtualized systems. J Supercomput 71, 1484–1504 (2015). https://doi.org/10.1007/s11227-014-1375-7

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  • DOI: https://doi.org/10.1007/s11227-014-1375-7

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