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Accelerating Twisted Mass LQCD with QPhiX

We present the implementation of twisted mass fermion operators for the QPhiX library. We analyze the performance on the Intel Xeon Phi (Knights Corner) coprocessor as well as on Intel Xeon Haswell CPUs. In particular, we demonstrate that on the Xeon Phi 7120P the Dslash kernel is able to reach 80\% of the theoretical peak bandwidth, while on a Xeon Haswell E5-2630 CPU our generated code for the Dslash operator with AVX2 instructions outperforms the corresponding implementation in the tmLQCD library by a factor of $\sim 5\times$ in single precision. We strong scale the code up to 6.8 (14.1) Tflops in single (half) precision on 64 Xeon Haswell CPUs.

preprint2015arXivOpen access
Mario SchröckSilvano SimulaAlexei Strelchenko
hep-lat
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Open access3 authors1 topic
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Mario SchröckSilvano SimulaAlexei Strelchenko

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