Dynamical HISQ - University of Glasgow

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RHMC improvements There are a tool kits of faster algorithms Higher order integrators (Omelyan ). In MILC code. n-th root trick. detM =| detM 1/n | n = ∏ nj=1 ∫ Dφ † Dφe −φ† j M −1/n φ j Mass preconditioning Chris Richards (Liverpool) used the above algorithms (implemented by Clark) to get a 30% to 50% speed up with Asqtad, but needed ∼ 4 months of tuning (Lots of parameters and tradeoffs). Dynamical HISQ – p. 8
MILC plans Email from Doug Toussaint. Not started production running, but deciding this month what they want to do with HISQ (SCIDAC deadline). Alexei and Doug seeing some issues. Large jumps in the force when a first-level smeared matrix is small or when the phase of a unitarized matrix jumps. Note/email to follow. Mass dependent Naik term means additional pseudo-fermion fields are needed (Doug). Dynamical HISQ – p. 9
Page 1 and 2: Dynamical HISQ Craig McNeile c.mcne
Page 3 and 4: Why do dynamical HISQ? From science
Page 5 and 6: HISQ optimization Ron is a PI for a
Page 7: RHMC detM α = ∫ Dφ † Dφe −
Page 11 and 12: Level3 in practise Level3 code insi
Page 13 and 14: Profiling (Woloshyn and Wong) 100 (
Page 15 and 16: Introduction to Iwasaki action Perh
Page 17 and 18: The calculation Iwasaki looked at e

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