Abstract
We present the porting to heterogeneous architectures of the algorithm used for applying linear transformations of raw energy deposits in the CMS High Granularity Calorimeter (HGCAL). This is the first heterogeneous algorithm to be fully integrated with HGCAL’s reconstruction chain. After introducing the latter and giving a brief description of the structural components of HGCAL relevant for this work, the role of the linear transformations in the calibration is reviewed. The many ways in which parallelization is achieved are described, and the successful validation of the heterogeneous algorithm is covered. Detailed performance measurements are presented, including throughput and execution time for both CPU and GPU algorithms, therefore establishing the corresponding speedup. We finally discuss the interplay between this work and the porting of other algorithms in the existing reconstruction chain, as well as integrating algorithms previously ported but not yet integrated.
Highlights
The operation of the High Luminosity LHC (HL-LHC) is expected to commence in 2027, achieving instantaneous luminosities of ∼5 × 1034 cm2 s−1, more than two times LHC’s current value
In this paper we describe the first heterogeneous implementation, fully compatible with the CMS software (CMSSW) [5, 6], of one of High Granularity Calorimeter (HGCAL)’s reconstruction stages, namely the rescaling of energy deposits
After the first stages described in [4], one obtains UncalibRecHits. They represent energy deposits whose amplitude is expressed in terms of the average number of minimum ionizing particles (MIPs), after being converted from analog-todigital converter (ADC) counts by the previous Digi step, and taking the sensor thickness into account
Summary
The operation of the High Luminosity LHC (HL-LHC) is expected to commence in 2027, achieving instantaneous luminosities of ∼5 × 1034 cm s−1, more than two times LHC’s current value. The goals of the HL-LHC include measuring the Higgs boson (self) couplings, vector boson fusion and vector boson scattering processes ( involving the Higgs boson), and B physics processes, among others [1] In accordance with this programme, the upgrade of the CMS detector [2] foresees a High Granularity Calorimeter (HGCAL) [3] to replace the current endcap calorimeters. Its adoption would allow access to accelerators, which become more and more present on High-Performance Computing and traditional grid sites. It would be in line with the direction taken by CMS to adopt a heterogeneous HLT farm already in Run 3.
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